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BEGIN:VEVENT
SUMMARY:Lorenzo Magnea - Differential equations for parametrised Feynman i
ntegrals
DTSTART;VALUE=DATE-TIME:20230531T073000Z
DTEND;VALUE=DATE-TIME:20230531T080000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2367@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Lorenzo Magnea (University of Torino)\nFollowing up
on some distant and little-known papers by Tullio Regge and collaborators\
, I will present an approach to integration-by-parts identities and differ
ential equations for Feynman integrals\, based on the Feynman parameter re
presentation\, and relying upon the projective nature of parameter integra
nds. A very general identity connecting projective forms allows to move ac
ross families of Feynman integrals\, unifying IBP identities and dimension
al shifts\, and feeding into systems of differential equations\, similar b
ut not identical to the conventional ones. I will illustrate the results w
ith simple examples at one and two loops.\n\nhttps://indico.ph.ed.ac.uk/ev
ent/118/contributions/2367/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2367/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calum Milloy - Regge poles and Regge cuts in multi-leg QCD amplitu
des
DTSTART;VALUE=DATE-TIME:20230601T130000Z
DTEND;VALUE=DATE-TIME:20230601T133000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2397@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Calum Milloy (University of Turin)\nScattering ampli
tudes greatly simplify in the Regge limit\, and yet exhibit a very interes
ting structure\, which is far richer in the full gauge theory than in the
planar limit. Prior to the development of QCD\, Regge and others showed th
at the asymptotic high-energy behaviour of amplitudes is governed by poles
and cuts in the complex angular momentum plane. It was also shown (Mandel
stam\, 1963) that Regge cuts emerge from non-planar diagrams. Here we expl
ore the separation between Regge poles and cuts in perturbative QCD using
rapidity evolution equations. We study Regge-pole factorisation in 2 \\to
n gauge theory amplitudes in multi-Regge kinematics\, whose parameters\, t
he impact factors\, the trajectory and the Lipatov vertex\, can be fully d
etermined from 2 \\to 2 and 2 \\to 3 amplitudes. The factorisation is brok
en at Next-to-Next-to-Leading-Logarithmic (NNLL) accuracy by the appearanc
e of a Regge cut owing to multiple Reggeon exchange in the $t$ channel. We
compute the multiple Reggeon exchange contributions through four loops an
d show how to define the NNLL Regge-pole parameters in the presence of a R
egge cut\, maintaining the non-planar nature of the cut as well as the uni
versality of the Regge pole parameters. Remarkably\, this separation betwe
en pole and cuts directly leads to the generalization of the Korchemsky-Ko
rchemskaya relation between the singularities of the gluon Regge trajector
y and the cusp anomalous dimension to three loops.\n\nhttps://indico.ph.ed
.ac.uk/event/118/contributions/2397/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2397/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Federico Gasparotto - Lattice Correlation functions from different
ial equations
DTSTART;VALUE=DATE-TIME:20230529T150000Z
DTEND;VALUE=DATE-TIME:20230529T153000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2329@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Federico Gasparotto (JGU Mainz)\nWe will discuss how
methods developed in the context of perturbation theory can be applied to
the computation of lattice correlation functions\, in particular in the n
on-perturbative regime. The techniques we will consider are integration-by
-parts identities and the method of differential equations\, cast in the f
ramework of twisted Co-Homology. We will report on calculations of correla
tion functions for phi^4 theory and lattices of small size\, both in Eucli
dean and Minkowskian signature.\n\nhttps://indico.ph.ed.ac.uk/event/118/co
ntributions/2329/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2329/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Federica Devoto - Mixed QCD-electroweak corrections to dilepton pr
oduction at the LHC in the high invariant mass region
DTSTART;VALUE=DATE-TIME:20230530T170000Z
DTEND;VALUE=DATE-TIME:20230530T173000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2364@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Federica Devoto (University of Oxford)\nIn this talk
\, I will present a calculation of the NNLO mixed QCD-EW corrections to th
e neutral-current Drell-Yan production of a pair of massless leptons in th
e high invariant-mass region. Our computation is fully differential with r
espect to the final state particles.\nWe find that the mixed corrections c
orrections are larger than what one would expect based on the magnitude of
the coupling constants\, and they can exceed the pure NNLO QCD contributi
on in a large portion of the phase space. At relatively low values of the
dilepton invariant mass\, mll \\sim 200 GeV\, we find unexpectedly large m
ixed QCD-electroweak corrections at the level of -1%. In the TeV region\,
we observe that these corrections can be well approximated by the product
of QCD and electroweak corrections\, as expected from Sudakov factorisatio
n.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2364/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2364/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastian Jaskiewicz - High-Energy and Soft-Collinear Resummation
for Jet Production at the LHC
DTSTART;VALUE=DATE-TIME:20230601T153000Z
DTEND;VALUE=DATE-TIME:20230601T160000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2401@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Sebastian Jaskiewicz (Durham University IPPP)\nIn th
is talk I will present the method to merge the resummation of high energy
logarithms implemented in High Energy Jets (HEJ) partonic Monte Carlo fram
ework with the soft-collinear effects described by the Pythia parton showe
r. The method preserves the accuracy of the leading order cross sections a
nd the logarithmic accuracy of both resummation schemes across all of phas
e space. I will show predictions obtained within this framework and compar
e to data from experimental studies.\n\nhttps://indico.ph.ed.ac.uk/event/1
18/contributions/2401/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2401/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Martin Beneke - Gradient flow renormalon subtraction and the hadro
nic tau decay series
DTSTART;VALUE=DATE-TIME:20230531T100000Z
DTEND;VALUE=DATE-TIME:20230531T103000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2371@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Martin Beneke (Technische Universität München)\nWe
subtract the gluon-condensate renormalon singularity in the Adler functio
n\, which causes the discrepancy between fixed-order (FOPT) and contour-im
proved perturbation theory (CIPT)\, employing the gradient flow action den
sity. The scheme leads to automatic subtraction\, does not require knowled
ge of the Stokes constant (renormalon residue)\, and relates to a non-pert
urbatively defined cut-off gluon condensate. Unlike unsubtracted perturbat
ion theory\, FOPT and CIPT give consistent results for the inclusive hadro
nic tau decay width\, removing a major uncertainty in the determination of
the strong coupling from tau decay.\n\nhttps://indico.ph.ed.ac.uk/event/1
18/contributions/2371/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2371/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aparna Sankar - Next-to-soft resummation for colour singlet proces
ses at the LHC
DTSTART;VALUE=DATE-TIME:20230601T083000Z
DTEND;VALUE=DATE-TIME:20230601T090000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2392@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Aparna Sankar (Technical University of Munich\, Depa
rtment of Physics)\nIn this talk\, I will discuss a framework that resums
soft (logarithms ln^k(N) in Mellin space) and next-to-soft (power-suppress
ed terms ln^k(N)/N in Mellin space) logarithms to all orders in perturbati
ve QCD. We use the concepts of collinear factorisation and renormalisation
group invariance to achieve this. The former allows one to define a soft-
collinear (SC) function that encapsulates soft and collinear dynamics of t
he perturbative results to all orders in the strong coupling constant. The
logarithmic structure of these results is governed by universal infrared
anomalous dimensions and process-dependent functions of the Sudakov differ
ential equation that the SC satisfies. The solution to the differential eq
uation is obtained by proposing an all-order ansatz in dimensional regular
ization\, owing to several state-of-the-art perturbative results available
to third order. Using this framework we study the numerical impact of res
umming the NSV logarithms in the context of Drell-Yan and Higgs boson prod
uction processes at the LHC to next-to-next-to leading logarithmic (NNLL)
accuracy. The talk is based on the works : Eur.Phys.J.C 82 (2022) 3\, 234\
, Eur.Phys.J.C 82 (2022) 9\, 774 \, Phys.Rev.D 106 (2022) 3\, 034005\, hep
-ph/2205.11560.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2392
/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2392/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Julia Karlen - Locally finite two-loop amplitudes for multiple Hig
gs boson production in gluon fusion
DTSTART;VALUE=DATE-TIME:20230529T130000Z
DTEND;VALUE=DATE-TIME:20230529T133000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2317@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Julia Karlen (ETH Zurich)\nIn this talk I will descr
ibe the construction of local infrared counterterms to remove all infrared
singularities in two-loop amplitudes for gluon-fusion processes to colour
less final states. The counterterms are given as form-factor integrands wh
ose integrals are known and the number of such counterterms are very small
compared to the number of diagrams involved. This procedure is based on t
he universality of infrared singularities. Removing ultraviolet counterter
ms results in a locally finite amplitude\, which admits numerical integrat
ion in momentum space.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributio
ns/2317/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2317/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Silvia Ferrario Ravasio - Pushing the accuracy of parton showers f
or hadron colliders
DTSTART;VALUE=DATE-TIME:20230602T103000Z
DTEND;VALUE=DATE-TIME:20230602T110000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2411@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Silvia Ferrario Ravasio (CERN)\nShower Monte Carlo g
enerators simulate fully realistic collider events\, and reproduce much of
the data from the LHC and its predecessors. Their core is represented by
Parton Shower~(PS) algorithms\, which provide the inclusion of soft radiat
ion and enable us to mimic a realistic high-multiplicity collider event. T
he flexibility of these tools comes at a cost of a lower accuracy\, which
can lead to large systematic uncertainties and compromise the physics pote
ntial of the LHC and future colliders. In this talk I will discuss the cri
teria introduced by the PanScales collaboration to assess the logarithmic
accuracy of PS's. I will also show new results for the PanScales dipole sh
owers\, which represent the first family of dipole showers with demonstrat
ed NLL accuracy for Drell-Yan and gluon-fusion production at hadron collid
ers.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2411/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2411/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Ruf - Classical scattering at high orders in perturbation
theory
DTSTART;VALUE=DATE-TIME:20230601T180000Z
DTEND;VALUE=DATE-TIME:20230601T183000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2405@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Michael Ruf (UCLA)\nThe gravitation binary problem a
nd the associated production of gravitational waves can be treated efficie
ntly within the framework of quantum field theory. This allows to make use
of a variety of tools ranging from double copy relations between gauge th
eory and gravity to methods from effective field theory and multi-loop int
egration. I will show recent progress in applying this approach to state-o
f-the art problems in classical perturbation theory and will highlight the
fruitful interplay with other more traditional approaches to the binary p
roblem.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2405/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2405/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrzej Czarnecki - Radiative corrections to mechanical properties
of bound states
DTSTART;VALUE=DATE-TIME:20230601T170000Z
DTEND;VALUE=DATE-TIME:20230601T173000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2403@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andrzej Czarnecki (University of Alberta)\nThis talk
will present radiative corrections and their interpretation for the so-ca
lled D-term. This is related to the Electron-Ion Collider project\, where
Generalized Parton Distributions (GPD) will be measured. GPD give access t
o matrix elements of the energy-momentum tensor of a nucleon. The D-term i
s sometimes roughly interpreted as characterizing pressure distribution. C
alculated it in simple bound states such as the hydrogen atom it exhibits
an interesting new type of a log correction that resembles the Lamb shift
but has a different physical interpretation.\n\nhttps://indico.ph.ed.ac.uk
/event/118/contributions/2403/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Fucilla - High-energy resummation in Higgs production at n
ext-to-leading order
DTSTART;VALUE=DATE-TIME:20230601T100000Z
DTEND;VALUE=DATE-TIME:20230601T103000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2400@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Michael Fucilla (Università della calabria)\nPrecis
ion physics in the Higgs sector has been one of the main challenges in rec
ent years. The pure fixed-order calculations entering in the \\textit{coll
inear factorization} framework\, which have been pushed up to N3LO\, are n
ot able to describe the entire kinematic spectrum. In particular condition
s\, they must be necessarily supplemented by all-order \\textit{resummatio
ns}\; for instance\, in the so called \\textit{Regge} kinematical region\,
large energy-type logarithms spoil the perturbative behavior of the serie
s and must be resummed to all orders. This resummation is necessary to des
cribe the inclusive hadroproduction of a forward Higgs in the limit of sma
ll Bjorken $x$\, as well to study inclusive forward emissions of a Higgs b
oson in association with a backward identified object. A complete resummat
ion for these processes\, at next-to-leading logarithmic accuracy (NLLA)\,
can be achived through the Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach\
, but it requires the knowledge of the next-to-leading order Higgs impact
factor. We present the full NLO result for the impact factor of a forward
Higgs boson\, obtained in the infinite top-mass limit\, both in the moment
um representation and as superposition of the eigenfunctions of the LO BFK
L kernel. We also discuss the application of the result to the inclusive h
adroproduction of a Higgs boson in association with a jet.\n\nhttps://indi
co.ph.ed.ac.uk/event/118/contributions/2400/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2400/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreas Maier - High-energy resummation for Higgs boson plus jets
production
DTSTART;VALUE=DATE-TIME:20230601T140000Z
DTEND;VALUE=DATE-TIME:20230601T143000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2399@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andreas Maier (DESY)\nAt high energies\, fixed-order
predictions for the production of a Higgs boson together with one or more
jets suffer from large logarithms in invariant masses over transverse mom
enta. We resum these high-energy logarithms to all orders within the High
Energy Jets (HEJ) framework\, retaining the exact dependence on the top-qu
ark mass. We compare our predictions to ATLAS and CMS measurements at 8 an
d 13 TeV.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2399/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2399/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jeppe Andersen - Next-to-leading high energy logarithmic correctio
ns and their impact on ratios of jet multiplicities
DTSTART;VALUE=DATE-TIME:20230601T133000Z
DTEND;VALUE=DATE-TIME:20230601T140000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2398@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Jeppe Andersen (IPPP\, Univ. of Durham)\nWe present
high energy next-to-leading logarithmic corrections\, their inclusion with
in the framework of High Energy Jets\, and their impact on the stabilisati
on of the perturbative prediction of R32 for large rapidity separations.\n
\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2398/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2398/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Philipp Böer - $B_c \\to \\eta_c$ Form Factors in the Double-Loga
rithmic Approximation
DTSTART;VALUE=DATE-TIME:20230601T103000Z
DTEND;VALUE=DATE-TIME:20230601T110000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2395@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Philipp Böer (University of Mainz)\nUsing diagramma
tic resummation techniques\, I discuss the double logarithmic series of B_
c to eta_c form factors at large hadronic recoil. In the non-relativistic
limit\, mb >> mc >> LambdaQCD\, this process provides one of the simplest
setups to study the problem of endpoint singularities appearing in the SCE
T factorization of exclusive B decay amplitudes in a perturbative framewor
k. The leading double logarithms arise from a peculiar interplay of energy
-ordered ladder diagrams -- for which an RGE treatment using effective The
ories is currently unknown -- as well as Standard Sudakov-type corrections
.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2395/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2395/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jonathan Gaunt - Two-loop splitting in double parton distributions
DTSTART;VALUE=DATE-TIME:20230601T090000Z
DTEND;VALUE=DATE-TIME:20230601T093000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2393@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Jonathan Gaunt (University of Manchester)\nDouble pa
rton scattering (DPS) is the process in which one has two hard scatterings
in an individual proton-proton collision. It can compete in rate with sin
gle scattering in certain kinematic regions and/or for certain processes\,
and reveals information on nucleon structure not accessible in single par
ton scattering: spatial\, spin\, and colour correlations between the parto
ns inside the nucleon. The parton densities relevant to DPS are the double
parton distributions (DPDs)\; at small distance between the two probed pa
rtons the DPDs can be computed in perturbation theory. I discuss this pert
urbative calculation at next-to-leading order – this is the key missing
piece required for computations of DPS at NLO. The calculation for both th
e colour-singlet and colour-correlated DPDs will be covered – in the lat
ter case\, one encounters rapidity divergences\, the treatment of which I
will discuss in detail. We used two different regulator schemes\, the δ r
egulator and Collins' regulator using space-like Wilson lines\, and obtain
ed identical results in both\, providing a strong cross-check. To our know
ledge this is the first application of the Collins regulator in a two-loop
calculation.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2393/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2393/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pia Bredt - A generic NLO SM framework for LHC and future collider
processes
DTSTART;VALUE=DATE-TIME:20230601T080000Z
DTEND;VALUE=DATE-TIME:20230601T083000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2391@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Pia Bredt (University of Siegen)\nIn this talk I wil
l present an automated framework calculating NLO corrections in the full S
M for arbitrary processes at hadron and lepton colliders. This framework i
s an element of the Monte-Carlo program WHIZARD simulating cross sections
and differential distributions. The generalization of the implemented FKS
scheme to systematically subtract QED and QCD infrared divergences in mixe
d coupling expansions will be discussed. Also\, recent progress of the POW
HEG-matched event generation and the inclusion of electroweak corrections
in future lepton collider processes are subjects of this talk. In particul
ar\, results of our recent study will be shown applying EW corrections to
multi-boson processes at a future multi-TeV muon collider.\n\nhttps://indi
co.ph.ed.ac.uk/event/118/contributions/2391/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2391/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dhimiter Canko - Two-Loop Amplitude Reduction using HELAC
DTSTART;VALUE=DATE-TIME:20230601T073000Z
DTEND;VALUE=DATE-TIME:20230601T080000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2390@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Dhimiter Canko (NSCR "Demokritos")\nWe present an ex
tension of HELAC for two-loop amplitudes. All basic two-loop topologies (T
heta\, Infinity\, Dumbbell) are included in the skeleton construction. For
colored particles\, the color-connection representation is extended to tw
o loops offering a unified framework for tree-order\, one- and two-loop am
plitudes. HELAC-2LOOP provides\, at the moment\, an automated algorithm ca
pable to compute two-loop amplitudes at the integrand level. Several tests
have been performed regarding 2-to-2 and 2-to-3 processes against publica
lly available packages such as QGRAF\, FeynArts\, FeynCalc\, and FORM. The
reduction to a master integral basis is currently under study.\n\nhttps:/
/indico.ph.ed.ac.uk/event/118/contributions/2390/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2390/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Boris Kopeliovich - Abundant radiation of soft photons: a puzzle l
asting 40 years
DTSTART;VALUE=DATE-TIME:20230601T173000Z
DTEND;VALUE=DATE-TIME:20230601T180000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2388@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Boris Kopeliovich (UTFSM\, Valparaiso)\nThe anomalou
s excess of soft photons radiated in inelastic hadronic collisions\, has b
een challenging the physics community over four decades\, but no solution
was proposed so far. We argue that the problem is rooted in comparison wit
h an incorrect model for radiative corrections\, usually called bremsstrah
lung model. It is based on an illegitimate extension of the Low theorem to
radiative multi-particle production processes 2 → n + γ. We demonstrat
e that this breaks down unitarity of the S-matrix in contradiction with th
e optical theorem. We propose an alternative description of photon radiati
on within the light-front color-dipole phenomenology. The results of calcu
lations are in a good accord with available data.\n\nhttps://indico.ph.ed.
ac.uk/event/118/contributions/2388/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2388/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oscar Braun-White - A general algorithm to build real-radiation an
tenna functions for higher-order calculations
DTSTART;VALUE=DATE-TIME:20230601T170000Z
DTEND;VALUE=DATE-TIME:20230601T173000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2387@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Oscar Braun-White (IPPP Durham University)\nThe ante
nna subtraction method has been successfully applied to a wide range of pr
ocesses relevant for the Large Hadron Collider at next-to-next-to-leading
order in $\\alpha_s$ (NNLO). We propose an algorithm for building antenna
functions for any number of real emissions directly out of the unresolved
limits we require. Antenna functions of this kind always identify two hard
radiators. We then use the algorithm to explicitly build all single- and
double-real QCD antenna functions and compare them to the previous antenna
functions\, which were extracted from matrix elements. These antenna func
tions should be more easily applicable to NNLO subtraction terms than prev
iously. Finally\, we match the integration of the antenna functions over t
he final-final unresolved phase space to the previous incarnation\, servin
g as an independent check on our results.\n\nhttps://indico.ph.ed.ac.uk/ev
ent/118/contributions/2387/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2387/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yannick Ulrich - QED at NNLO and beyond for precision experiments
DTSTART;VALUE=DATE-TIME:20230601T153000Z
DTEND;VALUE=DATE-TIME:20230601T160000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2386@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Yannick Ulrich (University of Durham)\nLow-energy ex
periments allow for some of the most precise measurements in particle phys
ics\, such as g-2. To make the most of these experiments\, theory needs to
match the experimental precision. Over the last decade\, this meant that
even in QED next-to-next-to-leading order calculations (or even more in so
me cases) became necessary. I will discuss some of the challenges faced wh
en dealing with QED corrections and discuss some possible solutions that w
e have implemented in McMule (Monte Carlo for MUons and other LEptons). Mc
Mule is a framework that we have developed to obtain NNLO predictions for
a number of processes\, such as $e\\mu \\to e\\mu$\, $ee \\to ee$ and $\\m
u \\to e\\nu\\bar\\nu$.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributi
ons/2386/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2386/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marco Rocco - Muon-electron scattering at NNLO with McMule
DTSTART;VALUE=DATE-TIME:20230601T160000Z
DTEND;VALUE=DATE-TIME:20230601T163000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2385@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Marco Rocco (Paul Scherrer Institut)\nA recently pro
posed experiment\, MUonE\, aims to extract the hadronic vacuum polarisatio
n contribution to the muon g-2 from muon-electron scattering at low energy
. The extrapolation requires that both experimental and theoretical uncert
ainties do not exceed 10 ppm. This corresponds\, at least\, to next-to-nex
t-to leading order QED corrections to $e\\mu \\to e\\mu$. I will discuss t
he implementation of a Monte Carlo generator for this process in the McMul
e framework\, which provides infrared-safe differential results at said or
der in QED. An approximation of the MUonE setup provides some phenomenolog
ical results and sheds light on the need for higher-order corrections\, wh
ich are currently under study within McMule.\n\nhttps://indico.ph.ed.ac.uk
/event/118/contributions/2385/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2385/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Marcoli - N3LO Antenna Functions for Final-State Radiation
DTSTART;VALUE=DATE-TIME:20230601T140000Z
DTEND;VALUE=DATE-TIME:20230601T143000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2383@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Matteo Marcoli (University of Zurich)\nIn the past d
ecade the antenna subtraction method has been successfully implemented to
compute Next-to-Next-to-Leading Order (NNLO) corrections in QCD for a seri
es of relevant processes. In this talk we discuss the first steps towards
the extension of this method at Next-to-Next-to-Next-to-Leading Order (N3L
O). In particular\, the calculation of N3LO antenna functions for final st
ate radiation is presented\, where each configuration of hard radiators (q
uark-antiquark\, gluon-gluon\, quark-gluon) is suitably decomposed into pa
rtonic sub-processes. Unintegrated antenna functions are directly extracte
d from physical squared matrix elements\, while their integrated counterpa
rts are obtained relating inclusive phase space integrals to unitarity cut
s of massless four-loop integrals. We conclude commenting how the newly co
mputed antenna functions would fit in the context of a local N3LO subtract
ion scheme.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2383/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2383/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gloria Bertolotti - Subtracting NNLO singularities with a fully ge
neral analytic algorithm in massless QCD
DTSTART;VALUE=DATE-TIME:20230601T133000Z
DTEND;VALUE=DATE-TIME:20230601T140000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2382@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Gloria Bertolotti (University of Turin)\nThis talk p
resents the construction of the NNLO subtraction formula for the cancellat
ion of IR singularities obtained within the framework of Local Analytic Se
ctor Subtraction. Such general program has been (so far) completed for the
treatment of unresolved radiation in processes featuring any partonic fin
al state in massless QCD. The outcome of the subtraction is a compact and
analytic expression suitable for direct numerical implementation\, thus en
abling the production of relevant phenomenological results. Updated develo
pments on the extension to ISR at NNLO and the numerical implementation of
the scheme are discussed.\n\nhttps://indico.ph.ed.ac.uk/event/118/contrib
utions/2382/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2382/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leonardo Di Giustino - Elimination of QCD Renormalization Scale an
d Scheme Ambiguities
DTSTART;VALUE=DATE-TIME:20230601T110000Z
DTEND;VALUE=DATE-TIME:20230601T113000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2380@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Leonardo Di Giustino (Insubria and INFN)\nThe renorm
alization scale setting in QCD is a fundamental problem for high precision
tests of the Standard Model (SM). It is considered a conventional practic
e to set the renormalization scale to the typical scale of a process Q\, n
amely to the momentum transfer and to determine theoretical errors by vary
ing it in a range of two. According to the Conventional Scale Setting (C.S
.S.)\, perturbative QCD ( pQCD) predictions are affected by the renormaliz
ation scheme and scale ambiguities. The Principle of Maximum Conformality
(PMC) provides a systematic way to remove such ambiguities from perturbati
ve calculations satisfying at once the renormalization group invariance an
d the self-consistency conditions deriving from the renormalization group.
We present here the recent developments and applications of the PMC metho
d also showing the comparison of the results with those obtained with othe
r methods.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2380/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesco Giovanni Celiberto - NLL/NLO studies on Higgs-plus-jet p
roduction with POWHEG+JETHAD
DTSTART;VALUE=DATE-TIME:20230601T150000Z
DTEND;VALUE=DATE-TIME:20230601T153000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2378@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN
-TIFPA)\nRecent analyses on high-energy inclusive Higgs-boson rates in pro
ton collisions via the gluon fusion channel\, matched with the state of-th
e-art fixed-order N3LO accuracy\, have shown that the impact of high-energ
y resummation corrections reaches 10% at the FCC nominal energies. This su
pports the statement that electroweak physics at 100 TeV is expected to re
ceive relevant contributions from small-x physics. In this talk we will pr
esent novel predictions for transverse-momentum and rapidity distributions
sensitive the inclusive emission of a Higgs boson in association with a l
ight-flavored jet in proton collisions\, calculated within the NLL accurac
y of the energy-logarithmic resummation as implemented in the JETHAD code
and matched with NLO fixed-order computations from POWHEG. According to ou
r knowledge\, this represent a first and novel implementation of a matchin
g procedure in the context of the high-energy resummation for rapidity-sep
arated two-particle final states. We come out with the message that the im
provement of fixed-order calculations on Higgs-plus-jet QCD distributions
is a core ingredient to reach the precision level of the description of ob
servables relevant for the Higgs physics at current LHC energies as well a
s at nominal FCC ones.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributio
ns/2378/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2378/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Silvia Zanoli - Combining NNLO QCD and NLO EW corrections matched
to parton showers for WZ production using MiNNLOPS
DTSTART;VALUE=DATE-TIME:20230601T090000Z
DTEND;VALUE=DATE-TIME:20230601T093000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2377@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Silvia Zanoli (Max-Planck-Institut für Physik)\nIn
view of the increasing level of precision of current and future experiment
al measurements\, matching NNLO QCD and NLO EW corrections represents a cr
ucial step for LHC phenomenology. Furthermore\, complementing fixed-order
perturbative computations with parton-shower effects is indispensable for
a realistic description of LHC processes. In this talk we present the comp
utation of WZ production at NNLO QCD and NLO EW consistently matched to pa
rton showers using the MiNNLOPS method. We investigate different combinati
on schemes based on an a-posteriori recombination of QCD and EW contributi
ons\, showing that the inclusion of EW effects gives sizable effects. We a
lso comment on the possibility of extending the MiNNLOPS method towards th
e inclusion of NLO EW corrections avoiding an a-posteriori reweighting of
simulated events.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/23
77/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2377/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Peter Skands - NNLO Corrections in Sector Showers
DTSTART;VALUE=DATE-TIME:20230601T083000Z
DTEND;VALUE=DATE-TIME:20230601T090000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2376@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Peter Skands (Monash University)\nI will describe re
cent progress on sector showers that consistently incorporate second-order
"direct" 2->4 branchings. These showers are able to reproduce the full si
ngularity structure of QCD through NNLO and can be matched in a very natur
al and fully differential way to calculations at this accuracy\, provided
that consistent "Born-local" K-factors can be defined. The method appears
straightforward to extend to N3LO should that be desired in the future.\n\
nhttps://indico.ph.ed.ac.uk/event/118/contributions/2376/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2376/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ludovic Scyboz - Matching and parton-shower accuracy
DTSTART;VALUE=DATE-TIME:20230601T080000Z
DTEND;VALUE=DATE-TIME:20230601T083000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2375@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Ludovic Scyboz (University of Oxford)\nIn this talk
I investigate the interplay of NLO matching and next-to-leading-logarithmi
c (NLL) parton showers in the context of two-body decays. Three matching s
chemes have been implemented in the NLL-accurate PanScales showers: a mult
iplicative scheme\, MC@NLO and POWHEG. By means of both analytic and numer
ical arguments\, I show how these retain the shower’s NLL accuracy\, and
(under certain provisions in the case of POWHEG) can augment it so that i
t achieves NNDL accuracy for global event shapes. The talk will also brief
ly explore some phenomenological considerations.\n\nhttps://indico.ph.ed.a
c.uk/event/118/contributions/2375/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2375/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andre Hoang - Calibration of the MC top quark mass parameter with
variable parton shower cut-off
DTSTART;VALUE=DATE-TIME:20230601T073000Z
DTEND;VALUE=DATE-TIME:20230601T080000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2374@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andre Hoang (University of Vienna)\nIn a recent work
by Hoang\, Plätzer and Samitz is has been shown at the parton level that
the relation top quark mass in MC event generators to a well-defined reno
rmalization scheme depends on the parton shower cutoff. Still\, it has not
been known to which extent the hadronization model may affect this relati
on and how much this relation depends on the MC event generator and the NL
O matching scheme. Given the current uncertainties from direct measurement
s of well below 400 MeV this issue becomes increasingly important. In the
presentation the discussion is extended to the hadron level \, also showin
g new results based on a novel cluster hadronziation model in the Herwig e
vent generator. The results represent an important additional step towards
assigning a definite scheme to the MC top mass parameter.\n\nhttps://indi
co.ph.ed.ac.uk/event/118/contributions/2374/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2374/
END:VEVENT
BEGIN:VEVENT
SUMMARY:HuaXing Zhu - Power corrections to energy flow distribution meets
conformal bootstrap
DTSTART;VALUE=DATE-TIME:20230531T090000Z
DTEND;VALUE=DATE-TIME:20230531T093000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2370@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: HuaXing Zhu (Zhejiang University)\nDynamics of high
energy scattering in QCD are primarily probed through detector energy flow
correlations. One important IRC safe energy-flow observable is the Energy
-Energy Correlator (EEC). At leading power approximation in the back-to-ba
ck limit\, EEC enjoys a factorization formula similar to the Drell-Yan pro
duction at small transverse momentum. Therefor studying the power correcti
ons to EEC provides valuable insight to power corrections to Drell-Yan pro
duction. In this talk I will introduce a novel method to calculate power c
orrections to EEC by exploiting the power of conformal symmetry. I will sh
ow that there is a close correspondence between power corrections on one s
ide\, and twist and large spin perturbation in the operator product expans
ion of local correlator on the other side. I will demonstrate the method b
y computing the first NLP resummation for EEC.\n\nhttps://indico.ph.ed.ac.
uk/event/118/contributions/2370/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2370/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastian Mizera - Landau Singularities Revisited
DTSTART;VALUE=DATE-TIME:20230531T080000Z
DTEND;VALUE=DATE-TIME:20230531T083000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2368@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Sebastian Mizera (Perimeter Institute for Theoretica
l Physics)\nLandau analysis aims to predict the singularity structure of F
eynman integrals without their explicit evaluation. We point out a number
of errors in its textbook formulation that prevented applications to the S
tandard Model processes in the past. After resolving these issues\, we use
a combination of tropical analysis and numerical algebraic geometry to im
plement an algorithm that classifies and consistently finds all possible s
ingularities of multi-loop Feynman integrals.\n\nhttps://indico.ph.ed.ac.u
k/event/118/contributions/2368/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2368/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Pelloni - Four-loop large-nf contributions to the non-singl
et structure functions
DTSTART;VALUE=DATE-TIME:20230530T180000Z
DTEND;VALUE=DATE-TIME:20230530T183000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2366@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andrea Pelloni (Nikhef)\nWe have calculated the $n_f
^2$ and $n_f^3$ contributions to the flavour non-singlet structure functio
ns $F_2$ and $F_L$ and most recently $F_3$ in inclusive deep-inelastic sca
ttering at the fourth order in the strong coupling $\\alpha_s$. The coeffi
cient functions have been obtained by computing a very large number of Mel
lin-N moments using the method of differential equations\, and then determ
ining the analytic forms in N and Bjorken-x from these. Our new $n_f^2$ te
rms are numerically much larger than the n3f leading large-nf parts which
were already known\; they agree with predictions of the threshold and high
-energy resummations. Furthermore\, our calculation confirms the earlier d
etermination of the four-loop $n_f^2$ part of the corresponding anomalous
dimension.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2366/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2366/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yao Ma - A graph-theoretical approach to the method of regions
DTSTART;VALUE=DATE-TIME:20230530T160000Z
DTEND;VALUE=DATE-TIME:20230530T163000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2363@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Yao Ma (University of Edinburgh)\nThe method of regi
ons (MoR)\, a systematic way to compute Feynman integrals involving multip
le kinematic scales\, states that a Feynman integral can be approximated\,
and even reproduced\, by summing over integrals that are expanded in cert
ain regions. A modern perspective of the MoR is to consider any given Feyn
man integral as a certain Newton polytope\, which is defined as the convex
hull of the points associated to the terms of the Symanzik polynomials. T
he regions then\, has a one-to-one correspondence to the "lower facets" of
this polytope. Since the Symanzik polynomials are further related to the
spanning trees and spanning 2-trees of the Feynman graph\, a graph-theoret
ical study of these polynomials may allow us to unveil all the possible re
gions that are needed in the MoR. In this talk we mainly focus on three sp
ecific expansions of the wide-angle scattering process: the on-shell expan
sion\, threshold expansion and mass expansion. After introducing the backg
round knowledge\, we will describe the basic strategy of the grah-theoreti
cal approach\, and formulate the generic form of the regions appearing in
each of the three expansions above. The results\, which hold for graphs at
all orders\, can be further applied to construct graph-finding algorithms
for the MoR\, and investigate the properties of the Soft-Collinear Effect
ive Theory (SCET).\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2
363/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2363/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Piotr Bargiela - Three-loop four-particle QCD amplitudes
DTSTART;VALUE=DATE-TIME:20230530T153000Z
DTEND;VALUE=DATE-TIME:20230530T160000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2362@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Piotr Bargiela (University of Oxford)\nScattering am
plitudes are the fundamental building blocks of collider observables. Comp
aring high precision measurements with theory predictions requires computi
ng them to high perturbative order. The growth in the number of loops sign
ificantly increases the complexity of the problem. Using novel methods all
owed us to compute QCD corrections to four-point massless processes at the
state-of-the-art three-loop order. In this talk\, I will argue that emplo
ying a recently proposed projector method reduces the amount of independen
t Lorentz tensor structures. I will also discuss the derivation of a compl
ete set of Master Integrals in all the relevant physical regions. It is ba
sed on regularity properties of the underlying Feynman integrals\, which w
ere observed before. I will present our results for the diphoton productio
n in gluon fusion channel. Finally\, I will show an application of this am
plitude to LHC phenomenology. This particular process is a leading backgro
und for Higgs production in the discovery channel. Because of the interfer
ence with the signal\, it can put new bounds on the Higgs width.\n\nhttps:
//indico.ph.ed.ac.uk/event/118/contributions/2362/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2362/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ze Long Liu - Infrared singularities of QCD amplitudes with a mass
ive parton
DTSTART;VALUE=DATE-TIME:20230530T130000Z
DTEND;VALUE=DATE-TIME:20230530T133000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2358@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Zelong Liu (CERN)\nThe knowledge of infrared singula
rities of gauge-theory amplitudes enables us to systematically resum large
logarithmic corrections to many important observables. In this talk\, I w
ill present the structure of anomalous dimensions governing infrared singu
larities of QCD amplitudes with one massive and an arbitrary number of mas
sless external partons. The analytical expression of tripole correlations
involving one massive parton is obtained at three loops for the first time
. The results are essential to improve the theoretical predictions of sing
le top and top quark pair productions at hadron colliders.\n\nhttps://indi
co.ph.ed.ac.uk/event/118/contributions/2358/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2358/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zhewei Yin - Coupling versus kinematics in a general spontaneously
broken gauge theory
DTSTART;VALUE=DATE-TIME:20230530T110000Z
DTEND;VALUE=DATE-TIME:20230530T113000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2357@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Zhewei Yin (Uppsala University)\nThe most general re
normalizable quantum field theory one can write down for a finite spectrum
of spin-0\, 1/2\, and 1 particles is a gauge theory\, with possible spont
aneously broken symmetries. The existence of Lie group structures in such
a theory is determined by perturbative unitarity of the on-shell scatterin
g amplitudes. Armed with new tools developed for scattering amplitudes\, w
e demonstrate very explicitly how broken symmetries emerge from the constr
aints of tree unitarity. Such constraints result in relations dictating th
e couplings to be invariant tensors of the gauge group\, and each of these
relations has a counterpart for kinematic numerators of on-shell amplitud
es. This facilitates the extension of color-kinematics duality to spontane
ously broken gauge theories.\n\nhttps://indico.ph.ed.ac.uk/event/118/contr
ibutions/2357/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2357/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kay Schönwald - Singlet and anomaly contributions to massive QCD
form factors
DTSTART;VALUE=DATE-TIME:20230530T090000Z
DTEND;VALUE=DATE-TIME:20230530T093000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2354@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Kay Schönwald (University of Zurich)\nMassive form
factors in QCD are important building blocks in higher order corrections t
o various observables like heavy quark production\, top quark decays or mu
on-electron scattering\, where they describe the virtual contributions. Fu
rthermore\, they show universal infrared behaviour which makes them intere
sting to study also in the context of the infrared structure of QCD amplit
udes. In this talk I will present our recent calculation of singlet and an
omaly contributions to the massive quark form factors\, which is based on
expansions around singular and regular points of the master integrals and
numerical matching. This completes the calculation of the massive form fac
tors for external vector\, axial-vector\, scalar and pseudo-scalar current
s up to three-loop order.\n\nhttps://indico.ph.ed.ac.uk/event/118/contribu
tions/2354/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2354/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nikolaos Syrrakos - 3-loop master integrals for H+jet production a
t N3LO: Towards the non-planar topologies
DTSTART;VALUE=DATE-TIME:20230530T083000Z
DTEND;VALUE=DATE-TIME:20230530T090000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2353@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Nikolaos Syrrakos (TUM)\nI will discuss the recent p
rogress that has been made towards the computation of 3-loop non-planar ma
ster integrals relevant to N3LO corrections to processes such as H+jet pro
duction at the LHC. I will describe the analytic structure of these integr
als as well as several technical issues regarding their analytic computati
on using canonical differential equations. Finally I will comment on the r
emaining steps towards the computation of all relevant 3-loop topologies a
nd their application to amplitude calculations.\n\nhttps://indico.ph.ed.ac
.uk/event/118/contributions/2353/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2353/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Arnd Behring - A first look at the two-mass QCD contributions to t
he four-loop rho parameter
DTSTART;VALUE=DATE-TIME:20230530T080000Z
DTEND;VALUE=DATE-TIME:20230530T083000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2352@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Arnd Behring (CERN)\nThe rho parameter is an importa
nt Standard Model precision observable. It is currently known to four-loop
order in QCD in the limit of vanishing bottom quark mass. When the rho pa
rameter was calculated at three-loop order with exact bottom quark mass de
pendence\, it was discovered that elliptic integrals enter the results. In
this talk\, we report on the status of our calculation of the rho paramet
er at four-loop order in QCD with exact dependence on the bottom quark mas
s with a particular emphasis on the mathematical structure of the integral
s that enter the results.\n\nhttps://indico.ph.ed.ac.uk/event/118/contribu
tions/2352/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2352/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Manuel Egner - Semileptonic and nonleptonic b-decays at NNLO
DTSTART;VALUE=DATE-TIME:20230530T180000Z
DTEND;VALUE=DATE-TIME:20230530T183000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2350@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Manuel Egner (KIT)\nThe decay of B mesons can be des
cribed in the Heavy Quark Expansion as the decay of a free bottom quark pl
us corrections which are suppressed by powers of 1/m_b. The focus of the t
alk will be on the calculation of the NNLO corrections to semileptonic and
nonleptonic decays of a free bottom quark including a non-vanishing charm
quark mass. For the semileptonic decays we obtain an analytic result by s
olving differential equations and fixing boundary conditions in the limit
of a heavy charm quark. Our analytic expression can be compared to previou
s known results obtained via expansions in the mass ratio m_c/m_b. In a se
cond approach we calculate precise numerical expansions of all master inte
grals with the help of differential equations which can describe the whole
parameter space from m_c/m_b=1 to m_c/m_b=0. I will also give an outlook
on the ongoing nonleptonic calculation\, where the same techniques as in t
he semileptonic case are used.\n\nhttps://indico.ph.ed.ac.uk/event/118/con
tributions/2350/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2350/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giuseppe Bevilacqua - Modelling uncertainties and prompt b-jet ide
ntification in ttbb with dilepton signatures at the LHC
DTSTART;VALUE=DATE-TIME:20230530T170000Z
DTEND;VALUE=DATE-TIME:20230530T173000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2348@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Giuseppe Bevilacqua (NCSR Demokritos)\nAs one of the
primary sources of QCD background to $pp \\to t\\bar{t}H(H\\to b\\bar{b})
$ at the LHC\, the $t\\bar{t}b\\bar{b}$ production process demands precise
theoretical predictions and estimates of the dominant uncertainties. On t
op of that\, the capacity of properly disentangling the prompt b-jets and
the b-jets from top-quark decays has important phenomenological consequenc
es. In this talk we present state-of-the-art predictions for ttbb producti
on with dilepton decays at the LHC as obtained from a full off-shell calcu
lation at NLO QCD accuracy. We discuss the dominant theory uncertainties\,
assess the relevance of double-\, single- and non-resonant contributions
and investigate the impact of different b-jet definitions on the cross sec
tion. Finally we present a kinematics-based prescription to cope with the
identification of the prompt b-jets.\n\nhttps://indico.ph.ed.ac.uk/event/1
18/contributions/2348/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2348/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giovanni Pelliccioli - Electroweak and QCD corrections to off-shel
l single-top production in association with a Z boson at the LHC
DTSTART;VALUE=DATE-TIME:20230530T153000Z
DTEND;VALUE=DATE-TIME:20230530T160000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2346@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Giovanni Pelliccioli (Max-Planck-Institut für Physi
k)\nThe associated production of a single top quark with a Z boson (tZj) r
epresents an important probe of the EW sector of the Standard Model. Since
differential measurements of tZj are expected to enhance the sensitivity
to new-physics effects\, and the experimental interest in this direction i
s growing in the light of upcoming LHC runs\, it is crucial to improve the
off-shell modelling of this process for realistic fiducial regions. We pr
esent the first Standard-Model calculation of the off-shell tZj production
in the multi-lepton decay channel including NLO EW and QCD corrections to
the LO EW signal. All off-shell effects and spin correlations are account
ed for\, both at LO and at NLO. Relying on a realistic fiducial volume\, w
e highlight the most relevant effects coming from radiative corrections an
d from irreducible-background contamination on total and differential cros
s sections.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2346/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2346/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Stremmer - ttjj - NLO QCD corrections to top quark pair pro
duction and decays at the LHC
DTSTART;VALUE=DATE-TIME:20230530T150000Z
DTEND;VALUE=DATE-TIME:20230530T153000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2345@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Daniel Stremmer (RWTH Aachen University)\nIn this ta
lk we present the calculation of NLO QCD corrections to $pp \\to t\\bar{t}
jj$ in the dilepton decay channel. The narrow width approximation is used
to model the decays of the top quark pair preserving spin correlations. Je
t radiation and QCD corrections are consistently included in the productio
n and decay of the top quarks. We discuss the size of NLO QCD corrections
and the main theoretical uncertainties of fiducial cross sections at the i
ntegrated and differential level. In addition\, we examine the contributio
ns of jet radiation in the production and decay of the top quark pair\, as
well as the mixed contribution\, in which jet radiation is simultaneously
present in the production and decay stage.\n\nhttps://indico.ph.ed.ac.uk/
event/118/contributions/2345/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2345/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kai Yan - Multi-point energy correlations in N=4 Super Yang-Mills
Theory
DTSTART;VALUE=DATE-TIME:20230530T140000Z
DTEND;VALUE=DATE-TIME:20230530T143000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2344@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Kai Yan (Shanghai Jiao Tong University)\nThe Energy
Correlator observables probe the geometric distributions of energy flow in
the final states of particle scattering experiments. They provide valuabl
e data for studies ranging from conformal field theories to jet substructu
re. We present an analytic formula for the three-point energy correlator (
EEEC) at leading order (LO) in N = 4 super Yang Mills theory\, which exhib
its unexplored simplicity and novel features in its function space. In add
ition we introduce a new approach to obtaining higher-point correlators in
the small-angle limit from the super form factor of protected scalar oper
ators. These results provide tools and experience for QCD\, which is pheno
menologically relevant for the cutting-edge studies at LHC.\n\nhttps://ind
ico.ph.ed.ac.uk/event/118/contributions/2344/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2344/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yu Jiao Zhu - Elliptic Moduli of Bhabha Scattering
DTSTART;VALUE=DATE-TIME:20230530T133000Z
DTEND;VALUE=DATE-TIME:20230530T140000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2343@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Yu Jiao Zhu (Bonn University)\nAmplitude are geometr
ic objects and we have ambitions to classify them. As functions of discret
e indices of color\, charge\, helicity\, ...\, and spin\, they are tensors
on the Fock spaces of elementary particles. Linear spaces\, like the Fock
spaces\, they have automorphisms under which a given tensor is transforme
d into another in the equivalent class. In this sense\, equivalent classes
of tensors are orbits under the action of linear automorphism groups\, it
is thus natural to represent each equivalent class of tensors by normal f
orms composed of `invariants'. E.g.\, matrices under congruence they class
ify $(0\,2)$-type bilinear forms\, while under similarity they classify $(
1\,1)$-type linear endomorphisms\, two such $(1\,1)$ forms are equivalent
if and only if their corresponding characteristic matrices share the same
set of Smith invariant factors over a polynomial PID (principal ideal doma
in). On the other hand\, amplitude in massive theory is quite often associ
ated with families of elliptic curves parameterized by the Mandelstam vari
ables. Just like automorphisms of linear spaces leads to the transformatio
n between equivalent tensors\, isomorphisms of elliptic curves lead to the
modular transformation of the symbol letters. Just like equivalent classe
s of tensors are represented by normal forms\, the space of equivalent cla
sses of elliptic curves are represented by fundamental domains of moduli c
urves (spaces) $\\Gamma\\backslash\\mathbb{H}$. In this spirit\, we are ai
med at a classification of different scattering processes according to the
underlying moduli space\, deriving potential dimension formulas and funct
ion bases for the symbol letters. In this talk\, I report a first step tow
ards the land of amplitude beyond genus one -- the complete analytic compu
tation of the 2-loop Bhabha scattering in Quantum Electrodynamics. I will
start from the correspondence between modular curves $\\Gamma\\backslash\\
mathbb{H}$ and elliptic moduli space with level structures\, and then use
the sunrise family to show how we parameterize the punctured Riemann spher
e through principal modular function\, and eventually jump over to modular
parameterization of elliptic K3 surface through the universal curves $\\m
athcal{E}_{\\Gamma_1(4)\\backslash\\mathbb{H}}$. I will highlight the choi
ce of a \\emph{universal rational marked point} inspired by \\textrm{Morde
ll–Weil theorem}\, and show that Bhabha scattering and planar top quark
production at sector 79 are described by the same moduli space of $\\maths
cr{M}_{1\;2}[4]$ with $4$-level structures\, thus should be represented by
the same class of function space.\n\nhttps://indico.ph.ed.ac.uk/event/118
/contributions/2343/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2343/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mathieu Giroux - Looping the loops: a tale of elliptic dual Feynma
n integrals
DTSTART;VALUE=DATE-TIME:20230530T130000Z
DTEND;VALUE=DATE-TIME:20230530T133000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2342@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Mathieu Giroux (McGill University)\nMulti-loop Feynm
an integrals are the cornerstone of modern perturbative approaches to quan
tum field theory and a pillar of precision computations for colliders as w
ell as gravitational wave experiments. It is therefore essential to develo
p efficient method to evaluate them. A big bottleneck in that direction is
the necessity to deal with integrals depending on many scales. In this ta
lk\, I will present a new method designed to handle such problem\, namely
a loop-by-loop approach to the computation of differential equation for (d
ual) Feynman integrals. As a proof of concept example\, I will discuss how
one can obtain a 'ready to integrate’ differential equation for the une
qual mass elliptic sunrise integral near 4-dimension.\n\nhttps://indico.ph
.ed.ac.uk/event/118/contributions/2342/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2342/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simone Zoia - Two-loop five-particle scattering amplitudes
DTSTART;VALUE=DATE-TIME:20230530T110000Z
DTEND;VALUE=DATE-TIME:20230530T113000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2341@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Simone Zoia (University of Turin)\nI discuss the rec
ent advances in the computation of two-loop scattering amplitudes for five
-particle processes. The latter are fundamental ingredients to obtain pred
ictions at the next-to-next-to-leading order (NNLO) in QCD for many intere
sting LHC processes. I discuss the state-of-the-art technology for computi
ng scattering amplitudes analytically\, and present new results relevant f
or the LHC phenomenology.\n\nhttps://indico.ph.ed.ac.uk/event/118/contribu
tions/2341/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2341/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rene Poncelet - NNLO QCD corrections to event-shapes at the LHC
DTSTART;VALUE=DATE-TIME:20230530T103000Z
DTEND;VALUE=DATE-TIME:20230530T110000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2340@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Rene Poncelet (Cambridge University Cavendish Labora
tory)\nMulti-jet rates at hadron colliders provide a unique possibility fo
r probing Quantum Chromodynamics (QCD)\, the theory of strong interactions
. By comparing theory predictions with collider data\, one can directly te
st perturbative QCD\, extract fundamental parameters like the strong coupl
ing and search for physics beyond the Standard Model. Recent developments
enabled lifting three-jet cross-sections to next-to-next-to-leading order
(NNLO) in QCD. I will present numerical results for three-to-two jet ratio
s and event shapes at the Large Hadron Collider (LHC). Then\, I will discu
ss the first extraction of the strong coupling constant from event shapes
at the LHC with NNLO QCD accuracy.\n\nhttps://indico.ph.ed.ac.uk/event/118
/contributions/2340/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2340/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulio Gambuti - Five point amplitudes in full colour QCD
DTSTART;VALUE=DATE-TIME:20230530T100000Z
DTEND;VALUE=DATE-TIME:20230530T103000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2339@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Giulio Gambuti (University of Oxford)\nI will discus
s the two-loop computation of massless QCD helicity amplitudes with five e
xternal states and full colour dependence.\n\nhttps://indico.ph.ed.ac.uk/e
vent/118/contributions/2339/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2339/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ben Page - Evanescent Integrals from Local Subtraction
DTSTART;VALUE=DATE-TIME:20230530T083000Z
DTEND;VALUE=DATE-TIME:20230530T090000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2337@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Ben Page (CERN)\nEvanescent integrals are those whos
e integrands vanish when considered on loop momentum configurations that a
re strictly four-dimensional. They naturally span the space of dimensional
ly-regulated integrals that are missed when performing four-dimensional un
itarity cuts. Such integrals are well understood at one loop\, where they
give rise to the so-called "rational part" of the amplitude. In this talk\
, we discuss a new approach to computing evanescent integrals that general
izes to the two-loop level. Our method makes use of the local counterterm
formalism of Anastasiou and Sterman\, which we use to show that these inte
grals can be broken down into contributions from soft\, collinear and ultr
a-violet regions. These contributions are much simpler than the original t
wo-loop integral: they take the form of products of one-loop integrals\, o
r one-fold integrals over one-loop integrals. To demonstrate the power of
our approach\, we apply it to the two-loop five-point all-plus amplitude a
nd find that at both one and two loops the finite remainder is given by on
ly ultra-violet contributions.\n\nhttps://indico.ph.ed.ac.uk/event/118/con
tributions/2337/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2337/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexandre Salas-Bernárdez - Flow-oriented Perturbation Theory
DTSTART;VALUE=DATE-TIME:20230530T073000Z
DTEND;VALUE=DATE-TIME:20230530T080000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2335@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Alexandre Salas-Bernárdez (Universidad Complutense
de Madrid)\nI will present flow oriented perturbation theory (FOPT)\, a co
ordinate space analogue of time-ordered perturbation theory and loop-tree
duality. Within this approach\, a generic Feynman graph is mapped to a sum
of all its possible different energy-flows respecting energy conservation
at each vertex (strongly connected directed graphs). In the FOPT framewor
k\, the integrals associated with virtual and real corrections turn out to
have the same integral measure. Hence\, FOPT shows promising potential in
the context of explicit phase-space integration with manifest cancellatio
n of real and virtual singularities. Additionally\, I will present a FOPT
representation of the S-matrix that exhibits manifest infrared singularity
factorization on a per-diagram level.\n\nhttps://indico.ph.ed.ac.uk/event
/118/contributions/2335/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2335/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pavel Novichkov - Minimally divergent integral bases and special r
elations
DTSTART;VALUE=DATE-TIME:20230529T180000Z
DTEND;VALUE=DATE-TIME:20230529T183000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2334@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Pavel Novichkov (IPhT CEA/Saclay)\nIn multiloop comp
utations\, choosing an integral basis that minimizes infrared divergences
holds the promise of simplifying results. I describe a procedure based on
analysis of Landau equations for finding sets of finite integrals. The sam
e technique can also be applied to finding integrals which are manifestly
O(ϵ). These integrals can give rise to special relations between integral
s beyond those arising from integration by parts.\n\nhttps://indico.ph.ed.
ac.uk/event/118/contributions/2334/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2334/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xiao Liu - New tools towards fast evaluation of Feynman integrals
DTSTART;VALUE=DATE-TIME:20230529T173000Z
DTEND;VALUE=DATE-TIME:20230529T180000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2333@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Xiao Liu (University of Oxford)\nIn this talk\, I wi
ll introduce new tools towards the evaluation of Feynman integrals\, inclu
ding AMFlow and Blade. AMFlow\, based on auxiliary mass flow method\, whic
h can numerically evaluate Feynman integrals in an efficient and systemati
c way\, have proved to be very useful in the past year. Another tool named
Blade\, which is based on block-triangular relations among Feynman integr
als\, can perform much faster samling in finite field than traditional int
egration-by-parts system and as a result\, much more efficient reduction o
f Feynman integrals.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions
/2333/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2333/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hjalte Frellesvig - Releative Cohomology and Feynman Integrals
DTSTART;VALUE=DATE-TIME:20230529T170000Z
DTEND;VALUE=DATE-TIME:20230529T173000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2332@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Hjalte Frellesvig (NBIA\, Copenhagen)\nI will discus
s the use of intersection numbers computed in relative cohomologies for th
e manipulation of Feynman integrals in Dimensional Regularization. This ap
proach has the potential to revolutionize integral reductions\, which with
current techniques are a significant bottleneck for phenomenologically re
levant scattering amplitude computations.\n\nhttps://indico.ph.ed.ac.uk/ev
ent/118/contributions/2332/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2332/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Broadhurst - 3-loop tadpoles with substructure from 12 ellip
tic curves
DTSTART;VALUE=DATE-TIME:20230529T153000Z
DTEND;VALUE=DATE-TIME:20230529T160000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2330@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: David Broadhurst (Open University\, UK)\nThe generic
3-loop tetrahedral tadpole\, with 6 distinct masses\, has elliptic subtru
cture originating from 12 distinct elliptic curves. I shall show how to ev
aluate it\, at high precision and great speed\, by integrating dilogarithm
s against complete integrals of the third kind\, for which there is a proc
eudre of the arithmetic-geometric mean that is astoundingly fast. The elem
ents of this method go back more 60 years\, to Gunnar Kallen and Afaf Sabr
y. I learnt about them more than 50 years from Gabriel Barton. They deserv
e to better known.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2
330/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2330/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oliver Schnetz - Loop calculations with graphical functions
DTSTART;VALUE=DATE-TIME:20230529T140000Z
DTEND;VALUE=DATE-TIME:20230529T143000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2328@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Oliver Schnetz (Friedrich-Alexander-University)\nWe
will provide a guided tour through the method of calculating high loop ord
er renormalization functions (7 loops $\\phi^4$\, 6 loops $\\phi^3$) with
graphical functions. This tour will lead through graphical functions in ev
en dimensions (for calculating primitive Feynman periods\, with M. Borinsk
y)\, generalized single-valued hyperlogarithms (GSVHs\, a suitable functio
n space)\, and the extension to non-integer dimensions (dimensional regula
rization). We will briefly discuss future applications to gauge theories (
most notably QED and QCD).\n\nhttps://indico.ph.ed.ac.uk/event/118/contrib
utions/2328/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2328/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiara Savoini - ttH production in NNLO QCD
DTSTART;VALUE=DATE-TIME:20230529T180000Z
DTEND;VALUE=DATE-TIME:20230529T183000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2325@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Chiara Savoini (University of Zurich)\nThe associate
d production of a Higgs boson with a top–antitop quark pair is a crucial
process at the LHC since it allows for a direct measurement of the top-qu
ark Yukawa coupling. In this talk we will present the computation of the r
adiative corrections to this process at the next-to-next-to-leading order
(NNLO) in QCD perturbation theory. This represents the very first computat
ion for a 2 → 3 process with massive coloured particles at this perturba
tive order. In order to overcome the bottleneck of the missing two-loop am
plitudes (which are at the frontier of current techniques)\, we developed
a soft Higgs boson approximation\, which enabled us to reliably quantify t
he impact of the yet unknown two-loop contribution. The IR-singularities a
re treated within the well-established qT-subtraction framework\, properly
extended to the case of heavy-quark production in association with a colo
urless system.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2325/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2325/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Narayan Rana - Mixed QCD-EW two-loop amplitudes for charged curren
t Drell-Yan production
DTSTART;VALUE=DATE-TIME:20230529T173000Z
DTEND;VALUE=DATE-TIME:20230529T180000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2324@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Narayan Rana (NISER Bhubaneswar)\nIn this talk\, we
present the mixed QCD-EW two-loop virtual corrections for the charged curr
ent Drell-Yan production. The presence of one additional mass compare to t
he neutral current case makes the computation of the two-loop amplitudes e
xtremely challenging\, specially the two-loop Feynman integrals. Our appro
ach to evaluate the relevant two-loop Feynman integrals using semi-analyti
cal method\, allows us to obtain the renormalized two-loop amplitudes. We
perform the subtraction of the universal infrared singularities mostly ana
lytically and present the numerical evaluation of the hard function as a g
rid.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2324/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2324/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Melih Arslan Ozcelik - Two-loop master integrals and form-factors
for pseudo-scalar quarkonia
DTSTART;VALUE=DATE-TIME:20230529T170000Z
DTEND;VALUE=DATE-TIME:20230529T173000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2323@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Melih Arslan Ozcelik (IJCLab - CNRS/Université Pari
s-Saclay)\nWe compute the two-loop master integrals relevant for the NNLO
QCD correction to heavy pseudo-scalar quarkonium production and decay both
analytically and numerically. The analytic expressions involve elliptic m
ultiple polylogarithms and iterated integrals of modular forms. We discuss
the master integral computation and the form-factors obtained. We briefly
discuss their phenomenological importance.\n\nhttps://indico.ph.ed.ac.uk/
event/118/contributions/2323/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2323/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luca Buonocore - Associated production of a W boson and massive bo
ttom quarks in NNLO QCD
DTSTART;VALUE=DATE-TIME:20230529T160000Z
DTEND;VALUE=DATE-TIME:20230529T163000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2322@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Luca Buonocore (University of Zurich)\nWe present th
e first calculation for the production of a W boson in association with ma
ssive bottom quarks (Wbb) at hadron colliders at next-to-next-to-leading o
rder (NNLO) in QCD. The use of massive bottom quarks avoids the ambiguitie
s associated with the correct flavour assignment in massless calculations\
, paving the way to a more realistic comparison with experimental data. Th
e relevant five-point two-loop virtual amplitude with three massive legs r
equired to reach the NNLO accuracy is still not yet available. Exploiting
the hierarchy between the bottom quark mass and the characteristic energy
scale of the process\, a reliable expression has been obtained through a m
assification procedure applied to the results available for massless botto
m quarks. We present phenomenological results considering proton–proton
collisions at 13.6 TeV for inclusive Wbb production and within a fiducial
region relevant for the associated production of a W boson and a Higgs bos
on decaying into a bottom-quark pair\, for which Wbb production represents
one of the most relevant backgrounds. NNLO corrections are substantial an
d their inclusion is mandatory to obtain reliable predictions.\n\nhttps://
indico.ph.ed.ac.uk/event/118/contributions/2322/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2322/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bakul Agarwal - Next-to-Leading-Order QCD corrections to ZZ produc
tion through gluon fusion
DTSTART;VALUE=DATE-TIME:20230529T153000Z
DTEND;VALUE=DATE-TIME:20230529T160000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2321@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Bakul Agarwal (Karlsruhe Institute of Technology (IT
P))\nPair production of Z bosons is an essential process at the LHC. It is
a significant background to Higgs production\, and subsequent decay throu
gh the four lepton channel\, as well as an important signal process for ne
w physics searches. In this talk\, we present our calculation of the next-
to-leading order QCD corrections to Z-pair production through gluon fusion
with full top quark mass dependence. We discuss the details of the calcul
ation of the challenging two-loop virtual amplitudes. We then present phen
omenological results for this process.\n\nhttps://indico.ph.ed.ac.uk/event
/118/contributions/2321/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2321/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A.H. Ajjath - di-Higgs at N3LO+N3LL
DTSTART;VALUE=DATE-TIME:20230529T140000Z
DTEND;VALUE=DATE-TIME:20230529T143000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2319@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Ajjath Aabdul Hameed ()\nWe present the soft-gluon r
esummation for the Higgs boson pair production in the gluon fusion channel
to the next-to-next-to-next-to-leading logarithmic(N3LL) accuracy. After
matching N3LL to the next-to-next-to-next-to-leading order (N3LO) QCD calc
ulation in the infinite top quark mass approximation\, we show that the ce
ntral values of the inclusive cross sections are quite stable with respect
to N3LO\, while the conventional renormalisation and factorisation scale
uncertainties are reduced by a factor of two\, reaching to the subpercent
level. After combining with the full top-quark mass dependent next-to-lead
ing order QCD results\, our most advanced predictions are presented for bo
th the inclusive total cross sections and the differential invariant mass
distributions of the Higgs pair.\n\nhttps://indico.ph.ed.ac.uk/event/118/c
ontributions/2319/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2319/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefan Weinzierl - Feynman integrals\, geometries and differential
equations
DTSTART;VALUE=DATE-TIME:20230529T110000Z
DTEND;VALUE=DATE-TIME:20230529T113000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2316@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Stefan Weinzierl (University of Mainz)\nWe may assoc
iate a geometry to a Feynman integral. Understanding the geometry helps in
computing the Feynman integral. In this talk I will discuss how Feynman i
ntegrals related to non-trivial geometries like Calabi-Yau manifolds can b
e computed with the help of the method of differential equations. In parti
cular I will discuss an ansatz\, which casts the differential equation int
o an epsilon-factorised form.\n\nhttps://indico.ph.ed.ac.uk/event/118/cont
ributions/2316/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2316/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefano Forte - Can we trust machine learning? PDFs as a case stud
y
DTSTART;VALUE=DATE-TIME:20230529T100000Z
DTEND;VALUE=DATE-TIME:20230529T103000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2314@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Stefano Forte (Universita' di Milano)\nI critically
examine issues that arise when applying modern machine learning techniques
in the context of precision collider physics\, by specifically considerin
g the case of PDF determinations. Questions that I address include: Can we
trust the machine learning model to correctly generalize from known examp
les? How can we validate results\, specifically for uncertainties? Can we
detect over- and under-learning? Can a machine learning model detect incon
sistencies in the data that it is being shown?\n\nhttps://indico.ph.ed.ac.
uk/event/118/contributions/2314/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2314/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Penin - Higgs boson production at the next-to-next-to-le
ading power
DTSTART;VALUE=DATE-TIME:20230529T080000Z
DTEND;VALUE=DATE-TIME:20230529T083000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2312@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Alexander Penin (University of Alberta)\nWe study th
e amplitudes of the light quark mediated Higgs boson production via gluon
fusion in the high-energy limit. A complete analytic result is obtained fo
r the three-loop $O(m_q^3)$ double-logarithmic term while and the all-orde
r analysis is performed in the large-$N_c$ limit of QCD and in the abelian
approximation.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2312
/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2312/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gudrun Heinrich - Two Higgs bosons\, two loops\, x+2 operators
DTSTART;VALUE=DATE-TIME:20230529T083000Z
DTEND;VALUE=DATE-TIME:20230529T090000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2310@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Gudrun Heinrich (Karlsruhe Institute of Technology)\
nIn the first part of the talk\, methods for the calculation of two-loop a
mplitudes with several mass scales\, such as HH\, HJ or HZ production in g
luon fusion\, will be discussed. The second part will focus on Higgs boson
pair production\, in particular the combination of NLO QCD corrections wi
th anomalous couplings in an Effective Field Theory framework. Predictions
for the Higgs boson pair invariant mass spectrum\, including leading oper
ators as well as loop-suppressed operators such as 4-top-quark-operators\,
will be presented.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/
2310/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2310/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Organised excursions
DTSTART;VALUE=DATE-TIME:20230531T130000Z
DTEND;VALUE=DATE-TIME:20230531T170000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2457@indico.ph.ed.ac.uk
DESCRIPTION:https://indico.ph.ed.ac.uk/event/118/contributions/2457/
LOCATION:Crieff Hydro Hotel
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2457/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conference Registration
DTSTART;VALUE=DATE-TIME:20230528T140000Z
DTEND;VALUE=DATE-TIME:20230528T190000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2456@indico.ph.ed.ac.uk
DESCRIPTION:https://indico.ph.ed.ac.uk/event/118/contributions/2456/
LOCATION:Outside Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2456/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Johannes Henn - Four-dimensional integration methods for Feynman i
ntegrals
DTSTART;VALUE=DATE-TIME:20230602T073000Z
DTEND;VALUE=DATE-TIME:20230602T080000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2406@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Johannes Henn (Max Planck Institute for Physics\, Mu
nich)\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2406/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2406/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Gehrmann - Precision QCD calculations for vector boson obse
rvables
DTSTART;VALUE=DATE-TIME:20230531T083000Z
DTEND;VALUE=DATE-TIME:20230531T090000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2369@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Thomas Gehrmann (University of Zurich)\nhttps://indi
co.ph.ed.ac.uk/event/118/contributions/2369/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2369/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christian Brønnum-Hansen - Non-factorisable contributions to t-ch
annel single top and VBF Higgs production
DTSTART;VALUE=DATE-TIME:20230529T150000Z
DTEND;VALUE=DATE-TIME:20230529T153000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2320@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Christian Brønnum-Hansen (Karlsruhe Institute of Te
chnology)\nIn both single top and VBF Higgs production a structure functio
n approximation can be applied to obtain the leading colour contribution.
This approximation contains only so-called factorisable diagrams and is ex
act at NLO. However\, at NNLO non-factorisable contributions come into pla
y. A particular challenge for calculations at this order is the evaluation
of two-loop diagrams with several mass scales. In this talk I will presen
t calculations and results for the phenomenological impact of non-factoris
able contributions in t-channel single top and VBF Higgs production.\n\nht
tps://indico.ph.ed.ac.uk/event/118/contributions/2320/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2320/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Federico Buccioni - Signal-background interference effects in Higg
s-mediated diphoton production beyond NLO
DTSTART;VALUE=DATE-TIME:20230529T133000Z
DTEND;VALUE=DATE-TIME:20230529T140000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2318@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Federico Buccioni (TUM)\nIn this talk I will conside
r signal-background interference effects in Higgs-mediated diphoton produc
tion at the LHC. The inclusion of such effects results in a shift of the d
iphoton invariant mass distribution and in a destructive contribution to t
he total cross section. As pointed out in earlier works\, one can exploit
interference studies to put bounds on the Higgs boson decay width. After r
eviewing the Higgs interferometry framework I will present an extension of
this analysis up to NNLO QCD in the soft-virtual approximation.\n\nhttps:
//indico.ph.ed.ac.uk/event/118/contributions/2318/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2318/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kirill Melnikov - Power corrections to collider processes
DTSTART;VALUE=DATE-TIME:20230529T103000Z
DTEND;VALUE=DATE-TIME:20230529T110000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2315@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Kirill Melnikov (TTP KIT)\nI will review novel deve
lopments related to an analytic understanding of power corrections to coll
ider processes in the context of renormalon calculus.\n\nhttps://indico.ph
.ed.ac.uk/event/118/contributions/2315/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2315/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sinead Farrington - Highlights from Experiment and where next for
precision
DTSTART;VALUE=DATE-TIME:20230529T073000Z
DTEND;VALUE=DATE-TIME:20230529T080000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2309@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Sinead Farrington ()\nhttps://indico.ph.ed.ac.uk/eve
nt/118/contributions/2309/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2309/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Keith Ellis - Resummation Studies for LHC
DTSTART;VALUE=DATE-TIME:20230602T110000Z
DTEND;VALUE=DATE-TIME:20230602T113000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2412@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Keith Ellis (IPPP\, Durham)\nhttps://indico.ph.ed.ac
.uk/event/118/contributions/2412/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2412/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Kosower - Universal Decomposition of Phase-Space Integrands
DTSTART;VALUE=DATE-TIME:20230602T100000Z
DTEND;VALUE=DATE-TIME:20230602T103000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2410@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: David A Kosower (IPhT\, CEA-Saclay)\nOne-loop integr
ands can be written in terms of a simple\, process-independent basis. A si
milar basis exists for integrands of phase-space integrals for the real-em
ission contribution at next-to-leading order. The demonstration deploys te
chniques from computational algebraic geometry in order to partial-fractio
n integrands in a systematic way. This provides the first step towards a d
ecomposition of phase-space integrals in a basis of master integrals.\n\nh
ttps://indico.ph.ed.ac.uk/event/118/contributions/2410/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2410/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ekta Chaubey - Two-loop QCD and QED corrections to light-by-light
scattering
DTSTART;VALUE=DATE-TIME:20230602T090000Z
DTEND;VALUE=DATE-TIME:20230602T093000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2409@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Ekta Chaubey (ekta@lpthe.jussieu.fr)\nIn this talk w
e present the analytic results for two-loop QCD as well as QED corrections
to light-by-light scattering including contributions due to massive inter
nal fermions.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2409/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2409/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthias Steinhauser - Analytic approximations of $2\\to 2$ proces
ses with massive internal particles
DTSTART;VALUE=DATE-TIME:20230602T083000Z
DTEND;VALUE=DATE-TIME:20230602T090000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2408@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Matthias Steinhauser (KIT)\nWe consider two-loop cor
rections to $2\\to 2$ scattering processes with massive particles in the f
inal state and massive particles in the loop. We discuss the combination o
f analytic expansions in the high-energy limit and for small Mandelstam va
riable~$t$. For the example of double Higgs boson production we show that
the whole phase space can be covered and time-consuming numerical integrat
ions can be avoided.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions
/2408/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2408/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Peter Marquard - Three-loop massive form factors
DTSTART;VALUE=DATE-TIME:20230602T080000Z
DTEND;VALUE=DATE-TIME:20230602T083000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2407@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Peter Marquard (DESY)\nhttps://indico.ph.ed.ac.uk/ev
ent/118/contributions/2407/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fernando Febres Cordero - Numerical Unitarity for Binary Dynamics
DTSTART;VALUE=DATE-TIME:20230601T173000Z
DTEND;VALUE=DATE-TIME:20230601T180000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2404@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Fernando Febres Cordero (Florida State University)\n
https://indico.ph.ed.ac.uk/event/118/contributions/2404/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2404/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Melissa van Beekveld - Threshold resummation for the production of
four top quarks
DTSTART;VALUE=DATE-TIME:20230601T160000Z
DTEND;VALUE=DATE-TIME:20230601T163000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2402@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Melissa van Beekveld (University of Oxford)\nhttps:/
/indico.ph.ed.ac.uk/event/118/contributions/2402/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2402/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Herschel Chawdhry - Quantum algorithms for the simulation of pertu
rbative QCD processes
DTSTART;VALUE=DATE-TIME:20230601T110000Z
DTEND;VALUE=DATE-TIME:20230601T113000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2396@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Herschel Chawdhry (University of Oxford)\nQuantum co
mputers offer major speed-ups for problems like prime factorisation\, sear
ching\, and quantum simulation. Recent years have seen the emergence of qu
antum algorithms for simulating lattice QCD and parton showers\, but the q
uantum simulation of generic perturbative QCD processes has largely remain
ed unexplored. As a first non-trivial step\, I will discuss the quantum si
mulation of colour in perturbative QCD. In particular\, I will present qua
ntum computing circuits that simulate the colour parts of QCD Feynman diag
rams. As an example application\, we use these circuits to calculate the c
olour algebra for various perturbative QCD processes and diagrams. (Based
on arXiv:2302.xxxxx by H.A.Chawdhry and M.Pellen)\n\nhttps://indico.ph.ed.
ac.uk/event/118/contributions/2396/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2396/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chen-Yu Wang - Heaviside functions and the zero-jettiness soft fun
ction at N3LO QCD
DTSTART;VALUE=DATE-TIME:20230601T100000Z
DTEND;VALUE=DATE-TIME:20230601T103000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2394@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Chen-Yu Wang (MPP)\nThe advancement of computation t
echniques enables a number of N3LO calculations in perturbative QCD\, whic
h are crucial to reaching percent level accuracy in the LHC (and the upcom
ing HL-LHC) phenomenology. An important part of this effort involves prope
rly extracting IR singularities at N3LO. The N-jettiness slicing scheme is
one of the techniques to deal with this problem\, but is only available u
p to N2LO due to the complexity introduced by the Heaviside functions in t
he soft function. In this talk\, we will discuss how we handle the Heavisi
de functions in the computation and report the recent progress of the zero
-jettiness soft function calculation at N3LO QCD.\n\nhttps://indico.ph.ed.
ac.uk/event/118/contributions/2394/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2394/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bennie Ward - New Results from IR-Improved Amplitude-Based Resumma
tion in Quantum Field Theory
DTSTART;VALUE=DATE-TIME:20230601T180000Z
DTEND;VALUE=DATE-TIME:20230601T183000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2389@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Bennie Ward (Baylor University)\nThere is a continui
ng effort to support and prepare the precision physics programs for the pr
esent and planned future colliders such as HL-LHC\, FCC\, CLIC\, CEPC\, an
d CPPC. We discuss new results from IR-improved amplitude-based resummatio
n in quantum field theory relevant to such support and preparation with so
me emphasis on the interplay between soft and collinear resummation algebr
as.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2389/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2389/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiara Signorile-Signorile - Advances in the nested soft-collinear
subtraction scheme
DTSTART;VALUE=DATE-TIME:20230601T150000Z
DTEND;VALUE=DATE-TIME:20230601T153000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2384@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Chiara Signorile-Signorile (Karlsruhe Institute of T
echnology)\nIn this talk\, I will present recent progress in the generalis
ation of the nested soft-collinear subtraction scheme to multi-parton fina
l state processes. The scheme has already been successfully applied to sca
tterings involving a limited number of coloured partons\, and it has shown
remarkable flexibility and good numerical performances. I will discuss ho
w to overcome the difficulties that arise from going beyond the previous i
mplementations\, considering as a case study the vector boson production i
n association with a jet at next-to-next-to-leading order in QCD.\n\nhttps
://indico.ph.ed.ac.uk/event/118/contributions/2384/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2384/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vitalii Maheria - Evaluating scattering amplitudes with pySecDec
DTSTART;VALUE=DATE-TIME:20230601T130000Z
DTEND;VALUE=DATE-TIME:20230601T133000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2381@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Vitalii Maheria (ITP KIT)\nI'd like to present the n
ew developments and talk about the current status of numerical evaluation
of multi-loop integrals and amplitudes using the new release of pySecDec (
v1.6)\, particularly concentrating on significant integration performance
improvements and automation related to expansion-by-regions.\n\nhttps://in
dico.ph.ed.ac.uk/event/118/contributions/2381/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2381/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Frank Petriello - Transverse single-spin asymmetries within and be
yond the Standard Model
DTSTART;VALUE=DATE-TIME:20230601T103000Z
DTEND;VALUE=DATE-TIME:20230601T110000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2379@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Frank Petriello (Northwestern University and Argonne
National Laboratory)\nWe discuss new observables for probing physics beyo
nd the SM within the framework of the Standard Model Effective Field Theor
y (SMEFT). We consider both existing measurements at the LHC\, and potenti
al future ones at upcoming colliders such as the Electron-Ion Collider (EI
C).\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2379/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2379/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michał Czakon - Jet and Photon Physics at high perturbative order
s in QCD
DTSTART;VALUE=DATE-TIME:20230531T110000Z
DTEND;VALUE=DATE-TIME:20230531T113000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2373@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Michał Czakon (RWTH Aachen University)\nI will pres
ent recently published as well as yet unpublished results on multi-photon
and multi-jet cross sections obtained with next-to-next-to-leading and pos
sibly higher order in perturbative QCD.\n\nhttps://indico.ph.ed.ac.uk/even
t/118/contributions/2373/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2373/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert Szafron - Towards N3LL jet veto
DTSTART;VALUE=DATE-TIME:20230531T103000Z
DTEND;VALUE=DATE-TIME:20230531T110000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2372@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Robert Szafron (Brookhaven National Laboratory)\nIn
my talk\, I will present the calculation of the two-loop soft and beam fun
ctions for the transverse-momentum distribution of the leading jet in the
production of a colour-singlet system such as a Higgs or Z boson. This cal
culation constitutes a vital component for the resummation of the transver
se-momentum distribution and the jet-vetoed cross-section at next-to-next-
to-next-to-leading logarithmic order (N3LL).\n\nhttps://indico.ph.ed.ac.uk
/event/118/contributions/2372/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2372/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tongzhi Yang - Renormalization of twist-two operators in covariant
gauge to three loops in QCD
DTSTART;VALUE=DATE-TIME:20230530T173000Z
DTEND;VALUE=DATE-TIME:20230530T180000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2365@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Tongzhi Yang (University of Zurich)\nhttps://indico.
ph.ed.ac.uk/event/118/contributions/2365/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2365/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gherardo Vita - Precision Standard Model Phenomenology at N3LO and
Beyond
DTSTART;VALUE=DATE-TIME:20230530T150000Z
DTEND;VALUE=DATE-TIME:20230530T153000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2361@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Gherardo Vita (CERN)\nhttps://indico.ph.ed.ac.uk/eve
nt/118/contributions/2361/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2361/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Becchetti - Two-loop Feynman integrals for top-quark pair p
lus jet production
DTSTART;VALUE=DATE-TIME:20230530T140000Z
DTEND;VALUE=DATE-TIME:20230530T143000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2360@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Matteo Becchetti (University of Turin)\nWe report on
recent progress for the QCD corrections to top-quark pair plus jet produc
tion. In particular\, we discuss a recent computation for the two-loop mas
ter integrals associated to a two-loop five-point pentagon-box integral co
nfiguration with one internal massive propagator\, that contributes to top
-quark pair production in association with a jet in the QCD planar limit.\
n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2360/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2360/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leonardo Vernazza - Factorization and resummation at next-to-leadi
ng power
DTSTART;VALUE=DATE-TIME:20230530T133000Z
DTEND;VALUE=DATE-TIME:20230530T140000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2359@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Leonardo Vernazza (INFN\, Torino)\nI will discuss re
cent progress concerning the factorization of physical observables and the
resummation of large logarithms at next-to-leading power\, focusing on th
e loop calculation of the universal functions in which physical observable
s factorize.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2359/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2359/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sven-Olaf Moch - QCD splitting functions at four loops
DTSTART;VALUE=DATE-TIME:20230530T103000Z
DTEND;VALUE=DATE-TIME:20230530T110000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2356@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Sven-Olaf Moch (University of Hamburg)\nWe present r
ecent results on the computation of the splitting functions in quantum chr
omodynamics at four loops.\n\nhttps://indico.ph.ed.ac.uk/event/118/contrib
utions/2356/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2356/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Johannes Bluemlein (presented by Kay Schoenwald) - Recent 3-Loop H
eavy Flavor Corrections to Deep-Inelastic Scattering
DTSTART;VALUE=DATE-TIME:20230530T100000Z
DTEND;VALUE=DATE-TIME:20230530T103000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2355@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Johannes Bluemlein (DESY)\nWe present recent analyti
c results on the 3-loop heavy flavor corrections to deep-inelastic scatter
ing.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2355/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2355/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreas van Hameren - Hybrid kT-factorization at NLO
DTSTART;VALUE=DATE-TIME:20230530T073000Z
DTEND;VALUE=DATE-TIME:20230530T080000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2351@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andreas van Hameren ()\nThe hybrid kT-factorization
formula\, for which one initial-state parton momentum is space-like and ca
rries non-vanishing transverse components while the other is on-shell\, is
promoted to NLO for arbitrary processes. We identify all soft and colline
ar divergencies in the partonic cross section\, and recognize that the non
-cancelling ones can be attributed to PDF evolution\, evolution kernel\, a
nd target impact factors. Furthermore\, we present expressions for one-loo
p amplitudes for 2->2 processes\, and a strategy to calculate the real cor
rections.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2351/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2351/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rhorry Gauld - The flavour of jets
DTSTART;VALUE=DATE-TIME:20230530T173000Z
DTEND;VALUE=DATE-TIME:20230530T180000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2349@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Rhorry Gauld (MPP Münich)\nhttps://indico.ph.ed.ac.
uk/event/118/contributions/2349/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2349/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paolo Torrielli - A new observable for W-mass determination
DTSTART;VALUE=DATE-TIME:20230530T160000Z
DTEND;VALUE=DATE-TIME:20230530T163000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2347@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Paolo Torrielli (Università di Torino and INFN)\nI
discuss a new observable for the determination of the W mass at hadron col
liders\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2347/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2347/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dmitry Chicherin - Pentagon Functions for One-Mass Scattering
DTSTART;VALUE=DATE-TIME:20230530T090000Z
DTEND;VALUE=DATE-TIME:20230530T093000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2338@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Dmitry Chicherin (LAPTh\, CNRS)\nhttps://indico.ph.e
d.ac.uk/event/118/contributions/2338/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2338/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zeno Capatti - Exposing the threshold structure of loop integrals
DTSTART;VALUE=DATE-TIME:20230530T080000Z
DTEND;VALUE=DATE-TIME:20230530T083000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2336@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Zeno Capatti (ETH Zürich)\nhttps://indico.ph.ed.ac.
uk/event/118/contributions/2336/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2336/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Henrik Jessen Munch - Tropical Feynman Integration in the Physical
Region
DTSTART;VALUE=DATE-TIME:20230529T160000Z
DTEND;VALUE=DATE-TIME:20230529T163000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2331@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Henrik Jessen Munch (University of Padova)\nWe propo
se a Monte Carlo integration algorithm for numerically evaluating Feynman
integrals in the physical region of phase space. The algorithm is an exten
sion of the tropical integration algorithm of M. Borinsky. Starting from t
he projective representation of a Feynman integral\, we implement Feynman'
s i*epsilon prescription via a suitable contour deformation\, whereafter t
ropical sampling is used to approximate the value of the integral. An acco
mpanying public code named 'feyntrop' is introduced\, which we use to pres
ent examples between 2 and 5 loops. This work is done in collaboration wit
h M. Borinsky and F. Tellander.\n\nhttps://indico.ph.ed.ac.uk/event/118/co
ntributions/2331/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2331/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Borinsky - Feynman amplitudes and the moduli space of grap
hs
DTSTART;VALUE=DATE-TIME:20230529T133000Z
DTEND;VALUE=DATE-TIME:20230529T140000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2327@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Michael Borinsky (ETH Zürich - ITS)\nhttps://indico
.ph.ed.ac.uk/event/118/contributions/2327/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2327/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xing Wang - \\epsilon-form for non-planar triangles with elliptic
curves at two loops
DTSTART;VALUE=DATE-TIME:20230529T130000Z
DTEND;VALUE=DATE-TIME:20230529T133000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2326@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Xing Wang (TUM)\nFeynman integrals beyond multiple p
loylogarithms are inevitable precision study at colliders. We use the non-
planar triangle cross ladder at two loops as an example to show how to obt
ain the \\epsilon-factorised differential equation systematically for elli
ptic Feynman integrals depending on one dimensionless kinematic variable.\
n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2326/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2326/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bernhard Mistlberger - Approximations for LHC Cross Sections using
Collinear Expansions
DTSTART;VALUE=DATE-TIME:20230529T090000Z
DTEND;VALUE=DATE-TIME:20230529T093000Z
DTSTAMP;VALUE=DATE-TIME:20240422T071935Z
UID:indico-contribution-118-2313@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Bernhard Mistlberger (SLAC)\nKinematic expansions of
scattering cross sections provide powerful methods of approximating key L
HC observables to a high degree of precision at reduced degree of complexi
ty in comparison to a full computation. I will show several recent advance
ments and examples in the development and application of collinear expansi
on techniques.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/2313/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2313/
END:VEVENT
END:VCALENDAR