BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Chen-Yu Wang - Heaviside functions and the zero-jettiness soft fun
ction at N3LO QCD
DTSTART:20230601T100000Z
DTEND:20230601T103000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2394@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Chen-Yu Wang (MPP)\n\nThe advancement of computation
techniques enables a number of N3LO calculations in perturbative QCD\, wh
ich are crucial to reaching percent level accuracy in the LHC (and the upc
oming HL-LHC) phenomenology. An important part of this effort involves pro
perly extracting IR singularities at N3LO. The N-jettiness slicing scheme
is one of the techniques to deal with this problem\, but is only available
up to N2LO due to the complexity introduced by the Heaviside functions in
the soft function. In this talk\, we will discuss how we handle the Heavi
side functions in the computation and report the recent progress of the ze
ro-jettiness soft function calculation at N3LO QCD.\n\nhttps://indico.ph.e
d.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:Herschel Chawdhry - Quantum algorithms for the simulation of pertu
rbative QCD processes
DTSTART:20230601T110000Z
DTEND:20230601T113000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2396@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Herschel Chawdhry (University of Oxford)\n\nQuantum
computers offer major speed-ups for problems like prime factorisation\, se
arching\, and quantum simulation. Recent years have seen the emergence of
quantum algorithms for simulating lattice QCD and parton showers\, but the
quantum simulation of generic perturbative QCD processes has largely rema
ined unexplored. As a first non-trivial step\, I will discuss the quantum
simulation of colour in perturbative QCD. In particular\, I will present q
uantum computing circuits that simulate the colour parts of QCD Feynman di
agrams. As an example application\, we use these circuits to calculate the
colour algebra for various perturbative QCD processes and diagrams. (Base
d on arXiv:2302.xxxxx by H.A.Chawdhry and M.Pellen)\n\nhttps://indico.ph.e
d.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:Matthias Steinhauser - Analytic approximations of $2\\to 2$ proces
ses with massive internal particles
DTSTART:20230602T083000Z
DTEND:20230602T090000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2408@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Matthias Steinhauser (KIT)\n\nWe consider two-loop c
orrections to $2\\to 2$ scattering processes with massive particles in the
final state and massive particles in the loop. We discuss the combination
of analytic expansions in the high-energy limit and for small Mandelstam
variable~$t$. For the example of double Higgs boson production we show tha
t the whole phase space can be covered and time-consuming numerical integr
ations can be avoided.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributio
ns/2408/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2408/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fernando Febres Cordero - Numerical Unitarity for Binary Dynamics
DTSTART:20230601T173000Z
DTEND:20230601T180000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2404@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Fernando Febres Cordero (Florida State University)\n
\nhttps://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:20230601T160000Z
DTEND:20230601T163000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2402@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Melissa van Beekveld (University of Oxford)\n\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:Peter Marquard - Three-loop massive form factors
DTSTART:20230602T080000Z
DTEND:20230602T083000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2407@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Peter Marquard (DESY)\n\nhttps://indico.ph.ed.ac.uk/
event/118/contributions/2407/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bernhard Mistlberger - Approximations for LHC Cross Sections using
Collinear Expansions
DTSTART:20230529T090000Z
DTEND:20230529T093000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2313@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Bernhard Mistlberger (SLAC)\n\nKinematic expansions
of scattering cross sections provide powerful methods of approximating key
LHC observables to a high degree of precision at reduced degree of comple
xity in comparison to a full computation. I will show several recent advan
cements and examples in the development and application of collinear expan
sion techniques.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/231
3/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2313/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Johannes Bluemlein (presented by Kay Schoenwald) - Recent 3-Loop H
eavy Flavor Corrections to Deep-Inelastic Scattering
DTSTART:20230530T100000Z
DTEND:20230530T103000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2355@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Johannes Bluemlein (DESY)\n\nWe present recent analy
tic results on the 3-loop heavy flavor corrections to deep-inelastic scatt
ering.\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:Sven-Olaf Moch - QCD splitting functions at four loops
DTSTART:20230530T103000Z
DTEND:20230530T110000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2356@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Sven-Olaf Moch (University of Hamburg)\n\nWe present
recent results on the computation of the splitting functions in quantum c
hromodynamics at four loops.\n\nhttps://indico.ph.ed.ac.uk/event/118/contr
ibutions/2356/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2356/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreas van Hameren - Hybrid kT-factorization at NLO
DTSTART:20230530T073000Z
DTEND:20230530T080000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2351@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andreas van Hameren\n\nThe hybrid kT-factorization f
ormula\, for which one initial-state parton momentum is space-like and car
ries non-vanishing transverse components while the other is on-shell\, is
promoted to NLO for arbitrary processes. We identify all soft and collinea
r divergencies in the partonic cross section\, and recognize that the non-
cancelling ones can be attributed to PDF evolution\, evolution kernel\, an
d target impact factors. Furthermore\, we present expressions for one-loop
amplitudes for 2->2 processes\, and a strategy to calculate the real corr
ections.\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:20230530T173000Z
DTEND:20230530T180000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2349@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Rhorry Gauld (MPP Münich)\n\nhttps://indico.ph.ed.a
c.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:20230530T160000Z
DTEND:20230530T163000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2347@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Paolo Torrielli (Università di Torino and INFN)\n\n
I discuss a new observable for the determination of the W mass at hadron c
olliders\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:Matteo Becchetti - Two-loop Feynman integrals for top-quark pair p
lus jet production
DTSTART:20230530T140000Z
DTEND:20230530T143000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2360@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Matteo Becchetti (University of Turin)\n\nWe report
on recent progress for the QCD corrections to top-quark pair plus jet prod
uction. In particular\, we discuss a recent computation for the two-loop m
aster integrals associated to a two-loop five-point pentagon-box integral
configuration with one internal massive propagator\, that contributes to t
op-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:Michael Borinsky - Feynman amplitudes and the moduli space of grap
hs
DTSTART:20230529T133000Z
DTEND:20230529T140000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2327@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Michael Borinsky (ETH Zürich - ITS)\n\nhttps://indi
co.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:Henrik Jessen Munch - Tropical Feynman Integration in the Physical
Region
DTSTART:20230529T160000Z
DTEND:20230529T163000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2331@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Henrik Jessen Munch (University of Padova)\n\nWe pro
pose a Monte Carlo integration algorithm for numerically evaluating Feynma
n integrals in the physical region of phase space. The algorithm is an ext
ension of the tropical integration algorithm of M. Borinsky. Starting from
the projective representation of a Feynman integral\, we implement Feynma
n's i*epsilon prescription via a suitable contour deformation\, whereafter
tropical sampling is used to approximate the value of the integral. An ac
companying public code named 'feyntrop' is introduced\, which we use to pr
esent examples between 2 and 5 loops. This work is done in collaboration w
ith M. Borinsky and F. Tellander.\n\nhttps://indico.ph.ed.ac.uk/event/118/
contributions/2331/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2331/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zeno Capatti - Exposing the threshold structure of loop integrals
DTSTART:20230530T080000Z
DTEND:20230530T083000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2336@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Zeno Capatti (ETH Zürich)\n\nhttps://indico.ph.ed.a
c.uk/event/118/contributions/2336/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2336/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gherardo Vita - Precision Standard Model Phenomenology at N3LO and
Beyond
DTSTART:20230530T150000Z
DTEND:20230530T153000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2361@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Gherardo Vita (CERN)\n\nhttps://indico.ph.ed.ac.uk/e
vent/118/contributions/2361/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2361/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xing Wang - \\epsilon-form for non-planar triangles with elliptic
curves at two loops
DTSTART:20230529T130000Z
DTEND:20230529T133000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2326@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Xing Wang (TUM)\n\nFeynman integrals beyond multiple
ploylogarithms are inevitable precision study at colliders. We use the no
n-planar triangle cross ladder at two loops as an example to show how to o
btain the \\epsilon-factorised differential equation systematically for el
liptic 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:Leonardo Vernazza - Factorization and resummation at next-to-leadi
ng power
DTSTART:20230530T133000Z
DTEND:20230530T140000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2359@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Leonardo Vernazza (INFN\, Torino)\n\nI will discuss
recent progress concerning the factorization of physical observables and t
he resummation of large logarithms at next-to-leading power\, focusing on
the loop calculation of the universal functions in which physical observab
les 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:Tongzhi Yang - Renormalization of twist-two operators in covariant
gauge to three loops in QCD
DTSTART:20230530T173000Z
DTEND:20230530T180000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2365@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Tongzhi Yang (University of Zurich)\n\nhttps://indic
o.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:Dmitry Chicherin - Pentagon Functions for One-Mass Scattering
DTSTART:20230530T090000Z
DTEND:20230530T093000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2338@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Dmitry Chicherin (LAPTh\, CNRS)\n\nhttps://indico.ph
.ed.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:Robert Szafron - Towards N3LL jet veto
DTSTART:20230531T103000Z
DTEND:20230531T110000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2372@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Robert Szafron (Brookhaven National Laboratory)\n\nI
n my talk\, I will present the calculation of the two-loop soft and beam f
unctions for the transverse-momentum distribution of the leading jet in th
e production of a colour-singlet system such as a Higgs or Z boson. This c
alculation constitutes a vital component for the resummation of the transv
erse-momentum distribution and the jet-vetoed cross-section at next-to-nex
t-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:Chiara Signorile-Signorile - Advances in the nested soft-collinear
subtraction scheme
DTSTART:20230601T150000Z
DTEND:20230601T153000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2384@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Chiara Signorile-Signorile (Karlsruhe Institute of T
echnology)\n\nIn this talk\, I will present recent progress in the general
isation of the nested soft-collinear subtraction scheme to multi-parton fi
nal state processes. The scheme has already been successfully applied to s
catterings involving a limited number of coloured partons\, and it has sho
wn remarkable flexibility and good numerical performances. I will discuss
how to overcome the difficulties that arise from going beyond the previous
implementations\, considering as a case study the vector boson production
in association with a jet at next-to-next-to-leading order in QCD.\n\nhtt
ps://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:Michał Czakon - Jet and Photon Physics at high perturbative order
s in QCD
DTSTART:20230531T110000Z
DTEND:20230531T113000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2373@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Michał Czakon (RWTH Aachen University)\n\nI will pr
esent recently published as well as yet unpublished results on multi-photo
n and multi-jet cross sections obtained with next-to-next-to-leading and p
ossibly higher order in perturbative QCD.\n\nhttps://indico.ph.ed.ac.uk/ev
ent/118/contributions/2373/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2373/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Johannes Henn - Four-dimensional integration methods for Feynman i
ntegrals
DTSTART:20230602T073000Z
DTEND:20230602T080000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2406@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Johannes Henn (Max Planck Institute for Physics\, Mu
nich)\n\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:Frank Petriello - Transverse single-spin asymmetries within and be
yond the Standard Model
DTSTART:20230601T103000Z
DTEND:20230601T110000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2379@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Frank Petriello (Northwestern University and Argonne
National Laboratory)\n\nWe discuss new observables for probing physics be
yond the SM within the framework of the Standard Model Effective Field The
ory (SMEFT). We consider both existing measurements at the LHC\, and poten
tial future ones at upcoming colliders such as the Electron-Ion Collider (
EIC).\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:Vitalii Maheria - Evaluating scattering amplitudes with pySecDec
DTSTART:20230601T130000Z
DTEND:20230601T133000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2381@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Vitalii Maheria (ITP KIT)\n\nI'd like to present the
new developments and talk about the current status of numerical evaluatio
n of multi-loop integrals and amplitudes using the new release of pySecDec
(v1.6)\, particularly concentrating on significant integration performanc
e improvements and automation related to expansion-by-regions.\n\nhttps://
indico.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:Bennie Ward - New Results from IR-Improved Amplitude-Based Resumma
tion in Quantum Field Theory
DTSTART:20230601T180000Z
DTEND:20230601T183000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2389@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Bennie Ward (Baylor University)\n\nThere is a contin
uing effort to support and prepare the precision physics programs for the
present and planned future colliders such as HL-LHC\, FCC\, CLIC\, CEPC\,
and CPPC. We discuss new results from IR-improved amplitude-based resummat
ion in quantum field theory relevant to such support and preparation with
some emphasis on the interplay between soft and collinear resummation alge
bras.\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:Sinead Farrington - Highlights from Experiment and where next for
precision
DTSTART:20230529T073000Z
DTEND:20230529T080000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2309@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Sinead Farrington\n\nhttps://indico.ph.ed.ac.uk/even
t/118/contributions/2309/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2309/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Kosower - Universal Decomposition of Phase-Space Integrands
DTSTART:20230602T100000Z
DTEND:20230602T103000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2410@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: David A Kosower (IPhT\, CEA-Saclay)\n\nOne-loop inte
grands can be written in terms of a simple\, process-independent basis. A
similar basis exists for integrands of phase-space integrals for the real-
emission contribution at next-to-leading order. The demonstration deploys
techniques from computational algebraic geometry in order to partial-fract
ion integrands in a systematic way. This provides the first step towards a
decomposition of phase-space integrals in a basis of master integrals.\n\
nhttps://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:Keith Ellis - Resummation Studies for LHC
DTSTART:20230602T110000Z
DTEND:20230602T113000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2412@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Keith Ellis (IPPP\, Durham)\n\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:Organised excursions
DTSTART:20230531T130000Z
DTEND:20230531T170000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-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:Christian Brønnum-Hansen - Non-factorisable contributions to t-ch
annel single top and VBF Higgs production
DTSTART:20230529T150000Z
DTEND:20230529T153000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2320@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Christian Brønnum-Hansen (Karlsruhe Institute of Te
chnology)\n\nIn both single top and VBF Higgs production a structure funct
ion approximation can be applied to obtain the leading colour contribution
. This approximation contains only so-called factorisable diagrams and is
exact at NLO. However\, at NNLO non-factorisable contributions come into p
lay. A particular challenge for calculations at this order is the evaluati
on of two-loop diagrams with several mass scales. In this talk I will pres
ent calculations and results for the phenomenological impact of non-factor
isable contributions in t-channel single top and VBF Higgs production.\n\n
https://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:Thomas Gehrmann - Precision QCD calculations for vector boson obse
rvables
DTSTART:20230531T083000Z
DTEND:20230531T090000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2369@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Thomas Gehrmann (University of Zurich)\n\nhttps://in
dico.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:Stefano Forte - Can we trust machine learning? PDFs as a case stud
y
DTSTART:20230529T100000Z
DTEND:20230529T103000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2314@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Stefano Forte (Universita' di Milano)\n\nI criticall
y examine issues that arise when applying modern machine learning techniqu
es in the context of precision collider physics\, by specifically consider
ing the case of PDF determinations. Questions that I address include: Can
we trust the machine learning model to correctly generalize from known exa
mples? How can we validate results\, specifically for uncertainties? Can w
e detect over- and under-learning? Can a machine learning model detect inc
onsistencies in the data that it is being shown?\n\nhttps://indico.ph.ed.a
c.uk/event/118/contributions/2314/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2314/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kirill Melnikov - Power corrections to collider processes
DTSTART:20230529T103000Z
DTEND:20230529T110000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2315@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Kirill Melnikov (TTP KIT)\n\nI will review novel de
velopments related to an analytic understanding of power corrections to co
llider 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:Stefan Weinzierl - Feynman integrals\, geometries and differential
equations
DTSTART:20230529T110000Z
DTEND:20230529T113000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2316@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Stefan Weinzierl (University of Mainz)\n\nWe may ass
ociate a geometry to a Feynman integral. Understanding the geometry helps
in computing the Feynman integral. In this talk I will discuss how Feynman
integrals related to non-trivial geometries like Calabi-Yau manifolds can
be computed with the help of the method of differential equations. In par
ticular I will discuss an ansatz\, which casts the differential equation i
nto an epsilon-factorised form.\n\nhttps://indico.ph.ed.ac.uk/event/118/co
ntributions/2316/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2316/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Federico Buccioni - Signal-background interference effects in Higg
s-mediated diphoton production beyond NLO
DTSTART:20230529T133000Z
DTEND:20230529T140000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2318@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Federico Buccioni (TUM)\n\nIn this talk I will consi
der signal-background interference effects in Higgs-mediated diphoton prod
uction at the LHC. The inclusion of such effects results in a shift of the
diphoton invariant mass distribution and in a destructive contribution to
the total cross section. As pointed out in earlier works\, one can exploi
t interference studies to put bounds on the Higgs boson decay width. After
reviewing the Higgs interferometry framework I will present an extension
of this analysis up to NNLO QCD in the soft-virtual approximation.\n\nhttp
s://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:Hjalte Frellesvig - Releative Cohomology and Feynman Integrals
DTSTART:20230529T170000Z
DTEND:20230529T173000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2332@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Hjalte Frellesvig (NBIA\, Copenhagen)\n\nI will disc
uss the use of intersection numbers computed in relative cohomologies for
the manipulation of Feynman integrals in Dimensional Regularization. This
approach has the potential to revolutionize integral reductions\, which wi
th current techniques are a significant bottleneck for phenomenologically
relevant scattering amplitude computations.\n\nhttps://indico.ph.ed.ac.uk/
event/118/contributions/2332/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2332/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ekta Chaubey - Two-loop QCD and QED corrections to light-by-light
scattering
DTSTART:20230602T090000Z
DTEND:20230602T093000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2409@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Ekta Chaubey (ekta@lpthe.jussieu.fr)\n\nIn this talk
we present the analytic results for two-loop QCD as well as QED correctio
ns to light-by-light scattering including contributions due to massive int
ernal 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:Conference Registration
DTSTART:20230528T140000Z
DTEND:20230528T190000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-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:Alexander Penin - Higgs boson production at the next-to-next-to-le
ading power
DTSTART:20230529T080000Z
DTEND:20230529T083000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2312@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Alexander Penin (University of Alberta)\n\nWe study
the amplitudes of the light quark mediated Higgs boson production via gluo
n fusion in the high-energy limit. A complete analytic result is obtained
for the three-loop $O(m_q^3)$ double-logarithmic term while and the all-or
der analysis is performed in the large-$N_c$ limit of QCD and in the abeli
an approximation.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/23
12/
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:20230529T083000Z
DTEND:20230529T090000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2310@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Gudrun Heinrich (Karlsruhe Institute of Technology)\
n\nIn the first part of the talk\, methods for the calculation of two-loop
amplitudes with several mass scales\, such as HH\, HJ or HZ production in
gluon fusion\, will be discussed. The second part will focus on Higgs bos
on pair production\, in particular the combination of NLO QCD corrections
with anomalous couplings in an Effective Field Theory framework. Predictio
ns for the Higgs boson pair invariant mass spectrum\, including leading op
erators as well as loop-suppressed operators such as 4-top-quark-operators
\, will be presented.\n\nhttps://indico.ph.ed.ac.uk/event/118/contribution
s/2310/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2310/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A.H. Ajjath - di-Higgs at N3LO+N3LL
DTSTART:20230529T140000Z
DTEND:20230529T143000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2319@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Ajjath Aabdul Hameed\n\nWe present the soft-gluon re
summation for the Higgs boson pair production in the gluon fusion channel
to the next-to-next-to-next-to-leading logarithmic(N3LL) accuracy. After m
atching N3LL to the next-to-next-to-next-to-leading order (N3LO) QCD calcu
lation in the infinite top quark mass approximation\, we show that the cen
tral values of the inclusive cross sections are quite stable with respect
to N3LO\, while the conventional renormalisation and factorisation scale u
ncertainties are reduced by a factor of two\, reaching to the subpercent l
evel. After combining with the full top-quark mass dependent next-to-leadi
ng order QCD results\, our most advanced predictions are presented for bot
h the inclusive total cross sections and the differential invariant mass d
istributions of the Higgs pair.\n\nhttps://indico.ph.ed.ac.uk/event/118/co
ntributions/2319/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2319/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bakul Agarwal - Next-to-Leading-Order QCD corrections to ZZ produc
tion through gluon fusion
DTSTART:20230529T153000Z
DTEND:20230529T160000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2321@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Bakul Agarwal (Karlsruhe Institute of Technology (IT
P))\n\nPair production of Z bosons is an essential process at the LHC. It
is a significant background to Higgs production\, and subsequent decay thr
ough the four lepton channel\, as well as an important signal process for
new physics searches. In this talk\, we present our calculation of the nex
t-to-leading order QCD corrections to Z-pair production through gluon fusi
on with full top quark mass dependence. We discuss the details of the calc
ulation of the challenging two-loop virtual amplitudes. We then present ph
enomenological results for this process.\n\nhttps://indico.ph.ed.ac.uk/eve
nt/118/contributions/2321/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2321/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luca Buonocore - Associated production of a W boson and massive bo
ttom quarks in NNLO QCD
DTSTART:20230529T160000Z
DTEND:20230529T163000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2322@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Luca Buonocore (University of Zurich)\n\nWe present
the first calculation for the production of a W boson in association with
massive bottom quarks (Wbb) at hadron colliders at next-to-next-to-leading
order (NNLO) in QCD. The use of massive bottom quarks avoids the ambiguit
ies associated with the correct flavour assignment in massless calculation
s\, paving the way to a more realistic comparison with experimental data.
The relevant five-point two-loop virtual amplitude with three massive legs
required to reach the NNLO accuracy is still not yet available. Exploitin
g the hierarchy between the bottom quark mass and the characteristic energ
y scale of the process\, a reliable expression has been obtained through a
massification procedure applied to the results available for massless bot
tom quarks. We present phenomenological results considering proton–proto
n collisions at 13.6 TeV for inclusive Wbb production and within a fiducia
l region relevant for the associated production of a W boson and a Higgs b
oson decaying into a bottom-quark pair\, for which Wbb production represen
ts one of the most relevant backgrounds. NNLO corrections are substantial
and 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:Melih Arslan Ozcelik - Two-loop master integrals and form-factors
for pseudo-scalar quarkonia
DTSTART:20230529T170000Z
DTEND:20230529T173000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2323@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Melih Arslan Ozcelik (IJCLab - CNRS/Université Pari
s-Saclay)\n\nWe compute the two-loop master integrals relevant for the NNL
O QCD correction to heavy pseudo-scalar quarkonium production and decay bo
th analytically and numerically. The analytic expressions involve elliptic
multiple polylogarithms and iterated integrals of modular forms. We discu
ss the master integral computation and the form-factors obtained. We brief
ly discuss their phenomenological importance.\n\nhttps://indico.ph.ed.ac.u
k/event/118/contributions/2323/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2323/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Narayan Rana - Mixed QCD-EW two-loop amplitudes for charged curren
t Drell-Yan production
DTSTART:20230529T173000Z
DTEND:20230529T180000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2324@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Narayan Rana (NISER Bhubaneswar)\n\nIn this talk\, w
e present the mixed QCD-EW two-loop virtual corrections for the charged cu
rrent Drell-Yan production. The presence of one additional mass compare to
the neutral current case makes the computation of the two-loop amplitudes
extremely challenging\, specially the two-loop Feynman integrals. Our app
roach to evaluate the relevant two-loop Feynman integrals using semi-analy
tical method\, allows us to obtain the renormalized two-loop amplitudes. W
e perform the subtraction of the universal infrared singularities mostly a
nalytically and present the numerical evaluation of the hard function as a
grid.\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:Chiara Savoini - ttH production in NNLO QCD
DTSTART:20230529T180000Z
DTEND:20230529T183000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2325@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Chiara Savoini (University of Zurich)\n\nThe associa
ted production of a Higgs boson with a top–antitop quark pair is a cruci
al process at the LHC since it allows for a direct measurement of the top-
quark Yukawa coupling. In this talk we will present the computation of the
radiative corrections to this process at the next-to-next-to-leading orde
r (NNLO) in QCD perturbation theory. This represents the very first comput
ation for a 2 → 3 process with massive coloured particles at this pertur
bative order. In order to overcome the bottleneck of the missing two-loop
amplitudes (which are at the frontier of current techniques)\, we develope
d a soft Higgs boson approximation\, which enabled us to reliably quantify
the impact of the yet unknown two-loop contribution. The IR-singularities
are treated within the well-established qT-subtraction framework\, proper
ly extended to the case of heavy-quark production in association with a co
lourless system.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/232
5/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2325/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oliver Schnetz - Loop calculations with graphical functions
DTSTART:20230529T140000Z
DTEND:20230529T143000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2328@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Oliver Schnetz (Friedrich-Alexander-University)\n\nW
e will provide a guided tour through the method of calculating high loop o
rder renormalization functions (7 loops $\\phi^4$\, 6 loops $\\phi^3$) wit
h graphical functions. This tour will lead through graphical functions in
even dimensions (for calculating primitive Feynman periods\, with M. Borin
sky)\, generalized single-valued hyperlogarithms (GSVHs\, a suitable funct
ion space)\, and the extension to non-integer dimensions (dimensional regu
larization). We will briefly discuss future applications to gauge theories
(most notably QED and QCD).\n\nhttps://indico.ph.ed.ac.uk/event/118/contr
ibutions/2328/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2328/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Broadhurst - 3-loop tadpoles with substructure from 12 ellip
tic curves
DTSTART:20230529T153000Z
DTEND:20230529T160000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2330@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: David Broadhurst (Open University\, UK)\n\nThe gener
ic 3-loop tetrahedral tadpole\, with 6 distinct masses\, has elliptic subt
ructure originating from 12 distinct elliptic curves. I shall show how to
evaluate it\, at high precision and great speed\, by integrating dilogarit
hms against complete integrals of the third kind\, for which there is a pr
oceudre of the arithmetic-geometric mean that is astoundingly fast. The el
ements of this method go back more 60 years\, to Gunnar Kallen and Afaf Sa
bry. I learnt about them more than 50 years from Gabriel Barton. They dese
rve to better known.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions
/2330/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2330/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xiao Liu - New tools towards fast evaluation of Feynman integrals
DTSTART:20230529T173000Z
DTEND:20230529T180000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2333@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Xiao Liu (University of Oxford)\n\nIn this talk\, I
will introduce new tools towards the evaluation of Feynman integrals\, inc
luding AMFlow and Blade. AMFlow\, based on auxiliary mass flow method\, wh
ich can numerically evaluate Feynman integrals in an efficient and systema
tic way\, have proved to be very useful in the past year. Another tool nam
ed Blade\, which is based on block-triangular relations among Feynman inte
grals\, can perform much faster samling in finite field than traditional i
ntegration-by-parts system and as a result\, much more efficient reduction
of Feynman integrals.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributio
ns/2333/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2333/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pavel Novichkov - Minimally divergent integral bases and special r
elations
DTSTART:20230529T180000Z
DTEND:20230529T183000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2334@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Pavel Novichkov (IPhT CEA/Saclay)\n\nIn multiloop co
mputations\, choosing an integral basis that minimizes infrared divergence
s holds the promise of simplifying results. I describe a procedure based o
n analysis of Landau equations for finding sets of finite integrals. The s
ame technique can also be applied to finding integrals which are manifestl
y O(ϵ). These integrals can give rise to special relations between integr
als beyond those arising from integration by parts.\n\nhttps://indico.ph.e
d.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:Alexandre Salas-Bernárdez - Flow-oriented Perturbation Theory
DTSTART:20230530T073000Z
DTEND:20230530T080000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2335@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Alexandre Salas-Bernárdez (Universidad Complutense
de Madrid)\n\nI will present flow oriented perturbation theory (FOPT)\, a
coordinate space analogue of time-ordered perturbation theory and loop-tre
e duality. Within this approach\, a generic Feynman graph is mapped to a s
um of all its possible different energy-flows respecting energy conservati
on at each vertex (strongly connected directed graphs). In the FOPT framew
ork\, 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 cancellat
ion of real and virtual singularities. Additionally\, I will present a FOP
T representation of the S-matrix that exhibits manifest infrared singulari
ty factorization on a per-diagram level.\n\nhttps://indico.ph.ed.ac.uk/eve
nt/118/contributions/2335/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2335/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ben Page - Evanescent Integrals from Local Subtraction
DTSTART:20230530T083000Z
DTEND:20230530T090000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2337@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Ben Page (CERN)\n\nEvanescent integrals are those wh
ose integrands vanish when considered on loop momentum configurations that
are strictly four-dimensional. They naturally span the space of dimension
ally-regulated integrals that are missed when performing four-dimensional
unitarity cuts. Such integrals are well understood at one loop\, where the
y give rise to the so-called "rational part" of the amplitude. In this tal
k\, we discuss a new approach to computing evanescent integrals that gener
alizes to the two-loop level. Our method makes use of the local counterter
m formalism of Anastasiou and Sterman\, which we use to show that these in
tegrals can be broken down into contributions from soft\, collinear and ul
tra-violet regions. These contributions are much simpler than the original
two-loop integral: they take the form of products of one-loop integrals\,
or one-fold integrals over one-loop integrals. To demonstrate the power o
f our approach\, we apply it to the two-loop five-point all-plus amplitude
and find that at both one and two loops the finite remainder is given by
only ultra-violet contributions.\n\nhttps://indico.ph.ed.ac.uk/event/118/c
ontributions/2337/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2337/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulio Gambuti - Five point amplitudes in full colour QCD
DTSTART:20230530T100000Z
DTEND:20230530T103000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2339@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Giulio Gambuti (University of Oxford)\n\nI will disc
uss the two-loop computation of massless QCD helicity amplitudes with five
external states and full colour dependence.\n\nhttps://indico.ph.ed.ac.uk
/event/118/contributions/2339/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2339/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rene Poncelet - NNLO QCD corrections to event-shapes at the LHC
DTSTART:20230530T103000Z
DTEND:20230530T110000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2340@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Rene Poncelet (Cambridge University Cavendish Labora
tory)\n\nMulti-jet rates at hadron colliders provide a unique possibility
for probing Quantum Chromodynamics (QCD)\, the theory of strong interactio
ns. By comparing theory predictions with collider data\, one can directly
test perturbative QCD\, extract fundamental parameters like the strong cou
pling and search for physics beyond the Standard Model. Recent development
s enabled lifting three-jet cross-sections to next-to-next-to-leading orde
r (NNLO) in QCD. I will present numerical results for three-to-two jet rat
ios and event shapes at the Large Hadron Collider (LHC). Then\, I will dis
cuss the first extraction of the strong coupling constant from event shape
s at the LHC with NNLO QCD accuracy.\n\nhttps://indico.ph.ed.ac.uk/event/1
18/contributions/2340/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2340/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simone Zoia - Two-loop five-particle scattering amplitudes
DTSTART:20230530T110000Z
DTEND:20230530T113000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2341@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Simone Zoia (University of Turin)\n\nI discuss the r
ecent advances in the computation of two-loop scattering amplitudes for fi
ve-particle processes. The latter are fundamental ingredients to obtain pr
edictions at the next-to-next-to-leading order (NNLO) in QCD for many inte
resting LHC processes. I discuss the state-of-the-art technology for compu
ting scattering amplitudes analytically\, and present new results relevant
for the LHC phenomenology.\n\nhttps://indico.ph.ed.ac.uk/event/118/contri
butions/2341/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2341/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mathieu Giroux - Looping the loops: a tale of elliptic dual Feynma
n integrals
DTSTART:20230530T130000Z
DTEND:20230530T133000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2342@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Mathieu Giroux (McGill University)\n\nMulti-loop Fey
nman integrals are the cornerstone of modern perturbative approaches to qu
antum field theory and a pillar of precision computations for colliders as
well as gravitational wave experiments. It is therefore essential to deve
lop efficient method to evaluate them. A big bottleneck in that direction
is the necessity to deal with integrals depending on many scales. In this
talk\, I will present a new method designed to handle such problem\, namel
y a loop-by-loop approach to the computation of differential equation for
(dual) Feynman integrals. As a proof of concept example\, I will discuss h
ow one can obtain a 'ready to integrate’ differential equation for the u
nequal 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:Yu Jiao Zhu - Elliptic Moduli of Bhabha Scattering
DTSTART:20230530T133000Z
DTEND:20230530T140000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2343@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Yu Jiao Zhu (Bonn University)\n\nAmplitude are geome
tric objects and we have ambitions to classify them. As functions of discr
ete indices of color\, charge\, helicity\, ...\, and spin\, they are tenso
rs on the Fock spaces of elementary particles. Linear spaces\, like the Fo
ck spaces\, they have automorphisms under which a given tensor is transfor
med into another in the equivalent class. In this sense\, equivalent class
es of tensors are orbits under the action of linear automorphism groups\,
it is thus natural to represent each equivalent class of tensors by normal
forms composed of `invariants'. E.g.\, matrices under congruence they cla
ssify $(0\,2)$-type bilinear forms\, while under similarity they classify
$(1\,1)$-type linear endomorphisms\, two such $(1\,1)$ forms are equivalen
t if and only if their corresponding characteristic matrices share the sam
e set of Smith invariant factors over a polynomial PID (principal ideal do
main). On the other hand\, amplitude in massive theory is quite often asso
ciated with families of elliptic curves parameterized by the Mandelstam va
riables. Just like automorphisms of linear spaces leads to the transformat
ion between equivalent tensors\, isomorphisms of elliptic curves lead to t
he modular transformation of the symbol letters. Just like equivalent clas
ses of tensors are represented by normal forms\, the space of equivalent c
lasses of elliptic curves are represented by fundamental domains of moduli
curves (spaces) $\\Gamma\\backslash\\mathbb{H}$. In this spirit\, we are
aimed at a classification of different scattering processes according to t
he underlying moduli space\, deriving potential dimension formulas and fun
ction bases for the symbol letters. In this talk\, I report a first step t
owards the land of amplitude beyond genus one -- the complete analytic com
putation of the 2-loop Bhabha scattering in Quantum Electrodynamics. I wil
l start from the correspondence between modular curves $\\Gamma\\backslash
\\mathbb{H}$ and elliptic moduli space with level structures\, and then us
e the sunrise family to show how we parameterize the punctured Riemann sph
ere through principal modular function\, and eventually jump over to modul
ar parameterization of elliptic K3 surface through the universal curves $\
\mathcal{E}_{\\Gamma_1(4)\\backslash\\mathbb{H}}$. I will highlight the ch
oice of a \\emph{universal rational marked point} inspired by \\textrm{Mor
dell–Weil theorem}\, and show that Bhabha scattering and planar top quar
k production at sector 79 are described by the same moduli space of $\\mat
hscr{M}_{1\;2}[4]$ with $4$-level structures\, thus should be represented
by the same class of function space.\n\nhttps://indico.ph.ed.ac.uk/event/1
18/contributions/2343/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2343/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kai Yan - Multi-point energy correlations in N=4 Super Yang-Mills
Theory
DTSTART:20230530T140000Z
DTEND:20230530T143000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2344@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Kai Yan (Shanghai Jiao Tong University)\n\nThe Energ
y Correlator observables probe the geometric distributions of energy flow
in the final states of particle scattering experiments. They provide valua
ble data for studies ranging from conformal field theories to jet substruc
ture. We present an analytic formula for the three-point energy correlator
(EEEC) at leading order (LO) in N = 4 super Yang Mills theory\, which exh
ibits unexplored simplicity and novel features in its function space. In a
ddition we introduce a new approach to obtaining higher-point correlators
in the small-angle limit from the super form factor of protected scalar op
erators. These results provide tools and experience for QCD\, which is phe
nomenologically relevant for the cutting-edge studies at LHC.\n\nhttps://i
ndico.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:Daniel Stremmer - ttjj - NLO QCD corrections to top quark pair pro
duction and decays at the LHC
DTSTART:20230530T150000Z
DTEND:20230530T153000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2345@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Daniel Stremmer (RWTH Aachen University)\n\nIn this
talk 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 use
d to model the decays of the top quark pair preserving spin correlations.
Jet radiation and QCD corrections are consistently included in the product
ion and decay of the top quarks. We discuss the size of NLO QCD correction
s and the main theoretical uncertainties of fiducial cross sections at the
integrated and differential level. In addition\, we examine the contribut
ions of jet radiation in the production and decay of the top quark pair\,
as well as the mixed contribution\, in which jet radiation is simultaneous
ly present in the production and decay stage.\n\nhttps://indico.ph.ed.ac.u
k/event/118/contributions/2345/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2345/
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:20230530T153000Z
DTEND:20230530T160000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2346@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Giovanni Pelliccioli (Max-Planck-Institut für Physi
k)\n\nThe associated production of a single top quark with a Z boson (tZj)
represents an important probe of the EW sector of the Standard Model. Sin
ce differential measurements of tZj are expected to enhance the sensitivit
y to new-physics effects\, and the experimental interest in this direction
is growing in the light of upcoming LHC runs\, it is crucial to improve t
he off-shell modelling of this process for realistic fiducial regions. We
present the first Standard-Model calculation of the off-shell tZj producti
on 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 accou
nted for\, both at LO and at NLO. Relying on a realistic fiducial volume\,
we highlight the most relevant effects coming from radiative corrections
and from irreducible-background contamination on total and differential cr
oss 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:Giuseppe Bevilacqua - Modelling uncertainties and prompt b-jet ide
ntification in ttbb with dilepton signatures at the LHC
DTSTART:20230530T170000Z
DTEND:20230530T173000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2348@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Giuseppe Bevilacqua (NCSR Demokritos)\n\nAs one of t
he 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 preci
se theoretical predictions and estimates of the dominant uncertainties. On
top of that\, the capacity of properly disentangling the prompt b-jets an
d the b-jets from top-quark decays has important phenomenological conseque
nces. In this talk we present state-of-the-art predictions for ttbb produc
tion with dilepton decays at the LHC as obtained from a full off-shell cal
culation at NLO QCD accuracy. We discuss the dominant theory uncertainties
\, assess the relevance of double-\, single- and non-resonant contribution
s and investigate the impact of different b-jet definitions on the cross s
ection. Finally we present a kinematics-based prescription to cope with th
e identification of the prompt b-jets.\n\nhttps://indico.ph.ed.ac.uk/event
/118/contributions/2348/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2348/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Manuel Egner - Semileptonic and nonleptonic b-decays at NNLO
DTSTART:20230530T180000Z
DTEND:20230530T183000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2350@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Manuel Egner (KIT)\n\nThe decay of B mesons can be d
escribed in the Heavy Quark Expansion as the decay of a free bottom quark
plus corrections which are suppressed by powers of 1/m_b. The focus of the
talk will be on the calculation of the NNLO corrections to semileptonic a
nd nonleptonic decays of a free bottom quark including a non-vanishing cha
rm quark mass. For the semileptonic decays we obtain an analytic result by
solving differential equations and fixing boundary conditions in the limi
t of a heavy charm quark. Our analytic expression can be compared to previ
ous known results obtained via expansions in the mass ratio m_c/m_b. In a
second approach we calculate precise numerical expansions of all master in
tegrals with the help of differential equations which can describe the who
le parameter space from m_c/m_b=1 to m_c/m_b=0. I will also give an outloo
k on the ongoing nonleptonic calculation\, where the same techniques as in
the semileptonic case are used.\n\nhttps://indico.ph.ed.ac.uk/event/118/c
ontributions/2350/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2350/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Arnd Behring - A first look at the two-mass QCD contributions to t
he four-loop rho parameter
DTSTART:20230530T080000Z
DTEND:20230530T083000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2352@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Arnd Behring (CERN)\n\nThe rho parameter is an impor
tant Standard Model precision observable. It is currently known to four-lo
op order in QCD in the limit of vanishing bottom quark mass. When the rho
parameter was calculated at three-loop order with exact bottom quark mass
dependence\, it was discovered that elliptic integrals enter the results.
In this talk\, we report on the status of our calculation of the rho param
eter at four-loop order in QCD with exact dependence on the bottom quark m
ass with a particular emphasis on the mathematical structure of the integr
als that enter the results.\n\nhttps://indico.ph.ed.ac.uk/event/118/contri
butions/2352/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2352/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nikolaos Syrrakos - 3-loop master integrals for H+jet production a
t N3LO: Towards the non-planar topologies
DTSTART:20230530T083000Z
DTEND:20230530T090000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2353@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Nikolaos Syrrakos (TUM)\n\nI will discuss the recent
progress that has been made towards the computation of 3-loop non-planar
master integrals relevant to N3LO corrections to processes such as H+jet p
roduction at the LHC. I will describe the analytic structure of these inte
grals as well as several technical issues regarding their analytic computa
tion using canonical differential equations. Finally I will comment on the
remaining steps towards the computation of all relevant 3-loop topologies
and 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:Kay Schönwald - Singlet and anomaly contributions to massive QCD
form factors
DTSTART:20230530T090000Z
DTEND:20230530T093000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2354@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Kay Schönwald (University of Zurich)\n\nMassive for
m factors in QCD are important building blocks in higher order corrections
to various observables like heavy quark production\, top quark decays or
muon-electron scattering\, where they describe the virtual contributions.
Furthermore\, they show universal infrared behaviour which makes them inte
resting to study also in the context of the infrared structure of QCD ampl
itudes. In this talk I will present our recent calculation of singlet and
anomaly contributions to the massive quark form factors\, which is based o
n expansions around singular and regular points of the master integrals an
d numerical matching. This completes the calculation of the massive form f
actors for external vector\, axial-vector\, scalar and pseudo-scalar curre
nts up to three-loop order.\n\nhttps://indico.ph.ed.ac.uk/event/118/contri
butions/2354/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2354/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zhewei Yin - Coupling versus kinematics in a general spontaneously
broken gauge theory
DTSTART:20230530T110000Z
DTEND:20230530T113000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2357@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Zhewei Yin (Uppsala University)\n\nThe most general
renormalizable quantum field theory one can write down for a finite spectr
um of spin-0\, 1/2\, and 1 particles is a gauge theory\, with possible spo
ntaneously broken symmetries. The existence of Lie group structures in suc
h a theory is determined by perturbative unitarity of the on-shell scatter
ing amplitudes. Armed with new tools developed for scattering amplitudes\,
we demonstrate very explicitly how broken symmetries emerge from the cons
traints of tree unitarity. Such constraints result in relations dictating
the couplings to be invariant tensors of the gauge group\, and each of the
se relations has a counterpart for kinematic numerators of on-shell amplit
udes. This facilitates the extension of color-kinematics duality to sponta
neously broken gauge theories.\n\nhttps://indico.ph.ed.ac.uk/event/118/con
tributions/2357/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2357/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ze Long Liu - Infrared singularities of QCD amplitudes with a mass
ive parton
DTSTART:20230530T130000Z
DTEND:20230530T133000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2358@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Zelong Liu (CERN)\n\nThe knowledge of infrared singu
larities of gauge-theory amplitudes enables us to systematically resum lar
ge logarithmic corrections to many important observables. In this talk\, I
will present the structure of anomalous dimensions governing infrared sin
gularities of QCD amplitudes with one massive and an arbitrary number of m
assless external partons. The analytical expression of tripole correlation
s involving one massive parton is obtained at three loops for the first ti
me. The results are essential to improve the theoretical predictions of si
ngle top and top quark pair productions at hadron colliders.\n\nhttps://in
dico.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:Yao Ma - A graph-theoretical approach to the method of regions
DTSTART:20230530T160000Z
DTEND:20230530T163000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2363@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Yao Ma (University of Edinburgh)\n\nThe method of re
gions (MoR)\, a systematic way to compute Feynman integrals involving mult
iple kinematic scales\, states that a Feynman integral can be approximated
\, and even reproduced\, by summing over integrals that are expanded in ce
rtain regions. A modern perspective of the MoR is to consider any given Fe
ynman integral as a certain Newton polytope\, which is defined as the conv
ex hull of the points associated to the terms of the Symanzik polynomials.
The regions then\, has a one-to-one correspondence to the "lower facets"
of this polytope. Since the Symanzik polynomials are further related to th
e spanning trees and spanning 2-trees of the Feynman graph\, a graph-theor
etical study of these polynomials may allow us to unveil all the possible
regions that are needed in the MoR. In this talk we mainly focus on three
specific expansions of the wide-angle scattering process: the on-shell exp
ansion\, threshold expansion and mass expansion. After introducing the bac
kground knowledge\, we will describe the basic strategy of the grah-theore
tical approach\, and formulate the generic form of the regions appearing i
n each of the three expansions above. The results\, which hold for graphs
at all orders\, can be further applied to construct graph-finding algorith
ms for the MoR\, and investigate the properties of the Soft-Collinear Effe
ctive Theory (SCET).\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions
/2363/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2363/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Pelloni - Four-loop large-nf contributions to the non-singl
et structure functions
DTSTART:20230530T180000Z
DTEND:20230530T183000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2366@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andrea Pelloni (Nikhef)\n\nWe have calculated the $n
_f^2$ and $n_f^3$ contributions to the flavour non-singlet structure funct
ions $F_2$ and $F_L$ and most recently $F_3$ in inclusive deep-inelastic s
cattering at the fourth order in the strong coupling $\\alpha_s$. The coef
ficient functions have been obtained by computing a very large number of M
ellin-N moments using the method of differential equations\, and then dete
rmining the analytic forms in N and Bjorken-x from these. Our new $n_f^2$
terms are numerically much larger than the n3f leading large-nf parts whic
h were already known\; they agree with predictions of the threshold and hi
gh-energy resummations. Furthermore\, our calculation confirms the earlier
determination of the four-loop $n_f^2$ part of the corresponding anomalou
s 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:Sebastian Mizera - Landau Singularities Revisited
DTSTART:20230531T080000Z
DTEND:20230531T083000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2368@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Sebastian Mizera (Perimeter Institute for Theoretica
l Physics)\n\nLandau analysis aims to predict the singularity structure of
Feynman integrals without their explicit evaluation. We point out a numbe
r of errors in its textbook formulation that prevented applications to the
Standard Model processes in the past. After resolving these issues\, we u
se a combination of tropical analysis and numerical algebraic geometry to
implement an algorithm that classifies and consistently finds all possible
singularities of multi-loop Feynman integrals.\n\nhttps://indico.ph.ed.ac
.uk/event/118/contributions/2368/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2368/
END:VEVENT
BEGIN:VEVENT
SUMMARY:HuaXing Zhu - Power corrections to energy flow distribution meets
conformal bootstrap
DTSTART:20230531T090000Z
DTEND:20230531T093000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2370@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: HuaXing Zhu (Zhejiang University)\n\nDynamics of hig
h energy scattering in QCD are primarily probed through detector energy fl
ow correlations. One important IRC safe energy-flow observable is the Ener
gy-Energy Correlator (EEC). At leading power approximation in the back-to-
back limit\, EEC enjoys a factorization formula similar to the Drell-Yan p
roduction at small transverse momentum. Therefor studying the power correc
tions to EEC provides valuable insight to power corrections to Drell-Yan p
roduction. In this talk I will introduce a novel method to calculate power
corrections to EEC by exploiting the power of conformal symmetry. I will
show that there is a close correspondence between power corrections on one
side\, and twist and large spin perturbation in the operator product expa
nsion of local correlator on the other side. I will demonstrate the method
by computing the first NLP resummation for EEC.\n\nhttps://indico.ph.ed.a
c.uk/event/118/contributions/2370/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2370/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Piotr Bargiela - Three-loop four-particle QCD amplitudes
DTSTART:20230530T153000Z
DTEND:20230530T160000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2362@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Piotr Bargiela (University of Oxford)\n\nScattering
amplitudes are the fundamental building blocks of collider observables. Co
mparing high precision measurements with theory predictions requires compu
ting them to high perturbative order. The growth in the number of loops si
gnificantly increases the complexity of the problem. Using novel methods a
llowed us to compute QCD corrections to four-point massless processes at t
he state-of-the-art three-loop order. In this talk\, I will argue that emp
loying a recently proposed projector method reduces the amount of independ
ent Lorentz tensor structures. I will also discuss the derivation of a com
plete set of Master Integrals in all the relevant physical regions. It is
based on regularity properties of the underlying Feynman integrals\, which
were observed before. I will present our results for the diphoton product
ion in gluon fusion channel. Finally\, I will show an application of this
amplitude to LHC phenomenology. This particular process is a leading backg
round for Higgs production in the discovery channel. Because of the interf
erence with the signal\, it can put new bounds on the Higgs width.\n\nhttp
s://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:Andre Hoang - Calibration of the MC top quark mass parameter with
variable parton shower cut-off
DTSTART:20230601T073000Z
DTEND:20230601T080000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2374@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andre Hoang (University of Vienna)\n\nIn a recent wo
rk by Hoang\, Plätzer and Samitz is has been shown at the parton level th
at the relation top quark mass in MC event generators to a well-defined re
normalization scheme depends on the parton shower cutoff. Still\, it has n
ot been known to which extent the hadronization model may affect this rela
tion and how much this relation depends on the MC event generator and the
NLO matching scheme. Given the current uncertainties from direct measureme
nts of well below 400 MeV this issue becomes increasingly important. In th
e presentation the discussion is extended to the hadron level \, also show
ing new results based on a novel cluster hadronziation model in the Herwig
event generator. The results represent an important additional step towar
ds assigning a definite scheme to the MC top mass parameter.\n\nhttps://in
dico.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:Ludovic Scyboz - Matching and parton-shower accuracy
DTSTART:20230601T080000Z
DTEND:20230601T083000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2375@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Ludovic Scyboz (University of Oxford)\n\nIn this tal
k I investigate the interplay of NLO matching and next-to-leading-logarith
mic (NLL) parton showers in the context of two-body decays. Three matching
schemes have been implemented in the NLL-accurate PanScales showers: a mu
ltiplicative scheme\, MC@NLO and POWHEG. By means of both analytic and num
erical arguments\, I show how these retain the shower’s NLL accuracy\, a
nd (under certain provisions in the case of POWHEG) can augment it so that
it achieves NNDL accuracy for global event shapes. The talk will also bri
efly explore some phenomenological considerations.\n\nhttps://indico.ph.ed
.ac.uk/event/118/contributions/2375/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2375/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Peter Skands - NNLO Corrections in Sector Showers
DTSTART:20230601T083000Z
DTEND:20230601T090000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2376@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Peter Skands (Monash University)\n\nI will describe
recent progress on sector showers that consistently incorporate second-ord
er "direct" 2->4 branchings. These showers are able to reproduce the full
singularity structure of QCD through NNLO and can be matched in a very nat
ural and fully differential way to calculations at this accuracy\, provide
d that consistent "Born-local" K-factors can be defined. The method appear
s 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:Silvia Zanoli - Combining NNLO QCD and NLO EW corrections matched
to parton showers for WZ production using MiNNLOPS
DTSTART:20230601T090000Z
DTEND:20230601T093000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2377@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Silvia Zanoli (Max-Planck-Institut für Physik)\n\nI
n view of the increasing level of precision of current and future experime
ntal measurements\, matching NNLO QCD and NLO EW corrections represents a
crucial step for LHC phenomenology. Furthermore\, complementing fixed-orde
r perturbative computations with parton-shower effects is indispensable fo
r a realistic description of LHC processes. In this talk we present the co
mputation of WZ production at NNLO QCD and NLO EW consistently matched to
parton showers using the MiNNLOPS method. We investigate different combina
tion schemes based on an a-posteriori recombination of QCD and EW contribu
tions\, showing that the inclusion of EW effects gives sizable effects. We
also comment on the possibility of extending the MiNNLOPS method towards
the inclusion of NLO EW corrections avoiding an a-posteriori reweighting o
f simulated events.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/
2377/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2377/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesco Giovanni Celiberto - NLL/NLO studies on Higgs-plus-jet p
roduction with POWHEG+JETHAD
DTSTART:20230601T150000Z
DTEND:20230601T153000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2378@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN
-TIFPA)\n\nRecent analyses on high-energy inclusive Higgs-boson rates in p
roton collisions via the gluon fusion channel\, matched with the state of-
the-art fixed-order N3LO accuracy\, have shown that the impact of high-ene
rgy resummation corrections reaches 10% at the FCC nominal energies. This
supports the statement that electroweak physics at 100 TeV is expected to
receive relevant contributions from small-x physics. In this talk we will
present novel predictions for transverse-momentum and rapidity distributio
ns sensitive the inclusive emission of a Higgs boson in association with a
light-flavored jet in proton collisions\, calculated within the NLL accur
acy of the energy-logarithmic resummation as implemented in the JETHAD cod
e and matched with NLO fixed-order computations from POWHEG. According to
our knowledge\, this represent a first and novel implementation of a match
ing procedure in the context of the high-energy resummation for rapidity-s
eparated two-particle final states. We come out with the message that the
improvement of fixed-order calculations on Higgs-plus-jet QCD distribution
s is a core ingredient to reach the precision level of the description of
observables relevant for the Higgs physics at current LHC energies as well
as at nominal FCC ones.\n\nhttps://indico.ph.ed.ac.uk/event/118/contribut
ions/2378/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2378/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leonardo Di Giustino - Elimination of QCD Renormalization Scale an
d Scheme Ambiguities
DTSTART:20230601T110000Z
DTEND:20230601T113000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2380@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Leonardo Di Giustino (Insubria and INFN)\n\nThe reno
rmalization scale setting in QCD is a fundamental problem for high precisi
on tests of the Standard Model (SM). It is considered a conventional pract
ice to set the renormalization scale to the typical scale of a process Q\,
namely to the momentum transfer and to determine theoretical errors by va
rying it in a range of two. According to the Conventional Scale Setting (C
.S.S.)\, perturbative QCD ( pQCD) predictions are affected by the renormal
ization scheme and scale ambiguities. The Principle of Maximum Conformalit
y (PMC) provides a systematic way to remove such ambiguities from perturba
tive calculations satisfying at once the renormalization group invariance
and the self-consistency conditions deriving from the renormalization grou
p. We present here the recent developments and applications of the PMC met
hod also showing the comparison of the results with those obtained with ot
her 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:Gloria Bertolotti - Subtracting NNLO singularities with a fully ge
neral analytic algorithm in massless QCD
DTSTART:20230601T133000Z
DTEND:20230601T140000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2382@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Gloria Bertolotti (University of Turin)\n\nThis talk
presents the construction of the NNLO subtraction formula for the cancell
ation of IR singularities obtained within the framework of Local Analytic
Sector Subtraction. Such general program has been (so far) completed for t
he treatment of unresolved radiation in processes featuring any partonic f
inal state in massless QCD. The outcome of the subtraction is a compact an
d analytic expression suitable for direct numerical implementation\, thus
enabling the production of relevant phenomenological results. Updated deve
lopments 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/contr
ibutions/2382/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2382/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Marcoli - N3LO Antenna Functions for Final-State Radiation
DTSTART:20230601T140000Z
DTEND:20230601T143000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2383@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Matteo Marcoli (University of Zurich)\n\nIn the past
decade the antenna subtraction method has been successfully implemented t
o compute Next-to-Next-to-Leading Order (NNLO) corrections in QCD for a se
ries of relevant processes. In this talk we discuss the first steps toward
s the extension of this method at Next-to-Next-to-Next-to-Leading Order (N
3LO). In particular\, the calculation of N3LO antenna functions for final
state radiation is presented\, where each configuration of hard radiators
(quark-antiquark\, gluon-gluon\, quark-gluon) is suitably decomposed into
partonic sub-processes. Unintegrated antenna functions are directly extrac
ted from physical squared matrix elements\, while their integrated counter
parts are obtained relating inclusive phase space integrals to unitarity c
uts of massless four-loop integrals. We conclude commenting how the newly
computed antenna functions would fit in the context of a local N3LO subtra
ction 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:Marco Rocco - Muon-electron scattering at NNLO with McMule
DTSTART:20230601T160000Z
DTEND:20230601T163000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2385@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Marco Rocco (Paul Scherrer Institut)\n\nA recently p
roposed experiment\, MUonE\, aims to extract the hadronic vacuum polarisat
ion contribution to the muon g-2 from muon-electron scattering at low ener
gy. The extrapolation requires that both experimental and theoretical unce
rtainties do not exceed 10 ppm. This corresponds\, at least\, to next-to-n
ext-to leading order QED corrections to $e\\mu \\to e\\mu$. I will discuss
the implementation of a Monte Carlo generator for this process in the McM
ule framework\, which provides infrared-safe differential results at said
order in QED. An approximation of the MUonE setup provides some phenomenol
ogical results and sheds light on the need for higher-order corrections\,
which 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:Yannick Ulrich - QED at NNLO and beyond for precision experiments
DTSTART:20230601T153000Z
DTEND:20230601T160000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2386@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Yannick Ulrich (University of Durham)\n\nLow-energy
experiments allow for some of the most precise measurements in particle ph
ysics\, such as g-2. To make the most of these experiments\, theory needs
to match the experimental precision. Over the last decade\, this meant tha
t even in QED next-to-next-to-leading order calculations (or even more in
some cases) became necessary. I will discuss some of the challenges faced
when dealing with QED corrections and discuss some possible solutions that
we have implemented in McMule (Monte Carlo for MUons and other LEptons).
McMule is a framework that we have developed to obtain NNLO predictions fo
r a number of processes\, such as $e\\mu \\to e\\mu$\, $ee \\to ee$ and $\
\mu \\to e\\nu\\bar\\nu$.\n\nhttps://indico.ph.ed.ac.uk/event/118/contribu
tions/2386/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2386/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oscar Braun-White - A general algorithm to build real-radiation an
tenna functions for higher-order calculations
DTSTART:20230601T170000Z
DTEND:20230601T173000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2387@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Oscar Braun-White (IPPP Durham University)\n\nThe an
tenna subtraction method has been successfully applied to a wide range of
processes relevant for the Large Hadron Collider at next-to-next-to-leadin
g order in $\\alpha_s$ (NNLO). We propose an algorithm for building antenn
a functions for any number of real emissions directly out of the unresolve
d limits we require. Antenna functions of this kind always identify two ha
rd radiators. We then use the algorithm to explicitly build all single- an
d double-real QCD antenna functions and compare them to the previous anten
na functions\, which were extracted from matrix elements. These antenna fu
nctions should be more easily applicable to NNLO subtraction terms than pr
eviously. Finally\, we match the integration of the antenna functions over
the final-final unresolved phase space to the previous incarnation\, serv
ing as an independent check on our results.\n\nhttps://indico.ph.ed.ac.uk/
event/118/contributions/2387/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2387/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Boris Kopeliovich - Abundant radiation of soft photons: a puzzle l
asting 40 years
DTSTART:20230601T173000Z
DTEND:20230601T180000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2388@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Boris Kopeliovich (UTFSM\, Valparaiso)\n\nThe anomal
ous excess of soft photons radiated in inelastic hadronic collisions\, has
been challenging the physics community over four decades\, but no solutio
n was proposed so far. We argue that the problem is rooted in comparison w
ith an incorrect model for radiative corrections\, usually called bremsstr
ahlung model. It is based on an illegitimate extension of the Low theorem
to radiative multi-particle production processes 2 → n + γ. We demonstr
ate that this breaks down unitarity of the S-matrix in contradiction with
the optical theorem. We propose an alternative description of photon radia
tion within the light-front color-dipole phenomenology. The results of cal
culations are in a good accord with available data.\n\nhttps://indico.ph.e
d.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:Dhimiter Canko - Two-Loop Amplitude Reduction using HELAC
DTSTART:20230601T073000Z
DTEND:20230601T080000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2390@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Dhimiter Canko (NSCR "Demokritos")\n\nWe present an
extension of HELAC for two-loop amplitudes. All basic two-loop topologies
(Theta\, Infinity\, Dumbbell) are included in the skeleton construction. F
or colored particles\, the color-connection representation is extended to
two loops offering a unified framework for tree-order\, one- and two-loop
amplitudes. HELAC-2LOOP provides\, at the moment\, an automated algorithm
capable to compute two-loop amplitudes at the integrand level. Several tes
ts have been performed regarding 2-to-2 and 2-to-3 processes against publi
cally available packages such as QGRAF\, FeynArts\, FeynCalc\, and FORM. T
he 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:Pia Bredt - A generic NLO SM framework for LHC and future collider
processes
DTSTART:20230601T080000Z
DTEND:20230601T083000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2391@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Pia Bredt (University of Siegen)\n\nIn this talk I w
ill present an automated framework calculating NLO corrections in the full
SM for arbitrary processes at hadron and lepton colliders. This framework
is an element of the Monte-Carlo program WHIZARD simulating cross section
s and differential distributions. The generalization of the implemented FK
S scheme to systematically subtract QED and QCD infrared divergences in mi
xed coupling expansions will be discussed. Also\, recent progress of the P
OWHEG-matched event generation and the inclusion of electroweak correction
s in future lepton collider processes are subjects of this talk. In partic
ular\, results of our recent study will be shown applying EW corrections t
o multi-boson processes at a future multi-TeV muon collider.\n\nhttps://in
dico.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:Julia Karlen - Locally finite two-loop amplitudes for multiple Hig
gs boson production in gluon fusion
DTSTART:20230529T130000Z
DTEND:20230529T133000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2317@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Julia Karlen (ETH Zurich)\n\nIn this talk I will des
cribe the construction of local infrared counterterms to remove all infrar
ed singularities in two-loop amplitudes for gluon-fusion processes to colo
urless final states. The counterterms are given as form-factor integrands
whose integrals are known and the number of such counterterms are very sma
ll compared to the number of diagrams involved. This procedure is based on
the universality of infrared singularities. Removing ultraviolet countert
erms results in a locally finite amplitude\, which admits numerical integr
ation in momentum space.\n\nhttps://indico.ph.ed.ac.uk/event/118/contribut
ions/2317/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2317/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jonathan Gaunt - Two-loop splitting in double parton distributions
DTSTART:20230601T090000Z
DTEND:20230601T093000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2393@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Jonathan Gaunt (University of Manchester)\n\nDouble
parton scattering (DPS) is the process in which one has two hard scatterin
gs in an individual proton-proton collision. It can compete in rate with s
ingle scattering in certain kinematic regions and/or for certain processes
\, and reveals information on nucleon structure not accessible in single p
arton scattering: spatial\, spin\, and colour correlations between the par
tons inside the nucleon. The parton densities relevant to DPS are the doub
le parton distributions (DPDs)\; at small distance between the two probed
partons the DPDs can be computed in perturbation theory. I discuss this pe
rturbative calculation at next-to-leading order – this is the key missin
g piece required for computations of DPS at NLO. The calculation for both
the colour-singlet and colour-correlated DPDs will be covered – in the l
atter case\, one encounters rapidity divergences\, the treatment of which
I will discuss in detail. We used two different regulator schemes\, the δ
regulator and Collins' regulator using space-like Wilson lines\, and obta
ined identical results in both\, providing a strong cross-check. To our kn
owledge this is the first application of the Collins regulator in a two-lo
op 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:Philipp Böer - $B_c \\to \\eta_c$ Form Factors in the Double-Loga
rithmic Approximation
DTSTART:20230601T103000Z
DTEND:20230601T110000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2395@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Philipp Böer (University of Mainz)\n\nUsing diagram
matic resummation techniques\, I discuss the double logarithmic series of
B_c to eta_c form factors at large hadronic recoil. In the non-relativisti
c limit\, mb >> mc >> LambdaQCD\, this process provides one of the simples
t setups to study the problem of endpoint singularities appearing in the S
CET factorization of exclusive B decay amplitudes in a perturbative framew
ork. The leading double logarithms arise from a peculiar interplay of ener
gy-ordered ladder diagrams -- for which an RGE treatment using effective T
heories is currently unknown -- as well as Standard Sudakov-type correctio
ns.\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:Jeppe Andersen - Next-to-leading high energy logarithmic correctio
ns and their impact on ratios of jet multiplicities
DTSTART:20230601T133000Z
DTEND:20230601T140000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2398@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Jeppe Andersen (IPPP\, Univ. of Durham)\n\nWe presen
t high energy next-to-leading logarithmic corrections\, their inclusion wi
thin the framework of High Energy Jets\, and their impact on the stabilisa
tion 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:Andreas Maier - High-energy resummation for Higgs boson plus jets
production
DTSTART:20230601T140000Z
DTEND:20230601T143000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2399@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andreas Maier (DESY)\n\nAt high energies\, fixed-ord
er predictions for the production of a Higgs boson together with one or mo
re jets suffer from large logarithms in invariant masses over transverse m
omenta. We resum these high-energy logarithms to all orders within the Hig
h Energy Jets (HEJ) framework\, retaining the exact dependence on the top-
quark mass. We compare our predictions to ATLAS and CMS measurements at 8
and 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:Michael Fucilla - High-energy resummation in Higgs production at n
ext-to-leading order
DTSTART:20230601T100000Z
DTEND:20230601T103000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2400@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Michael Fucilla (Università della calabria)\n\nPrec
ision physics in the Higgs sector has been one of the main challenges in r
ecent years. The pure fixed-order calculations entering in the \\textit{co
llinear factorization} framework\, which have been pushed up to N3LO\, are
not able to describe the entire kinematic spectrum. In particular conditi
ons\, they must be necessarily supplemented by all-order \\textit{resummat
ions}\; for instance\, in the so called \\textit{Regge} kinematical region
\, large energy-type logarithms spoil the perturbative behavior of the ser
ies and must be resummed to all orders. This resummation is necessary to d
escribe the inclusive hadroproduction of a forward Higgs in the limit of s
mall Bjorken $x$\, as well to study inclusive forward emissions of a Higgs
boson in association with a backward identified object. A complete resumm
ation for these processes\, at next-to-leading logarithmic accuracy (NLLA)
\, can be achived through the Balitsky-Fadin-Kuraev-Lipatov (BFKL) approac
h\, but it requires the knowledge of the next-to-leading order Higgs impac
t factor. We present the full NLO result for the impact factor of a forwar
d Higgs boson\, obtained in the infinite top-mass limit\, both in the mome
ntum representation and as superposition of the eigenfunctions of the LO B
FKL kernel. We also discuss the application of the result to the inclusive
hadroproduction of a Higgs boson in association with a jet.\n\nhttps://in
dico.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:Andrzej Czarnecki - Radiative corrections to mechanical properties
of bound states
DTSTART:20230601T170000Z
DTEND:20230601T173000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2403@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Andrzej Czarnecki (University of Alberta)\n\nThis ta
lk will present radiative corrections and their interpretation for the so-
called D-term. This is related to the Electron-Ion Collider project\, wher
e Generalized Parton Distributions (GPD) will be measured. GPD give access
to matrix elements of the energy-momentum tensor of a nucleon. The D-term
is sometimes roughly interpreted as characterizing pressure distribution.
Calculated it in simple bound states such as the hydrogen atom it exhibit
s an interesting new type of a log correction that resembles the Lamb shif
t 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 Ruf - Classical scattering at high orders in perturbation
theory
DTSTART:20230601T180000Z
DTEND:20230601T183000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2405@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Michael Ruf (UCLA)\n\nThe gravitation binary problem
and the associated production of gravitational waves can be treated effic
iently within the framework of quantum field theory. This allows to make u
se of a variety of tools ranging from double copy relations between gauge
theory and gravity to methods from effective field theory and multi-loop i
ntegration. I will show recent progress in applying this approach to state
-of-the art problems in classical perturbation theory and will highlight t
he fruitful interplay with other more traditional approaches to the binary
problem.\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:Silvia Ferrario Ravasio - Pushing the accuracy of parton showers f
or hadron colliders
DTSTART:20230602T103000Z
DTEND:20230602T110000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2411@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Silvia Ferrario Ravasio (CERN)\n\nShower Monte Carlo
generators simulate fully realistic collider events\, and reproduce much
of the data from the LHC and its predecessors. Their core is represented b
y Parton Shower~(PS) algorithms\, which provide the inclusion of soft radi
ation and enable us to mimic a realistic high-multiplicity collider event.
The flexibility of these tools comes at a cost of a lower accuracy\, whic
h can lead to large systematic uncertainties and compromise the physics po
tential of the LHC and future colliders. In this talk I will discuss the c
riteria introduced by the PanScales collaboration to assess the logarithmi
c accuracy of PS's. I will also show new results for the PanScales dipole
showers\, which represent the first family of dipole showers with demonstr
ated NLL accuracy for Drell-Yan and gluon-fusion production at hadron coll
iders.\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:Aparna Sankar - Next-to-soft resummation for colour singlet proces
ses at the LHC
DTSTART:20230601T083000Z
DTEND:20230601T090000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2392@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Aparna Sankar (Technical University of Munich\, Depa
rtment of Physics)\n\nIn this talk\, I will discuss a framework that resum
s soft (logarithms ln^k(N) in Mellin space) and next-to-soft (power-suppre
ssed terms ln^k(N)/N in Mellin space) logarithms to all orders in perturba
tive QCD. We use the concepts of collinear factorisation and renormalisati
on group invariance to achieve this. The former allows one to define a sof
t-collinear (SC) function that encapsulates soft and collinear dynamics of
the perturbative results to all orders in the strong coupling constant. T
he logarithmic structure of these results is governed by universal infrare
d anomalous dimensions and process-dependent functions of the Sudakov diff
erential equation that the SC satisfies. The solution to the differential
equation is obtained by proposing an all-order ansatz in dimensional regul
arization\, owing to several state-of-the-art perturbative results availab
le to third order. Using this framework we study the numerical impact of r
esumming the NSV logarithms in the context of Drell-Yan and Higgs boson pr
oduction 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\, 23
4\, Eur.Phys.J.C 82 (2022) 9\, 774 \, Phys.Rev.D 106 (2022) 3\, 034005\, h
ep-ph/2205.11560.\n\nhttps://indico.ph.ed.ac.uk/event/118/contributions/23
92/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2392/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Martin Beneke - Gradient flow renormalon subtraction and the hadro
nic tau decay series
DTSTART:20230531T100000Z
DTEND:20230531T103000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2371@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Martin Beneke (Technische Universität München)\n\n
We subtract the gluon-condensate renormalon singularity in the Adler funct
ion\, which causes the discrepancy between fixed-order (FOPT) and contour-
improved perturbation theory (CIPT)\, employing the gradient flow action d
ensity. The scheme leads to automatic subtraction\, does not require knowl
edge of the Stokes constant (renormalon residue)\, and relates to a non-pe
rturbatively defined cut-off gluon condensate. Unlike unsubtracted perturb
ation theory\, FOPT and CIPT give consistent results for the inclusive had
ronic 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
/118/contributions/2371/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2371/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastian Jaskiewicz - High-Energy and Soft-Collinear Resummation
for Jet Production at the LHC
DTSTART:20230601T153000Z
DTEND:20230601T160000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2401@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Sebastian Jaskiewicz (Durham University IPPP)\n\nIn
this talk I will present the method to merge the resummation of high energ
y logarithms implemented in High Energy Jets (HEJ) partonic Monte Carlo fr
amework with the soft-collinear effects described by the Pythia parton sho
wer. The method preserves the accuracy of the leading order cross sections
and the logarithmic accuracy of both resummation schemes across all of ph
ase space. I will show predictions obtained within this framework and comp
are to data from experimental studies.\n\nhttps://indico.ph.ed.ac.uk/event
/118/contributions/2401/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2401/
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:20230530T170000Z
DTEND:20230530T173000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2364@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Federica Devoto (University of Oxford)\n\nIn this ta
lk\, I will present a calculation of the NNLO mixed QCD-EW corrections to
the neutral-current Drell-Yan production of a pair of massless leptons in
the high invariant-mass region. Our computation is fully differential with
respect to the final state particles.\nWe find that the mixed corrections
corrections are larger than what one would expect based on the magnitude
of the coupling constants\, and they can exceed the pure NNLO QCD contribu
tion in a large portion of the phase space. At relatively low values of th
e dilepton invariant mass\, mll \\sim 200 GeV\, we find unexpectedly large
mixed QCD-electroweak corrections at the level of -1%. In the TeV region\
, we observe that these corrections can be well approximated by the produc
t of QCD and electroweak corrections\, as expected from Sudakov factorisat
ion.\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:Federico Gasparotto - Lattice Correlation functions from different
ial equations
DTSTART:20230529T150000Z
DTEND:20230529T153000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2329@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Federico Gasparotto (JGU Mainz)\n\nWe will discuss h
ow methods developed in the context of perturbation theory can be applied
to the computation of lattice correlation functions\, in particular in the
non-perturbative regime. The techniques we will consider are integration-
by-parts identities and the method of differential equations\, cast in the
framework of twisted Co-Homology. We will report on calculations of corre
lation functions for phi^4 theory and lattices of small size\, both in Euc
lidean and Minkowskian signature.\n\nhttps://indico.ph.ed.ac.uk/event/118/
contributions/2329/
LOCATION:Ferntower Suite
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2329/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calum Milloy - Regge poles and Regge cuts in multi-leg QCD amplitu
des
DTSTART:20230601T130000Z
DTEND:20230601T133000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2397@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Calum Milloy (University of Turin)\n\nScattering amp
litudes greatly simplify in the Regge limit\, and yet exhibit a very inter
esting structure\, which is far richer in the full gauge theory than in th
e planar limit. Prior to the development of QCD\, Regge and others showed
that the asymptotic high-energy behaviour of amplitudes is governed by pol
es and cuts in the complex angular momentum plane. It was also shown (Mand
elstam\, 1963) that Regge cuts emerge from non-planar diagrams. Here we ex
plore the separation between Regge poles and cuts in perturbative QCD usin
g rapidity evolution equations. We study Regge-pole factorisation in 2 \\t
o n gauge theory amplitudes in multi-Regge kinematics\, whose parameters\,
the impact factors\, the trajectory and the Lipatov vertex\, can be fully
determined from 2 \\to 2 and 2 \\to 3 amplitudes. The factorisation is br
oken at Next-to-Next-to-Leading-Logarithmic (NNLL) accuracy by the appeara
nce of a Regge cut owing to multiple Reggeon exchange in the $t$ channel.
We compute the multiple Reggeon exchange contributions through four loops
and show how to define the NNLL Regge-pole parameters in the presence of a
Regge cut\, maintaining the non-planar nature of the cut as well as the u
niversality of the Regge pole parameters. Remarkably\, this separation bet
ween pole and cuts directly leads to the generalization of the Korchemsky-
Korchemskaya relation between the singularities of the gluon Regge traject
ory 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:Lorenzo Magnea - Differential equations for parametrised Feynman i
ntegrals
DTSTART:20230531T073000Z
DTEND:20230531T080000Z
DTSTAMP:20240910T183100Z
UID:indico-contribution-2367@indico.ph.ed.ac.uk
DESCRIPTION:Speakers: Lorenzo Magnea (University of Torino)\n\nFollowing u
p on some distant and little-known papers by Tullio Regge and collaborator
s\, I will present an approach to integration-by-parts identities and diff
erential equations for Feynman integrals\, based on the Feynman parameter
representation\, and relying upon the projective nature of parameter integ
rands. A very general identity connecting projective forms allows to move
across families of Feynman integrals\, unifying IBP identities and dimensi
onal shifts\, and feeding into systems of differential equations\, similar
but not identical to the conventional ones. I will illustrate the results
with simple examples at one and two loops.\n\nhttps://indico.ph.ed.ac.uk/
event/118/contributions/2367/
LOCATION:Drawing Room
URL:https://indico.ph.ed.ac.uk/event/118/contributions/2367/
END:VEVENT
END:VCALENDAR