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28/05/2023, 15:00
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Sinead Farrington29/05/2023, 08:30
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Alexander Penin (University of Alberta)29/05/2023, 09:00
We study the amplitudes of the light quark mediated Higgs boson production via gluon 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-order analysis is performed in the large-$N_c$ limit of QCD and in the abelian approximation.
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Gudrun Heinrich (Karlsruhe Institute of Technology)29/05/2023, 09:30
In 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 boson pair production, in particular the combination of NLO QCD corrections with anomalous couplings in an Effective Field Theory framework. Predictions for the Higgs boson pair...
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Bernhard Mistlberger (SLAC)29/05/2023, 10:00
Kinematic expansions of scattering cross sections provide powerful methods of approximating key LHC observables to a high degree of precision at reduced degree of complexity in comparison to a full computation. I will show several recent advancements and examples in the development and application of collinear expansion techniques.
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Stefano Forte (Universita' di Milano)29/05/2023, 11:00
I critically examine issues that arise when applying modern machine learning techniques in the context of precision collider physics, by specifically considering the case of PDF determinations. Questions that I address include: Can we trust the machine learning model to correctly generalize from known examples? How can we validate results, specifically for uncertainties? Can we detect over-...
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Kirill Melnikov (TTP KIT)29/05/2023, 11:30
I will review novel developments related to an analytic understanding of power corrections to collider processes in the context of renormalon calculus.
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Stefan Weinzierl (University of Mainz)29/05/2023, 12:00
We may associate 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 particular I will discuss an ansatz, which casts the differential equation into an...
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Julia Karlen (ETH Zurich)29/05/2023, 14:00
In this talk I will describe the construction of local infrared counterterms to remove all infrared singularities in two-loop amplitudes for gluon-fusion processes to colourless final states. The counterterms are given as form-factor integrands whose integrals are known and the number of such counterterms are very small compared to the number of diagrams involved. This procedure is based on...
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Xing Wang (TUM)29/05/2023, 14:00
Feynman integrals beyond multiple ploylogarithms are inevitable precision study at colliders. We use the non-planar triangle cross ladder at two loops as an example to show how to obtain the \epsilon-factorised differential equation systematically for elliptic Feynman integrals depending on one dimensionless kinematic variable.
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Federico Buccioni (TUM)29/05/2023, 14:30
In this talk I will consider signal-background interference effects in Higgs-mediated diphoton production 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 exploit interference studies to put bounds on the Higgs boson decay width. After...
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Michael Borinsky (ETH Zürich - ITS)29/05/2023, 14:30
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Ajjath Aabdul Hameed29/05/2023, 15:00
We present the soft-gluon resummation for the Higgs boson pair production in the gluon fusion channel to the next-to-next-to-next-to-leading logarithmic(N3LL) accuracy. After matching N3LL to the next-to-next-to-next-to-leading order (N3LO) QCD calculation in the infinite top quark mass approximation, we show that the central values of the inclusive cross sections are quite stable with respect...
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Oliver Schnetz (Friedrich-Alexander-University)29/05/2023, 15:00
We will provide a guided tour through the method of calculating high loop order renormalization functions (7 loops $\phi^4$, 6 loops $\phi^3$) with graphical functions. This tour will lead through graphical functions in even dimensions (for calculating primitive Feynman periods, with M. Borinsky), generalized single-valued hyperlogarithms (GSVHs, a suitable function space), and the extension...
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Christian Brønnum-Hansen (Karlsruhe Institute of Technology)29/05/2023, 16:00
In both single top and VBF Higgs production a structure function 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 play. A particular challenge for calculations at this order is the evaluation of two-loop diagrams with several...
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Federico Gasparotto (JGU Mainz)29/05/2023, 16:00
We will discuss how methods developed in the context of perturbation theory can be applied to the computation of lattice correlation functions, in particular in the 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 correlation...
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Bakul Agarwal (Karlsruhe Institute of Technology (ITP))29/05/2023, 16:30
Pair production of Z bosons is an essential process at the LHC. It is a significant background to Higgs production, and subsequent decay through the four lepton channel, as well as an important signal process for new physics searches. In this talk, we present our calculation of the next-to-leading order QCD corrections to Z-pair production through gluon fusion with full top quark mass...
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David Broadhurst (Open University, UK)29/05/2023, 16:30
The generic 3-loop tetrahedral tadpole, with 6 distinct masses, has elliptic subtructure originating from 12 distinct elliptic curves. I shall show how to evaluate it, at high precision and great speed, by integrating dilogarithms against complete integrals of the third kind, for which there is a proceudre of the arithmetic-geometric mean that is astoundingly fast. The elements of this method...
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Henrik Jessen Munch (University of Padova)29/05/2023, 17:00
We propose a Monte Carlo integration algorithm for numerically evaluating Feynman integrals in the physical region of phase space. The algorithm is an extension of the tropical integration algorithm of M. Borinsky. Starting from the projective representation of a Feynman integral, we implement Feynman's i*epsilon prescription via a suitable contour deformation, whereafter tropical sampling is...
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Luca Buonocore (University of Zurich)29/05/2023, 17:00
We 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 ambiguities associated with the correct flavour assignment in massless calculations, paving the way to a more realistic comparison with experimental data. The relevant...
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Hjalte Frellesvig (NBIA, Copenhagen)29/05/2023, 18:00
I will discuss 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 with current techniques are a significant bottleneck for phenomenologically relevant scattering amplitude computations.
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Melih Arslan Ozcelik (IJCLab - CNRS/Université Paris-Saclay)29/05/2023, 18:00
We compute the two-loop master integrals relevant for the NNLO QCD correction to heavy pseudo-scalar quarkonium production and decay both analytically and numerically. The analytic expressions involve elliptic multiple polylogarithms and iterated integrals of modular forms. We discuss the master integral computation and the form-factors obtained. We briefly discuss their phenomenological importance.
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Narayan Rana (NISER Bhubaneswar)29/05/2023, 18:30
In this talk, we present the mixed QCD-EW two-loop virtual corrections for the charged current 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 approach to evaluate the relevant two-loop Feynman integrals using semi-analytical...
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Xiao Liu (University of Oxford)29/05/2023, 18:30
In this talk, I will introduce new tools towards the evaluation of Feynman integrals, including AMFlow and Blade. AMFlow, based on auxiliary mass flow method, which can numerically evaluate Feynman integrals in an efficient and systematic way, have proved to be very useful in the past year. Another tool named Blade, which is based on block-triangular relations among Feynman integrals, can...
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Chiara Savoini (University of Zurich)29/05/2023, 19:00
The associated production of a Higgs boson with a top–antitop quark pair is a crucial process at the LHC since it allows for a direct measurement of the top-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 order (NNLO) in QCD perturbation theory. This represents the very first computation for a 2 → 3...
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Pavel Novichkov (IPhT CEA/Saclay)29/05/2023, 19:00
In multiloop computations, choosing an integral basis that minimizes infrared divergences holds the promise of simplifying results. I describe a procedure based on analysis of Landau equations for finding sets of finite integrals. The same technique can also be applied to finding integrals which are manifestly O(ϵ). These integrals can give rise to special relations between integrals beyond...
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Alexandre Salas-Bernárdez (Universidad Complutense de Madrid)30/05/2023, 08:30
I will present flow oriented perturbation theory (FOPT), a coordinate space analogue of time-ordered perturbation theory and loop-tree duality. Within this approach, a generic Feynman graph is mapped to a sum of all its possible different energy-flows respecting energy conservation at each vertex (strongly connected directed graphs). In the FOPT framework, the integrals associated with virtual...
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Andreas van Hameren30/05/2023, 08:30
The hybrid kT-factorization formula, for which one initial-state parton momentum is space-like and carries non-vanishing transverse components while the other is on-shell, is promoted to NLO for arbitrary processes. We identify all soft and collinear divergencies in the partonic cross section, and recognize that the non-cancelling ones can be attributed to PDF evolution, evolution kernel, and...
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Arnd Behring (CERN)30/05/2023, 09:00
The rho parameter is an important Standard Model precision observable. It is currently known to four-loop order in QCD in the limit of vanishing bottom quark mass. When the rho 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...
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Zeno Capatti (ETH Zürich)30/05/2023, 09:00
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Ben Page (CERN)30/05/2023, 09:30
Evanescent integrals are those whose integrands vanish when considered on loop momentum configurations that are strictly four-dimensional. They naturally span the space of dimensionally-regulated integrals that are missed when performing four-dimensional unitarity cuts. Such integrals are well understood at one loop, where they give rise to the so-called "rational part" of the amplitude. In...
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Nikolaos Syrrakos (TUM)30/05/2023, 09:30
I 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 production at the LHC. I will describe the analytic structure of these integrals as well as several technical issues regarding their analytic computation using canonical differential equations. Finally I will comment on the...
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Dmitry Chicherin (LAPTh, CNRS)30/05/2023, 10:00
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Kay Schönwald (University of Zurich)30/05/2023, 10:00
Massive form 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 interesting to study also in the context of the infrared structure of QCD amplitudes. In this...
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Giulio Gambuti (University of Oxford)30/05/2023, 11:00
I will discuss the two-loop computation of massless QCD helicity amplitudes with five external states and full colour dependence.
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Johannes Bluemlein (DESY)30/05/2023, 11:00
We present recent analytic results on the 3-loop heavy flavor corrections to deep-inelastic scattering.
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Rene Poncelet (Cambridge University Cavendish Laboratory)30/05/2023, 11:30
Multi-jet rates at hadron colliders provide a unique possibility for probing Quantum Chromodynamics (QCD), the theory of strong interactions. By comparing theory predictions with collider data, one can directly test perturbative QCD, extract fundamental parameters like the strong coupling and search for physics beyond the Standard Model. Recent developments enabled lifting three-jet...
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Sven-Olaf Moch (University of Hamburg)30/05/2023, 11:30
We present recent results on the computation of the splitting functions in quantum chromodynamics at four loops.
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Simone Zoia (University of Turin)30/05/2023, 12:00
I discuss the recent advances in the computation of two-loop scattering amplitudes for five-particle processes. The latter are fundamental ingredients to obtain predictions at the next-to-next-to-leading order (NNLO) in QCD for many interesting LHC processes. I discuss the state-of-the-art technology for computing scattering amplitudes analytically, and present new results relevant for the LHC...
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Zhewei Yin (Uppsala University)30/05/2023, 12:00
The most general renormalizable quantum field theory one can write down for a finite spectrum of spin-0, 1/2, and 1 particles is a gauge theory, with possible spontaneously broken symmetries. The existence of Lie group structures in such a theory is determined by perturbative unitarity of the on-shell scattering amplitudes. Armed with new tools developed for scattering amplitudes, we...
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Mathieu Giroux (McGill University)30/05/2023, 14:00
Multi-loop Feynman integrals are the cornerstone of modern perturbative approaches to quantum field theory and a pillar of precision computations for colliders as well as gravitational wave experiments. It is therefore essential to develop 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...
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Zelong Liu (CERN)30/05/2023, 14:00
The knowledge of infrared singularities of gauge-theory amplitudes enables us to systematically resum large logarithmic corrections to many important observables. In this talk, I will present the structure of anomalous dimensions governing infrared singularities of QCD amplitudes with one massive and an arbitrary number of massless external partons. The analytical expression of tripole...
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Leonardo Vernazza (INFN, Torino)30/05/2023, 14:30
I will discuss recent progress concerning the factorization of physical observables and the resummation of large logarithms at next-to-leading power, focusing on the loop calculation of the universal functions in which physical observables factorize.
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Yu Jiao Zhu (Bonn University)30/05/2023, 14:30
Amplitude are geometric objects and we have ambitions to classify them. As functions of discrete indices of color, charge, helicity, ..., and spin, they are tensors on the Fock spaces of elementary particles. Linear spaces, like the Fock spaces, they have automorphisms under which a given tensor is transformed into another in the equivalent class. In this sense, equivalent classes of tensors...
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Kai Yan (Shanghai Jiao Tong University)30/05/2023, 15:00
The Energy Correlator observables probe the geometric distributions of energy flow in the final states of particle scattering experiments. They provide valuable data for studies ranging from conformal field theories to jet substructure. We present an analytic formula for the three-point energy correlator (EEEC) at leading order (LO) in N = 4 super Yang Mills theory, which exhibits unexplored...
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Matteo Becchetti (University of Turin)30/05/2023, 15:00
We report on recent progress for the QCD corrections to top-quark pair plus jet production. In particular, we discuss a recent computation for the two-loop master integrals associated to a two-loop five-point pentagon-box integral configuration with one internal massive propagator, that contributes to top-quark pair production in association with a jet in the QCD planar limit.
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Daniel Stremmer (RWTH Aachen University)30/05/2023, 16:00
In 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 used to model the decays of the top quark pair preserving spin correlations. Jet radiation and QCD corrections are consistently included in the production and decay of the top quarks. We discuss the size of NLO QCD corrections and the main...
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Gherardo Vita (CERN)30/05/2023, 16:00
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Giovanni Pelliccioli (Max-Planck-Institut für Physik)30/05/2023, 16:30
The associated production of a single top quark with a Z boson (tZj) represents an important probe of the EW sector of the Standard Model. Since differential measurements of tZj are expected to enhance the sensitivity to new-physics effects, and the experimental interest in this direction is growing in the light of upcoming LHC runs, it is crucial to improve the off-shell modelling of this...
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Mr Piotr Bargiela (University of Oxford)30/05/2023, 16:30
Scattering amplitudes are the fundamental building blocks of collider observables. Comparing high precision measurements with theory predictions requires computing them to high perturbative order. The growth in the number of loops significantly increases the complexity of the problem. Using novel methods allowed us to compute QCD corrections to four-point massless processes at the...
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Paolo Torrielli (Università di Torino and INFN)30/05/2023, 17:00
I discuss a new observable for the determination of the W mass at hadron colliders
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Yao Ma (University of Edinburgh)30/05/2023, 17:00
The method of regions (MoR), a systematic way to compute Feynman integrals involving multiple kinematic scales, states that a Feynman integral can be approximated, and even reproduced, by summing over integrals that are expanded in certain regions. A modern perspective of the MoR is to consider any given Feynman integral as a certain Newton polytope, which is defined as the convex hull of the...
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Federica Devoto (University of Oxford)30/05/2023, 18:00
In this talk, 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.
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We find that the mixed corrections corrections are larger than what one would expect based on the magnitude of the coupling... -
Giuseppe Bevilacqua (NCSR Demokritos)30/05/2023, 18:00
As one of the primary sources of QCD background to $pp \to t\bar{t}H(H\to b\bar{b})$ at the LHC, the $t\bar{t}b\bar{b}$ production process demands precise theoretical predictions and estimates of the dominant uncertainties. On top of that, the capacity of properly disentangling the prompt b-jets and the b-jets from top-quark decays has important phenomenological consequences. In this talk we...
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Rhorry Gauld (MPP Münich)30/05/2023, 18:30
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Tongzhi Yang (University of Zurich)30/05/2023, 18:30
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Andrea Pelloni (Nikhef)30/05/2023, 19:00
We have calculated the $n_f^2$ and $n_f^3$ contributions to the flavour non-singlet structure functions $F_2$ and $F_L$ and most recently $F_3$ in inclusive deep-inelastic scattering at the fourth order in the strong coupling $\alpha_s$. The coefficient functions have been obtained by computing a very large number of Mellin-N moments using the method of differential equations, and then...
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Manuel Egner (KIT)30/05/2023, 19:00
The decay of B mesons can be described 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 and nonleptonic decays of a free bottom quark including a non-vanishing charm quark mass. For the semileptonic decays we obtain an analytic...
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Lorenzo Magnea (University of Torino)31/05/2023, 08:30
Following up on some distant and little-known papers by Tullio Regge and collaborators, I will present an approach to integration-by-parts identities and differential equations for Feynman integrals, based on the Feynman parameter representation, and relying upon the projective nature of parameter integrands. A very general identity connecting projective forms allows to move across families of...
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Sebastian Mizera (Perimeter Institute for Theoretical Physics)31/05/2023, 09:00
Landau analysis aims to predict the singularity structure of Feynman integrals without their explicit evaluation. We point out a number of errors in its textbook formulation that prevented applications to the Standard Model processes in the past. After resolving these issues, we use a combination of tropical analysis and numerical algebraic geometry to implement an algorithm that classifies...
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Thomas Gehrmann (University of Zurich)31/05/2023, 09:30
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HuaXing Zhu (Zhejiang University)31/05/2023, 10:00
Dynamics of high energy scattering in QCD are primarily probed through detector energy flow correlations. One important IRC safe energy-flow observable is the Energy-Energy Correlator (EEC). At leading power approximation in the back-to-back limit, EEC enjoys a factorization formula similar to the Drell-Yan production at small transverse momentum. Therefor studying the power corrections to EEC...
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Martin Beneke (Technische Universität München)31/05/2023, 11:00
We subtract the gluon-condensate renormalon singularity in the Adler function, which causes the discrepancy between fixed-order (FOPT) and contour-improved perturbation theory (CIPT), employing the gradient flow action density. The scheme leads to automatic subtraction, does not require knowledge of the Stokes constant (renormalon residue), and relates to a non-perturbatively defined cut-off...
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Robert Szafron (Brookhaven National Laboratory)31/05/2023, 11:30
In my talk, I will present the calculation of the two-loop soft and beam functions for the transverse-momentum distribution of the leading jet in the production of a colour-singlet system such as a Higgs or Z boson. This calculation constitutes a vital component for the resummation of the transverse-momentum distribution and the jet-vetoed cross-section at next-to-next-to-next-to-leading...
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Michał Czakon (RWTH Aachen University)31/05/2023, 12:00
I will present recently published as well as yet unpublished results on multi-photon and multi-jet cross sections obtained with next-to-next-to-leading and possibly higher order in perturbative QCD.
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31/05/2023, 14:00
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66. Andre Hoang - Calibration of the MC top quark mass parameter with variable parton shower cut-offAndre Hoang (University of Vienna)01/06/2023, 08:30
In a recent work by Hoang, Plätzer and Samitz is has been shown at the parton level that the relation top quark mass in MC event generators to a well-defined renormalization scheme depends on the parton shower cutoff. Still, it has not been known to which extent the hadronization model may affect this relation and how much this relation depends on the MC event generator and the NLO matching...
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Dhimiter Canko (NSCR "Demokritos")01/06/2023, 08:30
We present an extension of HELAC for two-loop amplitudes. All basic two-loop topologies (Theta, Infinity, Dumbbell) are included in the skeleton construction. For 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...
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Ludovic Scyboz (University of Oxford)01/06/2023, 09:00
In this talk I investigate the interplay of NLO matching and next-to-leading-logarithmic (NLL) parton showers in the context of two-body decays. Three matching schemes have been implemented in the NLL-accurate PanScales showers: a multiplicative scheme, MC@NLO and POWHEG. By means of both analytic and numerical arguments, I show how these retain the shower’s NLL accuracy, and (under certain...
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Pia Bredt (University of Siegen)01/06/2023, 09:00
In this talk I will 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 sections and differential distributions. The generalization of the implemented FKS scheme to systematically subtract QED and QCD infrared divergences in mixed...
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Aparna Sankar (Technical University of Munich, Department of Physics)01/06/2023, 09:30
In this talk, I will discuss a framework that resums soft (logarithms ln^k(N) in Mellin space) and next-to-soft (power-suppressed terms ln^k(N)/N in Mellin space) logarithms to all orders in perturbative QCD. We use the concepts of collinear factorisation and renormalisation group invariance to achieve this. The former allows one to define a soft-collinear (SC) function that encapsulates soft...
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Peter Skands (Monash University)01/06/2023, 09:30
I will describe recent progress on sector showers that consistently incorporate second-order "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 natural and fully differential way to calculations at this accuracy, provided that consistent "Born-local" K-factors can be defined. The method appears...
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Jonathan Gaunt (University of Manchester)01/06/2023, 10:00
Double parton scattering (DPS) is the process in which one has two hard scatterings in an individual proton-proton collision. It can compete in rate with single scattering in certain kinematic regions and/or for certain processes, and reveals information on nucleon structure not accessible in single parton scattering: spatial, spin, and colour correlations between the partons inside the...
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Silvia Zanoli (Max-Planck-Institut für Physik)01/06/2023, 10:00
In view of the increasing level of precision of current and future experimental measurements, matching NNLO QCD and NLO EW corrections represents a crucial step for LHC phenomenology. Furthermore, complementing fixed-order perturbative computations with parton-shower effects is indispensable for a realistic description of LHC processes. In this talk we present the computation of WZ production...
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Chen-Yu Wang (MPP)01/06/2023, 11:00
The advancement of computation techniques enables a number of N3LO calculations in perturbative QCD, which are crucial to reaching percent level accuracy in the LHC (and the upcoming HL-LHC) phenomenology. An important part of this effort involves properly extracting IR singularities at N3LO. The N-jettiness slicing scheme is one of the techniques to deal with this problem, but is only...
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Michael Fucilla (Università della calabria)01/06/2023, 11:00
Precision physics in the Higgs sector has been one of the main challenges in recent years. The pure fixed-order calculations entering in the \textit{collinear factorization} framework, which have been pushed up to N3LO, are not able to describe the entire kinematic spectrum. In particular conditions, they must be necessarily supplemented by all-order \textit{resummations}; for instance, in the...
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Frank Petriello (Northwestern University and Argonne National Laboratory)01/06/2023, 11:30
We discuss new observables for probing physics beyond the SM within the framework of the Standard Model Effective Field Theory (SMEFT). We consider both existing measurements at the LHC, and potential future ones at upcoming colliders such as the Electron-Ion Collider (EIC).
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Philipp Böer (University of Mainz)01/06/2023, 11:30
Using diagrammatic resummation techniques, I discuss the double logarithmic series of B_c to eta_c form factors at large hadronic recoil. In the non-relativistic limit, mb >> mc >> LambdaQCD, this process provides one of the simplest setups to study the problem of endpoint singularities appearing in the SCET factorization of exclusive B decay amplitudes in a perturbative framework. The leading...
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Herschel Chawdhry (University of Oxford)01/06/2023, 12:00
Quantum computers offer major speed-ups for problems like prime factorisation, searching, 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 remained unexplored. As a first non-trivial step, I will discuss the quantum simulation of colour...
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Leonardo Di Giustino (Insubria and INFN)01/06/2023, 12:00
The renormalization scale setting in QCD is a fundamental problem for high precision tests of the Standard Model (SM). It is considered a conventional practice to set the renormalization scale to the typical scale of a process Q, namely to the momentum transfer and to determine theoretical errors by varying it in a range of two. According to the Conventional Scale Setting (C.S.S.),...
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Calum Milloy (University of Turin)01/06/2023, 14:00
Scattering amplitudes greatly simplify in the Regge limit, and yet exhibit a very interesting structure, which is far richer in the full gauge theory than in the planar limit. Prior to the development of QCD, Regge and others showed that the asymptotic high-energy behaviour of amplitudes is governed by poles and cuts in the complex angular momentum plane. It was also shown (Mandelstam, 1963)...
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Vitalii Maheria (ITP KIT)01/06/2023, 14:00
I'd like to present the new developments and talk about the current status of numerical evaluation of multi-loop integrals and amplitudes using the new release of pySecDec (v1.6), particularly concentrating on significant integration performance improvements and automation related to expansion-by-regions.
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Gloria Bertolotti (University of Turin)01/06/2023, 14:30
This talk presents the construction of the NNLO subtraction formula for the cancellation of IR singularities obtained within the framework of Local Analytic Sector Subtraction. Such general program has been (so far) completed for the treatment of unresolved radiation in processes featuring any partonic final state in massless QCD. The outcome of the subtraction is a compact and analytic...
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Jeppe Andersen (IPPP, Univ. of Durham)01/06/2023, 14:30
We present high energy next-to-leading logarithmic corrections, their inclusion within the framework of High Energy Jets, and their impact on the stabilisation of the perturbative prediction of R32 for large rapidity separations.
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Andreas Maier (DESY)01/06/2023, 15:00
At high energies, fixed-order predictions for the production of a Higgs boson together with one or more jets suffer from large logarithms in invariant masses over transverse momenta. We resum these high-energy logarithms to all orders within the High Energy Jets (HEJ) framework, retaining the exact dependence on the top-quark mass. We compare our predictions to ATLAS and CMS measurements at 8...
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Matteo Marcoli (University of Zurich)01/06/2023, 15:00
In the past decade the antenna subtraction method has been successfully implemented to compute Next-to-Next-to-Leading Order (NNLO) corrections in QCD for a series of relevant processes. In this talk we discuss the first steps towards the extension of this method at Next-to-Next-to-Next-to-Leading Order (N3LO). In particular, the calculation of N3LO antenna functions for final state radiation...
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Chiara Signorile-Signorile (Karlsruhe Institute of Technology)01/06/2023, 16:00
In this talk, I will present recent progress in the generalisation of the nested soft-collinear subtraction scheme to multi-parton final state processes. The scheme has already been successfully applied to scatterings involving a limited number of coloured partons, and it has shown remarkable flexibility and good numerical performances. I will discuss how to overcome the difficulties that...
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Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN-TIFPA)01/06/2023, 16:00
Recent analyses on high-energy inclusive Higgs-boson rates in proton collisions via the gluon fusion channel, matched with the state of-the-art fixed-order N3LO accuracy, have shown that the impact of high-energy 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...
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Sebastian Jaskiewicz (Durham University IPPP)01/06/2023, 16:30
In this talk I will present the method to merge the resummation of high energy logarithms implemented in High Energy Jets (HEJ) partonic Monte Carlo framework with the soft-collinear effects described by the Pythia parton shower. The method preserves the accuracy of the leading order cross sections and the logarithmic accuracy of both resummation schemes across all of phase space. I will show...
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Yannick Ulrich (University of Durham)01/06/2023, 16:30
Low-energy experiments allow for some of the most precise measurements in particle physics, such as g-2. To make the most of these experiments, theory needs to match the experimental precision. Over the last decade, this meant that even in QED next-to-next-to-leading order calculations (or even more in some cases) became necessary. I will discuss some of the challenges faced when dealing with...
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Marco Rocco (Paul Scherrer Institut)01/06/2023, 17:00
A recently proposed experiment, MUonE, aims to extract the hadronic vacuum polarisation contribution to the muon g-2 from muon-electron scattering at low energy. The extrapolation requires that both experimental and theoretical uncertainties do not exceed 10 ppm. This corresponds, at least, to next-to-next-to leading order QED corrections to $e\mu \to e\mu$. I will discuss the implementation...
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Melissa van Beekveld (University of Oxford)01/06/2023, 17:00
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Andrzej Czarnecki (University of Alberta)01/06/2023, 18:00
This talk will present radiative corrections and their interpretation for the so-called D-term. This is related to the Electron-Ion Collider project, where 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...
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Oscar Braun-White (IPPP Durham University)01/06/2023, 18:00
The antenna subtraction method has been successfully applied to a wide range of processes relevant for the Large Hadron Collider at next-to-next-to-leading order in $\alpha_s$ (NNLO). We propose an algorithm for building antenna functions for any number of real emissions directly out of the unresolved limits we require. Antenna functions of this kind always identify two hard radiators. We then...
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Boris Kopeliovich (UTFSM, Valparaiso)01/06/2023, 18:30
The anomalous excess of soft photons radiated in inelastic hadronic collisions, has been challenging the physics community over four decades, but no solution was proposed so far. We argue that the problem is rooted in comparison with an incorrect model for radiative corrections, usually called bremsstrahlung model. It is based on an illegitimate extension of the Low theorem to radiative...
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Fernando Febres Cordero (Florida State University)01/06/2023, 18:30
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Bennie Ward (Baylor University)01/06/2023, 19:00
There is a continuing 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 resummation in quantum field theory relevant to such support and preparation with some emphasis on the interplay between soft and collinear resummation algebras.
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Michael Ruf (UCLA)01/06/2023, 19:00
The gravitation binary problem and the associated production of gravitational waves can be treated efficiently within the framework of quantum field theory. This allows to make use of a variety of tools ranging from double copy relations between gauge theory and gravity to methods from effective field theory and multi-loop integration. I will show recent progress in applying this approach to...
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Johannes Henn (Max Planck Institute for Physics, Munich)02/06/2023, 08:30
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Peter Marquard (DESY)02/06/2023, 09:00
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Matthias Steinhauser (KIT)02/06/2023, 09:30
We consider two-loop corrections 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 that the whole phase space can be covered and time-consuming numerical...
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Ekta Chaubey (ekta@lpthe.jussieu.fr)02/06/2023, 10:00
In this talk we present the analytic results for two-loop QCD as well as QED corrections to light-by-light scattering including contributions due to massive internal fermions.
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David A Kosower (IPhT, CEA-Saclay)02/06/2023, 11:00
One-loop integrands 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-fraction integrands in a systematic way. This provides the first step towards a decomposition...
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Silvia Ferrario Ravasio (CERN)02/06/2023, 11:30
Shower Monte Carlo generators simulate fully realistic collider events, and reproduce much of the data from the LHC and its predecessors. Their core is represented by Parton Shower~(PS) algorithms, which provide the inclusion of soft radiation and enable us to mimic a realistic high-multiplicity collider event. The flexibility of these tools comes at a cost of a lower accuracy, which can lead...
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Keith Ellis (IPPP, Durham)02/06/2023, 12:00
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