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Prof. Thomas Di Piero, Prof. Pavel Nadolsky (Southern Methodist University)20/05/2024, 08:45
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Matthew Henry Klein (Southern Methodist University (US))20/05/2024, 09:00
Since the discovery of the Higgs boson in 2012, the ATLAS and CMS collaborations at the LHC have made precise measurements of a variety of Higgs boson properties, without significant evidence of any BSM behavior. However, large uncertainties are still present on many properties, and many others still remain unmeasured. In this talk, I will summarize the status of Higgs boson measurements and...
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Ciaran Williams (SUNY Buffalo)20/05/2024, 09:35
We present a calculation of pseudoscalar Higgs production in association with a jet at Next-to-Next-to Leading Order (NNLO) accuracy in QCD. We work in an effective field theory in which $m_t \rightarrow \infty$ resulting in effective operators which couple the pseudoscalar to gluons and (massless) quarks. We have calculated all of the relevant amplitudes for the two-loop, one-loop and...
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Felix Eschment (Institut für Theoretische Teilchenphysik und Kosmologie, RWTH Aachen University)20/05/2024, 10:10
The impact of finite bottom-quark mass effects at next-to-next-to-leading order constitutes one of the leading theory uncertainties of the Higgs production cross section.
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In this talk, I will present our evaluation of this contribution. We computed the relevant two-loop master integrals that enter the real-virtual contribution numerically using the method of differential equations. In... -
Aparna Sankar20/05/2024, 11:15
With the growing precision of experimental measurements, combining fixed-order perturbative calculations with parton-shower effects becomes essential for an accurate description of LHC phenomenology. In this talk, we focus on the computation of Higgs production via bottom-quark annihilation ($b \bar{b}H$) at next-to-next-to-leading order (NNLO) in QCD perturbation theory, consistently matched...
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Manfred Kraus (UNAM)20/05/2024, 11:50
I will present our recent computation of the first set of two-loop master integrals for the top-quark pair production in association with a Higgs boson. Exploiting numerical evaluations in modular arithmetic, we construct a basis of master integrals satisfying a system of differential equations in $\epsilon$-factorized form. We discuss the analytical structure of the differential equations and...
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Harald Ita (PSI)20/05/2024, 14:00
We compute the two-loop helicity amplitudes for the scattering of five partons, including all contributions beyond the leading-color approximation. The analytic expressions are represented as linear combinations of transcendental functions with rational coefficients, which we reconstruct from finite-field samples obtained with the numerical unitarity method. Guided by the requirement of...
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Antonela Matijašić20/05/2024, 14:35
The state-of-the-art in current two-loop QCD amplitude calculations is at five-particle scattering. In contrast, very little is known at present about two–loop six–particle scattering processes. In recent years, the results for one-loop hexagon integrals to higher order in the dimensional regulator become available as well as the results on the maximal cut of the planar two-loop six-point...
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Herschel Chawdhry (Florida State University)20/05/2024, 15:10
The calculation and manipulation of large multi-variable rational
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functions is a key bottleneck in multi-loop calculations. In this talk I
will present work using p-adic numbers to reconstruct rational functions
in a compact form. I will apply this to examples such as rational
functions appearing in cutting-edge 2-loop 5-point amplitudes calculations. -
Xin Guan (SLAC)20/05/2024, 16:15
Feynman integral reduction is very challenging for state-of-the-art calculations. Blade represents the first implementation of the block-triangular form improved Feynman integral reduction method, typically resulting in a remarkable improvement of the IBP reduction efficiency by one to two orders of magnitude. In this talk, I will introduce the key ideas of Blade and present various benchmarks.
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Ayres Freitas20/05/2024, 16:50
This talk describes a modular framework for the description of electroweak scattering and decay processes, including but not limited to Z-resonance physics. The framework consistently combines a complex-pole expansion near a s-channel resonance with a regular fixed-order perturbative description away from the resonance, in a manifestly gauge-invariant scheme. This framework has been...
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Adam Kardos20/05/2024, 17:25
NNLO QCD corrections are indispensible for Today's and
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tomorrow's colliders. Several schemes are available in
the literature. The LASS (Local Analytic Subtraction Scheme)
as it is developed in Turin gives one more solution to
the problem. Its simple analytical integrals make it tempting
to generalize even to hadron collisions. Before this
crucial step a proof-of-concept numerical... -
Prof. Fred Olness (Southern Methodist University (US))20/05/2024, 18:00
We review improvements in precision heavy quark production including updates in the xFitter global analysis framework, and extensions of ACOT using fast grid techniques.
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Thomas Cridge (DESY)21/05/2024, 09:00
We will review the extension of the MSHT20 PDFs to approximate N3LO order and the consequences for phenomenology. We first describe the inclusion of the known N3LO information and the parameterisation of the remaining missing N3LO contributions, as well as the determination of the theoretical uncertainties from missing pieces and higher orders and their interpretation. We then examine the...
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Marco Guzzi (Kennesaw State University)21/05/2024, 09:35
I report on the progress in the precision studies of hadronic parton distributions by the CTEQ-TEA (Tung Et Al.) group.
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Tobias Neumann (William & Mary)21/05/2024, 10:10
Parton distribution functions (PDFs) are of key interest in both particle and nuclear physics. At the LHC, the limited knowledge of PDFs is currently one of the leading bottlenecks in precise predictions. In nuclear physics, PDFs provide insight into the structure of the nucleon, towards more complicated systems.
In this talk I will first motivate the need for precise PDFs, then explain how...
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Rudi Rahn (University of Vienna)21/05/2024, 11:15
In this talk I'll present our recent work calculating the N-jettiness soft function, based on an extension of the SoftSERVE framework to the general case of N+2 jets and beams for a priori general global observables. I will comment on our approach, present an explicit grid scanning the 2-jettiness soft function, and shed some light on the behaviour of the N-jettiness soft function at the...
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Xiaoyuan Zhang21/05/2024, 11:50
Measuring the strong coupling constant from high-energy collider data with precision comparable to the lattice has been a persistent challenge. For e+e- event shapes, a long-standing discrepancy between extractions from thrust and heavy jet mass may be due to physics in the trijet region. In particular, there is Sudakov shoulder in heavy-jet mass but not thrust which we now know how to resum...
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Ted Rogers (Old Dominion University)21/05/2024, 12:25
I will discuss issues that arise from the mismatch between asymptotic states and partonic states in the formal definitions of fragmentation functions. I will show that standard derivations of common sum rules need to be modified for gauge theories, and discuss several possibilities for constructing more precise definitions. Implications for phenomenological applications will also be discussed.
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Nikolaos Kidonakis21/05/2024, 14:30
I present results for the cusp anomalous dimension in QCD at higher orders. I discuss a general method for determining the massive cusp anomalous dimension to a very high degree of accuracy using its asymptotic behavior at small and large quark velocities, and I present explicit calculations through four loops. Separate results for different values of the number of flavors and for distinct...
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Marius Wiesemann (Max Planck Institute for Physics), Marius Wiesemann (Max Planck Institute for Physics Munich)21/05/2024, 15:05
The MiNNLO framework offers an efficient approach to consistently include NNLO QCD corrections within Monte-Carlo event generators. As the first (and only) NNLO+PS method that was extended beyond colour-singlet production, recent developments of the MiNNLO method will be discussed that tackle new classes of hadron-collider reactions, including heavy quarks, jets, and colour singlets in the...
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Keping Xie (Michigan State University)21/05/2024, 15:40
The general mass variable flavor number (GMVFN) scheme S-ACOT-MPS will
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be discussed for proton-proton collisions. The impact of heavy-flavor
contributions within this factorization scheme will be shown for the production
of a $Z$ boson in association with a charm/bottom quark in pQCD.
An amended version of the QCD factorization formula for proton-proton collisions will
be discussed as... -
Laura Reina (Florida State University (US))21/05/2024, 16:45
We present results from a global fit of dimension-six SMEFT operators that includes electroweak, Higgs-boson, top-quark, and flavor observables. The leading-order scale dependence of the SMEFT Wilson
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coefficients is consistently included in the evolution from the UV
scale to the electroweak scale and the low-energy scale of flavor
observables. The global fit is obtained within the HEPfit... -
Radja Boughezal21/05/2024, 17:20
This talk will consider the potential of LHC Drell-Yan measurements to probe several aspects of the SMEFT. We consider the full spectrum of data, including the invariant mass, forward-backward asymmetry,transverse momentum and lepton angular distributions. We demonstrate the importance of higher-order dimension-8 terms in the SMEFT expansion. We also discuss operators that lead to...
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Tao Han21/05/2024, 17:55
The Standard Model electroweak sector exhibits some novel features at very high energies. For E >> v (the Higgs vev), the EW gauge symmetry is essentially restored and the massless splitting phenomena dominate the EW physics. Beyond the familiar gauge theory splitting functions, we discuss the emergence of additional ``ultra-collinear'' splitting phenomena and the violation of the...
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Prof. Johannes Bluemlein21/05/2024, 18:30
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Darin Acosta (Rice University (US))22/05/2024, 09:00
A TeV muon-ion collider could be established if a high energy muon beam that is appropriately cooled and accelerated to the TeV scale is brought into collision with a high energy hadron beam using facilities such as at Brookhaven National Lab, Fermilab, or CERN. Such a collider opens up a new regime for deep inelastic scattering studies as well as facilitates precision QCD and electroweak...
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Allison Mccarn Deiana (Southern Methodist University (US))22/05/2024, 09:35
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Darin Acosta (Rice University), Allison Mccarn Deiana (Southern Methodist University (US)), Joey Huston (Michigan State University (US))22/05/2024, 10:10
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Silvia Ferrario Ravasio (CERN)22/05/2024, 11:15
Parton shower event generators are essential tools for establishing the quantitative connection between theory and experiment. However, their flexibility comes with a trade-off: they generally offer lower formal accuracy compared to state-of-the-art analytic calculations, which in turn have more limited applicability. The poor accuracy of the inevitably employed parton shower generators...
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Matthew Lim (University of Sussex)22/05/2024, 11:50
The GENEVA method provides a means to combine resummed and fixed order calculations at state-of-the-art accuracy with a parton shower program. GENEVA NNLO+PS generators have now been constructed for a range of colour-singlet production processes and using a range of different resolution variables. I will review the GENEVA framework and then describe several recent advancements, such as the use...
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Joshua Isaacson22/05/2024, 12:25
This talk presents a novel GPU-accelerated framework for efficient tree and one-loop matrix element evaluation. By leveraging the massively parallel architecture of GPUs and the performance-portable Kokkos library, we achieve significant speedups for both tree-level and one-loop calculations. Additionally, we introduce a cutting-edge library for evaluating multiple polylogarithms on the GPU.
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Yao Ma (ETH Zurich)22/05/2024, 14:00
The method of regions, a systematic approach to the asymptotic expansions of Feynman integrals, suggests that a Feynman integral can be reconstructed by summing over integrals expanded in certain regions. This technique not only facilitates the computation of Feynman integrals but also provides valuable insights for formulating an EFT, such as the Soft-Collinear Effective Theory (SCET)....
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Rui Zhang22/05/2024, 14:35
The generalized parton distributions (GPDs) provide important information for 3D imaging of the proton in the longitudinal momentum fraction $x$ and transverse impact parameter space. Recently, thanks to large-momentum effective theory, they can be directly calculated in lattice QCD from the so-called quasi-GPDs. In the perturbative matching of quasi-GPDs to GPDs, there are logarithms related...
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Radu Roiban22/05/2024, 15:10
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Prof. Pavel Nadolsky (Southern Methodist University)22/05/2024, 16:00
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