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Ubirajara van Kolck (ECT*, Trento)6/15/26, 9:20 AM
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Martha Constantinou6/15/26, 9:35 AM
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Charlotte Van Hulse (VUB)6/15/26, 9:40 AM
An update of the existing experimental measurements sensitive to GPDs will be presented and the plans for future measurements accessing GPDs will be discussed. Here, the complementarity between different physics channels and collision systems will be highlighted.
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Mostafa Hoballah (IJCLab CNRS-IN2P3)6/15/26, 10:10 AM
A key step toward a better understanding of the nucleon structure is the study of Generalized Parton Distributions (GPDs). GPDs are nowadays the object of an intense effort of research since they convey an image of the nucleon structure where the longitudinal momentum and the transverse position of the partons inside the nucleon are correlated. Moreover, GPDs give access, via Ji's sum rule, to...
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Vladimir Braun (Regensburg University)6/15/26, 11:15 AM
We develop a new technique and calculate conformal (Gegenbauer) moments of the two-loop coefficient functions in Deeply Virtual Compton Scattering (DVCS). This formulation is necessary for the extraction of the generalized parton distributions from the experimental data to the NNLO accuracy within the Mellin-Barnes approach.
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Nobuo Sato (Jefferson Lab)6/15/26, 11:45 AM
Precision studies of hadron structure increasingly require the integration of heterogeneous information from experiments, theoretical calculations, and numerical simulations. This talk will present recent developments in AI-assisted inference frameworks for hadron structure studies, including applications of machine learning, simulation-based inference, and generative modeling to global QCD...
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Marc Vanderhaeghen (University Mainz)6/15/26, 12:15 PM
In this talk, I will discuss the deeply-virtual Compton scattering process involving the transition between a nucleon and a nucleon resonance in the pion-nucleon system, within the framework of GPDs. For the four lowest-lying nucleon resonances, Delta(1232), N(1440), N(1520), and N(1535),
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the DVCS amplitude in the Bjorken limit has been expressed in terms of corresponding... -
Yuxun Guo (Lawrence Berkeley National Laboratory/Brookhaven National Lab)6/15/26, 2:15 PM
Understanding the mass, spin, and mechanical structure of the nucleon is a central goal of nuclear physics and a key motivation for Jefferson Lab, the future EIC at BNL. In this talk, I will present recent progress in extracting generalized parton distributions and gravitational form factors from exclusive processes, with a focus on a state-of-the-art global analysis combining experimental and...
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Eric Moffat (Argonne National Lab)6/15/26, 2:45 PM
I will present results of a Bayesian Monte Carlo extraction of Generalized Parton Distributions from available Deeply Virtual Compton Scattering data.
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Huayu Jiang (Henan Normal University)6/16/26, 9:30 AM
We calculate the ``kinematic'' corrections $t/P_z^2$ and $m_N^2/P_z^2$ to the short distance
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expansion of gauge-invariant nonlocal quark-antiquark operators sandwiched
between nucleon states with different momenta. Here $t$ is the momentum
transfer, $m_N$ is the nucleon mass and $P_z$ is the momentum component
in the direction of the quark-antiquark separation, which is assumed to be... -
Krzysztof Cichy (Adam Mickiewicz University)6/16/26, 10:00 AM
In this talk, we discuss the recent progress in lattice QCD determinations of generalized parton distributions. In particular, we present a unified neural-network-based framework to combine large momentum effective theory (LaMET, quasi-distributions) and short-distance expansion (SDE, pseudo-distributions) in a single analysis, with robust model-independent reconstruction of the x and the t...
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Christian Kummer (University of Cyprus)6/16/26, 11:15 AM
Nucleon Mellin moments of parton distribution functions and generalized parton distributions are computed up to the fourth order in lattice QCD. The computation is performed using one ensemble of twisted mass fermions at the physical pion mass point. We employ boosted frames to access the higher-order Mellin moments of generalized parton distributions. We also extract the generalized...
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Jakob Schoenleber (Technical University Munich)6/16/26, 11:45 AM
Within the soft collinear effective theory (SCET), we derive a factorization theorem which resums Sudakov logarithms $(\alpha_s\ln^2(-t))^n$ to all orders in the quark-in-quark generalized parton distribution (GPD) at large momentum transfer $t$, and perform a consistency check to one-loop. We show that the same Sudakov factor appears in the Feynman contribution to the GPDs of the...
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Feng Yuan (Lawrence Berkeley National Laboratory)6/16/26, 12:15 PM
I will talk about the near threshold photoproduction of Jpsi and its constrain on the gluonic gravitational form factors.
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Kostas Orginos (William & Mary)6/16/26, 2:15 PM
Extracting continuum MSbar PDFs from lattice pseudo-distribution or Ioffe-time matrix elements is a multi-layer inverse problem. The measured matrix elements depend not only on the desired leading-twist distribution, but also on perturbative matching and evolution, finite lattice spacing effects, excited-state contamination, and higher-twist contributions whose separation from leading twist is...
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Joshua Miller (Temple University)6/16/26, 2:45 PM
In recent years, the $x$-dependence of parton distribution functions (PDFs) has become accessible through non-local operators of a boosted hadron by utilizing techniques such as large momentum effective theory (LaMET) and short distance factorization (SDF). Embedded in these distribution functions are Mellin moments, which contain information on fundamental properties of hadrons, such as the...
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Gerald Miller (UW)6/16/26, 3:45 PM
The strong interaction is the fundamental force that holds quarks and the gluon force carriers together to form protons and neutrons and also holds the atomic nucleus together. The theory governing quark-gluon interactions is Quantum Chromodynamics (QCD). A wide variety of experimental data teaches us that quarks and gluons cannot be observed in isolation, a phenomenon known as confinement...
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Sara Collins (University of Regensburg)6/17/26, 9:30 AM
We present results for the first and second moments of the
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isovector unpolarised, polarised and transversity parton distribution
functions~(PDFs) of the nucleon, sigma and cascade baryons. Comparing
the moments of the octet enables flavour symmetry breaking to be
explored. The simulations cover a wide range of the parameter
space in terms of the lattice spacing, pion mass and spatial... -
Constantia Alexandrou (University of Cyprus and The Cyprus Institute)6/17/26, 10:00 AM
We will present our latest results on the second, third and fourth moments of the unpolarized PDF of the pion and the kaon using twisted mass fermion ensembles at the physical point. The reconstructed valence PDFs will be compared with phenomenological analyses.
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Yoshitaka Hatta (BNL)6/17/26, 11:15 AM
Within the collinear factorization framework based on Generalized Parton Distributions (GPDs), we calculate the spin density matrix of exclusively produced quark and antiquark pairs u\bar{u}, d\bar{d}, s\bar{s}, c\bar{c}, b\bar{b} in electron-proton scattering. The presence of both real and imaginary parts in the scattering amplitudes leads to a rich pattern of entanglement between the quark...
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Prof. Keh-Fei Liu (Lawrence Berkeley National Lab)6/17/26, 11:45 AM
The pressure–energy relations in the nucleon are derived from the gravitational form factors, which parameterize matrix elements of the energy-momentum tensor (EMT), together with EMT conservation. The static pressure distribution arising from the Lorentz trace part of the EMT, as manifested in the spatial stress $\frac{1}{3} T^{ii}$, equals minus the corresponding trace part of the energy...
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Simonetta Liuti (University of Virginia)6/18/26, 9:30 AM
Using the framework of GPDs and related multidimensional QCD observables, we developed an interpretation of connected and disconnected contributions emerging from the ab-initio Euclidean path-integral formulation of QCD. We provide a common description of nucleon elastic form factors, parton distribution functions, while elucidating nonperturbative contributions to deep-inelastic and exclusive...
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Zaki Panjsheeri (University of Virginia)6/18/26, 10:00 AM
AI/ML techniques are particularly apt for addressing the inverse problems posed by the extraction of generalized parton distributions from experimental data and lattice QCD (LQCD) results. In the Exclusives in AI/ML (ExclAIm) collaboration, we lay the foundation for the application of such techniques with a spectator model-based parameterization of valence, sea, and gluon GPDs that offers...
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Gunnar Bali6/18/26, 11:15 AM
Generalized parton distributions (GPDs) and light cone distribution amplitudes (LCDAs) are central for the understanding of hard exclusive processes. In collinear factorization, LCDAs correspond to lightfront wavefunctions, while parton distribution functions (PDFs) have a probabilistic interpretation, within the parton model limit. We present results for the lowest Mellin moments of meson and...
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Arianna Vercesi6/18/26, 11:45 AM
Transition distribution amplitudes (TDAs) are non-perturbative functions that emerge within the collinear factorized description of hard exclusive scattering processes involving the exchange of a non-zero baryon number. TDAs provide new information that complements and extends the insights provided by other non-perturbative quantities, such as generalized parton distributions and distribution...
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Andrea Shindler (RWTH -- Aachen University)6/18/26, 12:15 PM
Lattice QCD can provide complementary first-principles information for global analyses through Mellin moments of parton distribution functions. In this talk I will discuss a lattice-QCD approach based on gradient-flowed twist-two operators for the calculation of PDF moments, with particular emphasis on the possibility of accessing higher moments.
The gradient flow provides a useful way to...
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David Richards (Jefferson Lab)6/18/26, 2:15 PM
The calculation of gluonic and flavor-separated contributions to the structure of the nucleon and pion is considerably more computationally demanding than that of the isovector contributions. In this talk, I present recent work by the Hadstruc Collaboration aimed at computing gluonic contributions to the one-dimensional PDFs of the nucleon, and preliminary work on the gluonic contributions...
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Joseph Delmar (Argonne National Laboratory)6/18/26, 2:45 PM
We present a lattice QCD determination of the Mellin moments of the unpolarized gluon parton distribution function in the proton extracted from matrix elements of nonlocal gluon operators coupled to momentum-boosted proton states. The calculation is performed on an $N_f=2+1+1$ ensemble of maximally twisted mass fermions with clover improvement and the Iwasaki-improved gauge action, at a pion...
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Tanmay Maji (Department of Physics, National Institute of Technology Kurukshetra, India)6/19/26, 9:30 AM
The Wigner distributions (WDs) in boost-invariant longitudinal space for unpolarized, longitudinally polarized and linearly polarized gluons within a proton are presented in the framework of the light-front gluon spectator model inspired by AdS/QCD. The boost-invariant longitudinal space defined by the coordinate $\sigma=\frac{1}{2}b^- P^+$, can be accessed through the Fourier transformation...
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Andrea Schiavi (Università degli Studi di Pavia and Istituto Nazionale di Fisica Nucleare, Sezione di Pavia)6/19/26, 10:00 AM
Within light-front quantization, hadrons can be represented on a Fock-space basis of configurations of elementary partons. The coefficients of the expansion are called light-front wave functions (LFWFs), and encode all the dynamical degrees of freedom. We show how to extract the LFWFs of baryons, such as the proton, from equal-time correlators suitable for Lattice QCD simulations. Using an...
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