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Prof. C.-P. Yuan (Michigan State University)16/06/2025, 09:30
In this talk, I'll address the major challenges in determining the proton's longitudinal unpolarized parton distribution functions (PDFs), vital for Standard Model precision tests and New Physics exploration. Limitations stem from perturbative and nonperturbative QCD interactions, along with data analysis and statistical uncertainties.
Insights from LHC data inform future EIC PDF research....
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Dr Hyeon-Dong Son (Inha University)16/06/2025, 10:30
In this talk, we discuss the properties of the gravitational form factors (GFFs), obtained from the second Mellin moment of the pion and kaon generalized parton distributions (GPDs) within the framework of the nonlocal chiral quark model. Our results demonstrate that explicit chiral symmetry breaking significantly influences quark GPDs in kaon at large skewness, leading to substantial...
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Dr Manuel Schneider (National Yang Ming Chiao Tung University (NYCU))16/06/2025, 11:30
The EIC will measure the structure of hadrons at a new level of precision, requiring the support of a robust theoretical description. Universal properties of nuclei can be described by Parton distribution functions (PDFs). They provide insights into the non-perturbative internal structure of bound states. Calculating PDFs from first principles involves evaluating matrix elements with a Wilson...
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Prof. Yuji Goto (RIKEN)16/06/2025, 14:00
We have been studying the origin of the spin inside the proton using polarized proton collisions by the RHIC accelerator at Brookhaven National Laboratory in the United States. The proton spin cannot be explained by the spin of the quark inside the proton alone, but must be explained by the addition of the spin of the gluon and the orbital motion of the quark and the gluon inside the proton,...
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Prof. Tie-Jun Hou (University of South China)16/06/2025, 15:00
In this talk, I will focus on the current development and challenges in determining the longitudinal unpolarized proton parton distribution function (PDF) through global analysis, specifically on the impact of LHC data. Potential strategies for including lattice QCD inputs into global analyses are also discussed.
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Prof. Yang-Ting Chien (Georgia State University)16/06/2025, 16:30
We discuss the simultaneous measurements of jet electric charge of the jet region as defined in the one-jettiness of DIS events. On one hand, the jet charge allows for enhanced flavor separation of collinear parton distribution functions (PDFs) or helicity PDFs. On the other hand, the jet charge distributions as constrained by one-jettiness values probe flavor dynamics in the hadronization...
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Prof. Tanja Horn (Catholic University of America)17/06/2025, 09:30
Pions and kaons are, along with protons and neutrons, the main building blocks of nuclear matter. They are connected to the Goldstone modes of dynamical chiral symmetry breaking, the mechanism thought to generate nearly all hadron mass in the visible universe. The distribution of the fundamental constituents, the quarks and gluons, is expected to be different in pions, kaons, and nucleons....
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Prof. Wen-Chen Chang (Academia Sinica)17/06/2025, 10:30
In this talk, we will briefly review recent experimental and theoretical progress on the pion and kaon PDFs. Furthermore, we will provide quantitative evidence within the CEM and NRQCD frameworks that the existing pion-induced fixed-target J/psi and psi (2S) data are sensitive to the gluon density of pions and favor the pion PDFs with relatively large gluon contents at large x. The recent work...
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Dr Chia-Yu Hsieh (Academia Sinica, Taiwan)17/06/2025, 11:30
The partonic structure of the pion remains poorly understood due to the lack of direct pion targets. Current global fits of the pion parton distribution functions (PDFs) rely primarily on decades-old fixed-target Drell-Yan experiments (NA10 and E615), which are mostly sensitive to valence quarks. The CERN COMPASS experiment has provided new data by measuring Drell-Yan production using a...
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Prof. Huey-Wen Lin (Michigan State University)17/06/2025, 13:30
Recent advances in lattice QCD (LQCD), particularly large-momentum effective theory (LaMET) and related approaches, have enabled direct access to the Bjorken-$x$ dependence of hadron structure, going beyond LQCD's previous limitation to a few moments of distributions. These techniques open the door to first-principles calculations of parton distribution functions (PDFs) across a wide kinematic...
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Prof. Ross Young (University of Adelaide)17/06/2025, 14:30
The Compton amplitude offers a unifying lens through which to explore the structure of hadrons, connecting deep-inelastic phenomena with low-energy sum rules and nonperturbative dynamics. In this talk, I will present a series of lattice QCD investigations that leverage the Feynman-Hellmann relation to access this amplitude directly, enabling a systematic study of structure function moments,...
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Mr Sheng Pin Chang (Institute of Physics, National Yang Ming Chiao Tung University)17/06/2025, 16:00
The kaon light-cone distribution amplitude (LCDA) is a crucial quantity in understanding the structure of hadrons. In this work, we use lattice quantum chromodynamics (LQCD), a powerful tool for calculating non-perturbative quantities. Since LQCD calculations are performed in Euclidean space, we apply the heavy-quark operator product expansion (HOPE) to connect light-cone parton dynamics with...
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Prof. James Zanotti (The University of Adelaide)17/06/2025, 16:30
Lattice QCD is advancing our understanding of nucleon structure across a wide range of observables, tied together by a common goal: resolving how momentum and forces are distributed among quarks and gluons. I will begin with recent high-precision determinations of the isovector axial, scalar, and tensor charges, where a comprehensive treatment of systematic uncertainties is enabling meaningful...
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Prof. Swagato Mukherjee (Brookhaven National Laboratory)18/06/2025, 09:30
The Electron-Ion Collider (EIC) aims to explore the mysterious internal structure of protons by precisely probing their quark and gluon constituents through experiments. But observing these particles is just the first step—truly understanding them requires detailed insights from the theory known as Quantum Chromodynamics (QCD), which governs the behavior of these tiny building blocks. Lattice...
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Dr Wayne Morris (NYCU)18/06/2025, 10:30
The TMD soft function may be modeled by formulating the Wilson line in terms of auxiliary 1-dimensional fermion fields with complex directional vectors in Euclidean space. Using this approach we present a method for obtaining both the TMD soft function and the Collins-Soper kernel from lattice QCD. Our computation takes place in the region of the lattice that corresponds to the “spacelike”...
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Dr Valentin Moos (NYCU)18/06/2025, 11:30
After the conceptual improvements to transverse momentum dependent (TMD) extractions of a flavour dependent ansatz as well as a more robust propagation of uncertainties onto the resulting TMD functions in ART23, the following work ART25 is a state of the art determination of the unpolarised TMD parton distribution functions and -fragmentation functions such as the Collins-Soper kernel via a...
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Prof. Kyungseon Joo (University of Connecticut)18/06/2025, 14:00
The study of Deeply Virtual Exclusive Processes (DVEP) provides crucial insights into the three-dimensional structure of the nucleon by probing Generalized Parton Distributions (GPDs). These GPDs offer a comprehensive description of the spatial distribution of quarks and gluons within the nucleon and their contributions to its overall properties, including spin and mass. Key reactions, such as...
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18/06/2025, 15:00
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