Conveners
Structure of hadrons and nuclei
- Kehfei Liu
Structure of hadrons and nuclei
- Dimitra Pefkou
Structure of hadrons and nuclei
- Marcel Rodekamp (Universität Regensburg)
Structure of hadrons and nuclei
- Dipankar Chakrabarti (IIT Kanpur)
Structure of hadrons and nuclei
- Gunnar Bali (Universität Regensburg)
Structure of hadrons and nuclei
- Christopher Monahan
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Christopher Monahan04/11/2025, 14:50Talk
The HadStruc Collaboration is engaged in a long-term program to extract the partonic structure of hadrons from first principles. I will review our on-going work on the gluon momentum fraction and the x-dependent isoscalar quark structure of the nucleon. The gluon momentum fraction is central to understanding the origin of mass in hadrons and a benchmark quantity for lattice calculations of...
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Christian Zimmermann (University of Kentucky)04/11/2025, 15:10Talk
The hadronic tensor is the central non-perturbative object in the calculation of the cross section of lepton-hadron interactions like neutrino-nucleon scattering. It is usually parameterized in terms of structure functions, which encode all necessary information independently of the kinematic region. Moreover, the hadronic tensor can be factorized in terms of parton distribution functions...
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Emilio Taggi (Forschungszentrum Juelich, Bonn University)04/11/2025, 15:30Talk
Using forward matrix elements of local leading twist operators, we present a determination of the third Mellin moments $\left< x^2 \right>$ of nucleon's unpolarized, polarized and transversity parton distribution functions.
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Two lattice QCD ensembles at the physical pion mass are used: these were generated using a tree-level Symanzik-improved gauge action and $2+1$ flavor tree-level improved... -
Dimitra Pefkou04/11/2025, 15:50Talk
PDFs are universal functions appearing in factorizations of various processes relevant to collider phenomenology; many methods exist to determine their $x$ dependence in lattice QCD, but precision determinations remain challenging. Mellin moments of PDFs can be defined in terms of matrix elements of local operators in lattice QCD, but direct determinations besides $<x>$ run into challenges...
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S.-P. Alex Chang (Institute of Physics, National Yang Ming Chiao Tung University, Taiwan)04/11/2025, 16:40Talk
The light-cone distribution amplitude (LCDA) is a fundamental non-perturbative quantity for understanding hadron structure. We report on our calculation of the pion and kaon LCDAs using the heavy-quark operator product expansion (HOPE) framework. This method employs an OPE analysis of hadronic amplitudes through the inclusion of a fictitious valence heavy quark, and has previously been shown...
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Benjamin Luke (Baylor University)05/11/2025, 09:00Talk
Understanding a hadron’s electric and magnetic polarizabilities allows one to access internal structural information. Traditionally, the external field two-point function method has been used to calculate polarizabilities. However, recent work has demonstrated the effectiveness of using four-point functions for computing polarizabilities of charged and neutral hadrons. Our previous study on...
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Vaibhav Chahar (Jagiellonian University, Poland)05/11/2025, 09:20Talk
Instanton liquid model is believed to capture the main features of vacuum QCD dynamics. Recently, multiple predictions for hadron structure functions have been derived and compared with experimental measurements and lattice QCD calculations, finding a general agreement. In order to explore the precision of the instanton liquid model, one has to compare its predictions with non-perturbative...
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Ajay Shanmuga Sakthivasan (HISKP, University of Bonn)05/11/2025, 09:40Talk
The calculation of the hadronic form factors on the lattice provides important information about the internal structure of the corresponding states. However, calculating the form factor for unstable states, viz. resonances, is not as straightforward, both from the conceptual point of view and in terms of technical implementation. In this work, we specifically consider the electromagnetic form...
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Masato Nagatsuka (Tohoku University)05/11/2025, 10:50Talk
We present the results of the nucleon axial-vector charge based on PACS10 gauge ensembles. These ensembles are generated by PACS Collaboration using stout-smeared O(a) improved Wilson-clover quark action and Iwasaki gauge action, and they are characterized by the spatial extent of 10 fm and three lattice spacings 0.09 fm, 0.06 fm and 0.04 fm. In particular, the latest update at 0.04 fm is...
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Jun-Sik Yoo (Los Alamos National Laboratory)05/11/2025, 11:10Talk
The determination of the lattice scale with high precision is a prerequisite for extracting reliable physical results from lattice QCD. We present an analysis of scale setting using 2+1-flavor Wilson–clover ensembles generated by the JLab/W&M/LANL/MIT/Marseille collaborations with the Hybrid Monte Carlo algorithm. These ensembles span a broad range of lattice spacings ($0.056 \leq a \leq...
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Marcel Rodekamp (Universität Regensburg)06/11/2025, 14:30Talk
We present progress towards a high-precision lattice QCD study of the nucleon’s isovector vector form factors, which encode key aspects of the nucleon’s spatial structure and its response to electromagnetic probes. We utilize the Coordinated Lattice Simulations (CLS) ensembles generated with $N_f =2+1$ non-perturbatively $O(a)$ improved Wilson fermions and a tree-level Symanzik-improved gauge...
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Alessandro Barone (Johannes Gutenberg University Mainz)06/11/2025, 14:50Talk
We present our work on the computation of the axial form factor of the nucleon from lattice QCD. We employ a set of $N_f=2+1$ CLS ensembles with $O(a)$-improved Wilson fermions and the Lüscher-Weisz gauge action, with lattice spacings ranging from $0.05\,\text{fm}$ to $0.086\,\text{fm}$ and pion masses spanning between $130\,\text{MeV}$ and $350\,\text{MeV}$. To control excited-state effects,...
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Kehfei Liu06/11/2025, 15:10Talk
From the conservation of the energy-momentum tensor, we show that the pressure distribution in the hadrons are due to the difference of the trace and traceless parts of the spatial distribution of T^{ii}, which can be obtained from the gravitational form factor
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A (q^2) and the mass form factor G_m (q^2). Furthermore, we derive the pressure-energy equations of state for the respective... -
Bhavna Prasad (The Cyprus Institute)06/11/2025, 15:30Talk
We present the strange electromagnetic form factors of the nucleon using lattice QCD with $N_f=2+1+1$ twisted mass clover-improved fermions and quark masses tuned to their physical values. Using four ensembles with lattice spacings of $a=0.080$ fm, $0.068$ fm, $0.057$ fm and $0.049$ fm, and similar physical volume, we obtain the continuum limit directly at the physical point. The disconnected...
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Wayne Morris (National Yang Ming Chiao Tung University)07/11/2025, 16:40Talk
The Collins-Soper (CS) kernel may be obtained through the TMD soft function by formulating the Wilson line in terms of 1-dimensional auxiliary fermion fields on the lattice. Our computation takes place in the region of the lattice that corresponds to the “spacelike” region in Minkowski space, i.e., Collins' scheme. We explore two methods for obtaining the CS kernel. The "ratio method"; which...
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Swagato MukherjeeTalk
Transverse-momentum-dependent parton distributions (TMDs) are essential for unraveling the three-dimensional structure of hadrons, forming a core scientific component of the Electron-Ion Collider (EIC) program. Employing a novel Coulomb-gauge-fixed lattice QCD approach at physical quark masses, we reliably access transverse separations up to approximately 1 fm, corresponding to the small...
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Manuel Schneider (National Yang Ming Chiao Tung University)Talk
The rich internal structure of hadrons is encoded in partonic functions, such as parton distribution functions (PDFs) and light-cone distribution amplitudes (LCDAs), which are crucial in collider experiments and decay processes. Calculating them from first principles remains a major challenge: they require matrix elements with a Wilson line along a light-like direction, which is not directly...
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David Richards (Jefferson Lab)Talk
The HadStruc collaboration is pursuing a program aimed at understanding the three-dimensional internal structure of the nucleon encapsulated in the Generalized Parton Distributions (GPDs) and Generalized Form Factors (GFFs) within the short-distance factorization approach. I present recent work by HadStruc on the isovector GFFs of the nucleon, including those corresponding to non-zero...
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Tanmoy Bhattacharya (Los Alamos National Laboratory)Talk
We present an update on the Los Alamos collaborations' calculations of the spectrum, charges, form-factors, and electric dipole moments of nucleons using lattice QCD. Our calculations are done using Wilson-Clover fermions on both Clover and MILC collaboration's HISQ gauge configurations. These ensembles include multiple lattice spacings down to 0.04 fm, and multiple isospin-symmetric pion...
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