#1 Double parton scattering in dihadron production
Alexander Fuerlinger
University of Tübingen
We study the effects of double parton scattering (DPS) in dihadron production with special interest in possible color correlations between the interacting partons. Therefore, the DPS cross section is calculated using the so-called pocket formula, which neglects any correlations, and with the help of the ChiliPDF library, which is evolving the needed double parton distributions, taking color correlations into account.
#2 Flowed gluon momentum fractions: A gradient flow-based renormalization approach
Alexandru Sturzu
William and Mary
The parton momentum fractions carry important information about the nucleon mass and spin decompositions. Specifically, determining the gluon contribution to nucleon momentum is a key step in achieving a better understanding of the nucleon structure. In this talk I present recent work by the HadStruc collaboration on determining the gluon momentum fraction from lattice quantum chromodynamics using a novel renormalization procedure based on the gradient flow, a nonperturbative damping of ultraviolet fluctuations. The ratio of three- to two-point correlation functions, constructed from nucleon and gluon operators, are used to build linear combinations of different matrix elements that ultimately provide access to the momentum fraction. The use of distillation and the variational method to improve the signal of the nucleon states will also be discussed. The nonperturbative renormalization and MS-bar scheme matching is done via a set of coefficients built from the short flow-time expansi on. The application of these coefficients are detailed.
#3 Pressure and stress inside Charmonia
Ashutosh Dwibedi
IIT Bhilai
In this work, we investigated the gravitational form factor (GFF) of charmonia by studying the energy-momentum tensor within the light front quark model (LFQM). We derived the A(Q^{2}) and D(Q^{2}) GFFs by including the spin-wave functions in LFQM. The A(Q^{2}) is found to obey the GFF sum rule A(Q^{2}=0)=1. From D(Q^{2}), we derived the transverse pressure and stress distribution inside the charmonia. Finally we compared our result with the basis light front quantization (BLFQ) predictions along with their respective radii.
#4 $B$ meson properties in dense resonance medium
Bhavana Tailor
Dr B R Ambedkar National Institute of Technology Jalandhar
The properties of heavy-flavoured hadrons in hot and dense matter are a critical probe of non-perturbative quantum chromodynamics. In the present work, we investigate in-medium modifications of scalar, pseudoscalar, vector, and axial-vector $B$ mesons. The analysis is performed within a dense hadronic medium that incorporates the nucleons, hyperons, and decuplet baryons. The primary significance of this investigation is to provide a theoretical baseline for understanding how properties of open-bottom hadrons are modified under the extreme conditions of heavy-ion collisions. Such modifications can potentially alter the decay patterns of excited bottomonium states, offering an alternative mechanism for $\Upsilon$ suppression and impacting other key experimental observables in heavy-ion collision experiments.
#5 Probing in-medium hadron properties through the chiral SU(3) quark mean field approach
Dhananjay Singh
Dr. B. R. Ambedkar National Institute of Technology Jalandhar
The modification of hadron structure in a dense and asymmetric nuclear environment remains a crucial aspect of understanding the non-perturbative regime of QCD and has direct relevance to the forthcoming Electron–Ion Collider (EIC) programme. In our work, we investigate the medium-induced changes in hadronic properties by employing the chiral SU(3) quark mean-field (CQMF) model in conjunction with light-front techniques. The in-medium effective quark masses obtained from the CQMF model serve as fundamental inputs for studying how baryonic density, isospin asymmetry, and temperature influence key hadronic observables, such as distribution amplitudes, parton distribution functions, and electromagnetic form factors. These studies provide a unified framework for exploring the interplay between chiral symmetry restoration and confinement effects in strongly interacting matter, offering valuable insights into the structural modifications of hadrons under extreme conditions relevant to nuclear astrophysics and high-energy collision experiments.
#6 Monte Carlo Phase Space Integration, Exploring ISR with veto algorithm
Essma Redouane Salah
University of M’sila
#7 Pion generalized parton distributions at zero skewness
Fernando Chandra
Universitas Indonesia
The internal structure of the pions in terms of the quark-gluon dynamics remains a significant challenge in hadron physics. In this study, the structure of the pion is investigated through the generalized parton distribution (GPD) in the framework of the covariant Nambu–Jona-Lasinio model, which respects the spontaneous chiral symmetry breaking, alongside the proper time regularization scheme to resolve the quark divergent and simultaneously to simulate quark confinement. By evaluating the pion parton distribution function from the forward limit of the pion GPD and generalized form factors from the Mellin moment of the pion GPD, we present our predictions on the scalar, tensor and electromagnetic form factors and their charge radii in comparison with the existing experimental data, and recent lattice QCD simulation, while the results of the pion GPD in the forward limit are compared with available data and JAM global analysis. Our prediction results on the pion PDFs and generalized form factors presented in this work are potentially testable by future experiments.
#8 Aspects of semi-inclusive DIS at NNLO
Juliane Haug
University of Tübingen
The hard scattering coefficients for semi-inclusive deep-inelastic scattering (SIDIS) at NNLO, which will be needed to accurately interpret EIC measurements, where recently calculated by two groups. My poster will showcase how we compactified these results through removing spurious case distinctions in the kinematic (x,z)-plane by introducing single-valued polylogarithms. Such a compact representation is relevant for example in the context of (polarized) PDF extraction, where the hard coefficients are called many times, such that a short computation time is paramount.
Based on 2505.18109 and 2211.14110.
#9 Dense QC_2D_2 with uniform matrix product states
Kohei Fujikura
YITP
We explore (1+1)-dimensional cold and dense single flavor SU(2) gauge theory using uniform matrix product states. Ground states are constructed by variational uniform matrix product states by minimizing the Hamiltonian with and without a baryon chemical potential. Some thermodynamical quantities, including pressure and the expectation value of the baryon density, are estimated with a remarkable precision.
#10 S-wave kaon-nucleon interactions and $\Theta^+$ pentaquark from lattice QCD
Kotaro Murakami
Institute of Science Tokyo
Interactions between a meson and nucleon play an important role in a variety of phenomena such as the partial restoration of chiral symmetry and the structure of exotic hadrons and nuclei. Although low-momentum kaon-nucleon scattering experiments have been conducted since the 1960s, our understanding of the interactions remains limited due to a lack of experimental data near the threshold, making it difficult to accurately elucidate the related physics. On the other hand, recent developments in computational power and lattice QCD techniques have enabled a precise determination of hadron interactions from first principles. In this study, we investigate the S-wave kaon-nucleon interactions in lattice QCD using the time-dependent HAL QCD method. The calculation is performed with $N_f=2+1$ quark flavors at the physical point, $m_{\pi}\approx 137$ MeV. The resulting interaction potential has a repulsive (weak attractive) behavior for isospin $I=1$ ($I=0$). The extracted phase shifts indicate the absence of bound or resonant states corresponding to the $\Theta^{+}$ pentaquark in this system.
#11 Probing Fundamental-Constant Variation and Nucleon Structure via Scalar-Field Dynamics
Le Duc Thong
Dong Nai Technology University
ariations in the gravitational constant G can arise from dynamical scalar fields that couple to matter through Yukawa interactions, modifying the Higgs vacuum expectation value and, consequently, quark masses and QCD dynamics. Such couplings induce correlated shifts in nucleon properties and parton distributions, potentially affecting observables accessible at the Electron-Ion Collider. By linking G-variation, Higgs VEV shifts, and QCD evolution, this framework provides a novel interface between cosmological scalar-field physics and nucleon structure. High-precision EIC measurements can thus probe signatures of scalar-mediated fundamental-constant variation, offering a unique window into the interplay of strong interactions and beyond–Standard-Model physics.
#12 NLO corrections in pA scattering dijet production within the CGC dilute-dense formalism
Marcos Guerrero Morales
Temple University
At high energies, experiments show that the parton density inside hadrons grows rapidly. This growth is expected to be tamed by nonlinear gluon–recombination effects, leading to a saturated state of nuclear matter. The Color Glass Condensate (CGC) provides an effective field theory framework to describe partonic interactions in this high-density regime. One of the most promising observables to probe saturation is dijet production in proton–nucleus (pA) scattering. However, several mechanisms compete with saturation effects in this process, making it essential to improve the current theoretical precision. Up to now, this observable has only been fully calculated at leading order (LO). In this poster, I will present our progress toward next-to-leading-order (NLO) calculations of dijet production in pA scattering in the gluon-initiated channel. In particular, I will discuss our results for the real corrections and show that, in the phenomenologically important back-to-back limit, the resulting cross section factorizes in terms of quark transverse-momentum–dependent distributions (TMDs).
#13 Lattic study of stress-tensor distribution around the flux tube
Masakiyo Kitazawa
YITP, Kyoto University
We explore the distribution of the stress-energy-momentum tensor around the flux tube in SU(3) Yang-Mills theory in lattice Monte Carlo simulations.
#14 In-medium distribution functions of hadrons using light-front dynamics
Navpreet Kaur
Dr. B. R. Ambedkar National Institute of Technology Jalandhar, Punjab-144008, India.
We present the tomographical structure of hadrons by studying the quark-quark correlator. The required in-medium quark properties are computed from the chiral SU(3) quark mean field model, which are used as inputs to portray the tomographical structure of hadrons via distribution functions. These distributions are studied with light-front formalism by considering purely transverse momentum transfer, i.e., zero skewness. The outcomes of this study further suggest that the medium effects at the quark level play a crucial role, reflecting the effect of the partial restoration of the chiral symmetry.
#15 TMD factorization for diffractive production of massive quarks in photon-nucleus collisions
Patricia Gimeno-Estivill
University of Jyväskylä
We study the diffractive production of a massive quark pair in coherent photon-nucleus collisions within the Color Glass Condensate framework. We work in the correlation limit, where we explicitly distinguish between hard and semi-hard scales. In a first study, we consider the emission of an unmeasured semi-hard gluon with transverse momentum of the order of the saturation scale by the massive quark pair. In this regime, the differential cross section factorizes into a mass-dependent hard factor, which describes the formation of the quark-antiquark, and the diffractive gluon transverse momentum dependent (TMD) distribution. In a second study, we consider the production of a semi-hard quark and a hard antiquark and gluon, which have transverse momenta much larger than the saturation scale. We then factorize the differential cross section into a mass-independent hard factor and a mass-dependent quark diffractive TMD distribution. Our results are the base for future phenomenology predictions for quarkonium and open charm production in the saturation regime in ultraperipheral collisions at the LHC.
#16 Finite volume effects on two-pion correlation functions on the lattice
Sakura Itatani
KEK / SOKENDAI
Lattice QCD is a numerical method serving as a non-perturbative approach to QCD. Correlation functions, which contain information about the intermediate states (and their excited states) in the form of the spectral function, are calculated on the lattice. Extracting the spectral function from the correlators, however, is an ill-posed problem. The spectral function becomes discrete in finite volumes, which is not enough to learn about most hadronic states (resonance states, multi-particle states, etc.). We must know the volume dependence of lattice correlators and take the large volume limit before obtaining the spectral function. In this study, we derive an analytical representation of the two-pion correlation function on a finite-volume lattice. We decompose the correlator by the states in the finite volume and use the large-volume asymptotic solution of Lüscher's quantization condition. Our analysis provides insight into which variables can be extracted from the lattice correlators and at what accuracy.
#17 Spin-flip gluon generalized transverse-momentum-dependent parton distribution F_{1,2} at small x
Sanskriti Agrawal
Aligarh Muslim University
Until recently the spin-flip processes in the deep inelastic scatterings are thought to be suppressed in the high energy. We found a positive intercept for the spin-flip generalized transverse momentum-dependent parton distribution (GTMDs) Re(F_{1,2}). This is done by analytically solving the integro-differential evolution equation for Re(F_{1,2}). Interestingly, the surviving solution corresponds to conformal spin n=2. As the imaginary part of F_{1,2}, is related to the spin-dependent odderon or gluon Siver function and scales as Im(F_{1,2}) ~ x^0, the positive intercept for Re(F_{1,2}) implies that it is expected to dominate over the gluon Siver function in the small-x limit and may directly impact the modeling of unpolarized GTMDs and associated spin-flip process in the upcoming Electron-Ion Collider.
Ref: S. Agrawal, N. Vasim, R. Abir, Phys. Rev. D 109, 074039 (2024)
#18 Polarized Nucleon Tomography from a Quantized Skyrmion
Tomoya Uji
The University of Tokyo
The future Electron-Ion Collider will access the nucleon energy-momentum tensor (EMT). We investigate polarized nucleon structure in a quantized Skyrme-soliton model with explicit vector mesons. We compute EMT form factors and Breit-frame 3D densities, and compare canonical and Belinfante constructions. Vector degrees of freedom generate an explicit spin current, enabling a local orbital-spin decomposition that is absent in the Belinfante picture. We show that pseudogauge transformations leave global charges intact but reshuffle local stress and angular-momentum distributions, clarifying which features are fixed at leading twist and which require beyond-leading-twist sensitivity.
#19 NNLO QCD corrections to electroweak structure functions in semi-inclusive DIS
Vaibhav Pathak
The Institute of Mathematical Sciences
We present results for semi-inclusive deep-inelastic scattering (SIDIS) mediated by electroweak gauge bosons at next-to-next-to-leading order (NNLO) in perturbative quantum chromodynamics. The results include all relevant structure functions arising from both neutral and charged current interactions, incorporating contributions from all partonic channels with full flavor dependence. A numerical analysis of the NNLO corrections demonstrates their phenomenological importance, revealing sizable effects and a significant reduction in residual scale dependence in the kinematic range probed by the future Electron-Ion-Collider EIC. These results will serve as a critical input for future global extractions of parton distributions (PDFs) and fragmentation functions (FFs).
#20 Impact Study of Future Dihadron Experiments at Jeffeson Lab and the Electron Ion Collider
Yorgo Sawaya
Temple University
We investigate the impact of future experiments at Jefferson Lab (JLab) and the Electron-Ion Collider (EIC) on the nucleon’s transversity distributions and tensor charges, focusing on dihadron production in semi-inclusive deep-inelastic scattering. For this study, we consider JLab (CLAS and SoLID) pseudo-data for proton, deuteron, and $^3$He targets, as well as EIC pseudo-data for proton and $^3$He targets. The pseudo-data are generated based on the latest extraction of the transversity distributions and dihadron fragmentation functions from the JAM Collaboration. We find that future CLAS data can lead to significant constraints on the up-quark transversity in the region of intermediate $x$ and provide insight into the possible tension between tensor charges extracted from experimental data and those obtained from lattice QCD. SoLID measurements will further improve sensitivity to the down‑quark transversity and its tensor charge, offering complementary coverage to CLAS. Finally, future EIC data will improve the determination of transversity distributions across a wide kinematic range, particularly at low $x$.
#21 Three-dimensional structure of the proton from a light-front Hamiltonian method
Zhi HU
Field Theory Research Team, RIKEN Center for Computational Science
The three-dimensional internal structures of the proton play a central role in the upcoming electron-ion colliders, among which TMDs have received increasing attention. They depict the proton in three-dimensional momentum space, and, via TMD factorization and evolution, can be connected to the cross-section of the SIDIS process. In this talk, we use the light-front wave functions calculated using a light-front Hamiltonian method to obtain all eight leading-twist quark TMDs. We expand the gauge link of TMD correlators to the first order and use the famous OGE approximation for T-odd TMDs. After investigating some properties of the obtained initial-scale TMDs, we further compute SIDIS observables measured in JLab, COMPASS and HERMES. Comparison with experimental measurements reveals good consistency.
#22 Gravitational form factors of the baryon octet in holographic QCD
Zhibo Liu
Nagoya University
We investigate the gravitational form factors (GFFs) of hadrons to reveal their internal distributions of energy, momentum, and pressure. The analysis is carried out within two complementary effective frameworks: holographic QCD and the Nambu–Jona-Lasinio (NJL) model. In holographic QCD, the form factors A(t), B(t), and D(t) are extracted from the five-dimensional coupling between the bulk gravitational field and the boundary energy–momentum tensor, providing a geometric description of hadron structure. In the NJL model, the same quantities are obtained from quark-loop and Bethe–Salpeter calculations, reflecting the underlying chiral dynamics. The two approaches show consistent physical trends in the mass and pressure distributions, offering complementary insights into the energy–momentum tensor structure of hadrons.
#23 Probing the $X$(6900) via Two-Photon Production in Ultraperipheral Collisions
Longjie Chen
Institute of Nuclear Physics Polish Academy of Sciences
In this work, we perform a leading-order calculation within the NRQCD factorization framework to determine the short-distance coefficients(SDCs) for the exclusive processes $\gamma\gamma\to T_{4Q}(0^{++})$ and $\gamma\gamma\to T_{4Q}(2^{++})$. Using these results, we compute the two-photon decay widths, $\Gamma(T_{4c}\to\gamma\gamma)$, expressed in terms of the corresponding non-relativistic QCD(NRQCD) long-distance matrix elements(LDMEs). Our findings offer crucial theoretical input for ongoing experimental searches in UPCs at the LHC and establish a quantitative basis for using two-photon processes to distinguish between competing structural models of the $X$(6900).
