HUGS 2025

Session

Student seminars

Jun 11, 2025, 9:00 AM

CEBAF Center Rm. F113 (Jefferson Lab)

64. Valence quark distributions of spin-0 and spin-1/2 hadrons.

Navpreet Kaur

6/11/25, 9:00 AM

Understanding the quark dynamics becomes indispensable to portray the internal structure of hadrons. This structural anatomization is carried out by making the use of light-front dynamics to understand the behavior of each constituent quark flavor of hadrons, such as spin-0 and spin-1/2 particles. Generalized parton distributions (GPDs) provide valuable three-dimensional insights of these...

54. GEn-RP: Neutron Electric Form Factor Measurement at Q² = 4.4 (GeV/c)² via Charge Exchange Recoil Polarimetry at Jefferson Lab

Andrew Cheyne

6/11/25, 9:15 AM

The electromagnetic form factors of nucleons are fundamental observables that provide crucial constraints for theoretical predictions of hadron structure. The Super BigBite Spectrometer (SBS) program at Jefferson Lab (JLab) comprises a suite of experiments measuring nucleon electromagnetic form factors at high momentum transfer. This presentation focuses on GEn-RP, which aims to measure the...

50. Radially excited pion and kaon within a contact interaction

Axel Ahiezer Ortiz Villaseñor

6/11/25, 9:30 AM

We present a calculation of the electromagnetic form factors (EFF) of the radially excited and ground state for pion and kaon.
We have employed a Schwinger-Dyson equations treatment of a vector × vector contact interaction which preserves key features of quantum chromodynamics, such as confinement, chiral symmetry breaking, axial-vector Ward-Takahashi identity and low-energy...

40. The b1 Polarized Target Experiment

Muhammad Farooq (University of New Hampshire)

6/11/25, 9:45 AM

UNH (University of New Hampshire) Nuclear Group planning to run b1 and Azz experiment at JLab in Hall C using 11.0 GeV, High Luminosity electron beam 1038cm−2s−1 with 115 nA beam current, the 5T Superconducting magnet,ND3 polarized target and HallC stacked spectrometer to study the deuteron spin observables
and asymmetries on polarized beam and target. Additionally, UNH Nuclear Group will...

42. The all-charm tetraquark and its contribution to two-photon processes

Panagiotis Kalamidas

6/11/25, 10:15 AM

Prompted by several potential tetraquark states that have been reported by the LHCb, CMS, and ATLAS Collaborations in the di-J/Ψ and J/Ψ Ψ(2S) spectra, we investigate their contribution to two-photon processes. Within a non-relativistic potential model for the all-charm tetraquark states, we calculate the two-photon decay widths of these states and test model-independent sum rule predictions....

44. Hadron spectroscopy from the S-matrix perspective

Giorgio Foti (University of Messina & INFN Catania)

6/11/25, 10:30 AM

S-matrix theory is one of the most powerful framework to study the (un)stable states that populate QCD spectrum. In particular, it is very useful to extract physical properties of the "exotics" candidates - particles that cannot be described by ordinary quark model - in a non perturbative, phenomenological way. In this talk, I will introduce the so called N/D formalism, which is a technique to...

52. Impact of Dispersion Effects on Beam-Normal SSA in Spin-Zero Nuclei

Volodymyr Tereshchuk

6/11/25, 10:45 AM

Incorporating two-photon exchange (TPE) effects into the study of elastic lepton-nucleon/lepton-nucleus scattering is crucial for improving our description of the internal structure of nucleons and atomic nuclei, particularly in light of the inconsistencies in the proton electromagnetic form factor measurements. Current models accurately account for TPE effects in the calculation of...

49. Mapping the transverse spin sum rule in position space

Ravi Singh

6/12/25, 9:00 AM

We discuss in detail the relativistic spatial distribution of transverse angular momentum, including both orbital and intrinsic spin contributions.
Using the quantum phase-space formalism, we begin with the definition of the three-dimensional spatial distributions of transverse orbital angular momentum and intrinsic spin in a generic Lorentz frame.
By integrating these three-dimensional...

43. Incoherent DVCS on the Deuteron

Alan Sosa (Florida International University)

6/12/25, 9:30 AM

Incoherent DVCS on the Deuteron is a reaction that is sensitive to neutron GPDs. Extraction of neutron GPDs is necessary for the flavor separation of GPDs. I will discuss how to model this reaction and complications that arise such as different nucleon interferences and final state interactions.

57. Energy Deposition on Scintillating Tiles of the Barrel Hadronic Calorimeter at the Electron-Ion-Collider

Olaiya Olokunboyo

6/12/25, 9:45 AM

This work investigates energy deposition within the scintillating tiles of the Barrel Hadronic Calorimeter (BHCal) of the ePIC detector at the Electron-Ion Collider (EIC). The BHCal is central in calibrating jet energy scales, measuring hadronic final states, tagging charged-current Deep Inelastic Scattering (DIS) events, and identifying muons. Using simulation studies, we analyze how...

48. Proton Form Factor Ratio Measurements at High Momentum Transfer via Recoil-Polarization

Mahmoud Gomina (Virginia Tech)

6/12/25, 10:15 AM

This experiment aims to measure the ratio of the proton’s electromagnetic form factors (GEp/GMp), in elastic electron-proton scattering at high momentum transfers using polarized electron beam at JLab Hall A. Determining the polarization transfer to the recoiling proton provides direct access to the ratio of the electromagnetic form factors at electron energies up to 11 GeV. The experiment...

41. Dihadron Impact Study

yorgo sawaya (temple university)

6/12/25, 10:30 AM

We investigate the impact of potential measurements by the CLAS and SoLID collaborations at Jefferson Lab and the future Electron Ion Collider on the proton transversity distributions and their moments, the tensor charges.

53. The polarized photon distribution function

Lucas Palma

6/12/25, 10:45 AM

The parton distribution functions (PDFs) are a fundamental component of hard scattering processes. At leading order, they represent the probability of finding a parton with a momentum fraction x in a hadron target. With the increase in the accuracy of experimental measurements over the last few decades, it has become necessary to enhance the precision of theoretical calculations. To achieve...

56. The G-RWELL: a new high performance resistive MPGD

Elena Sidoretti

6/13/25, 9:00 AM

The novel G-RWELL Micro Pattern Gaseous Detector (MPGD) is a hybrid configuration that combines two technologies - Gas Electron Multiplier (GEM) and μ-RWELL - to achieve gas gains above 10^4. This makes it a cutting-edge solution for high-precision tracking applications.

The higher gas gain is reached thanks to the inclusion of a single GEM layer for signal pre-amplification, and it enables...

58. Exploring Photoproduced $\eta^{(}{'^{)}} \pi$ Systems in the Search for Exotic Hadrons at GlueX

Zachary Baldwin (Carnegie Mellon University)

6/13/25, 9:15 AM

Probing the non-perturbative regime of Quantum Chromodynamics (QCD) remains a critical challenge in hadron spectroscopy, particularly concerning the role of gluonic excitations in shaping the hadronic spectrum. The GlueX experiment at Jefferson Lab is designed to address this challenge through the search for exotic hybrid mesons, states predicted by QCD to include gluonic degrees of freedom...

61. Generalized Parton Distributions (GPD) from Timelike Compton Scattering (TCS)

Gyang Chung

6/13/25, 9:30 AM

Generalized Parton Distributions (GPDs) play a crucial role in advancing our understanding of the nucleon’s internal structure. They offer a unified framework to access the total spin of the nucleon, its mechanical properties, and a three-dimensional tomography of its constituents. Timelike Compton Scattering (TCS) provides a valuable probe of GPDs, particularly enabling access to the real...

66. Analysis of pion-SIDIS events with CLAS12 Data toward the Tensor TMD Studies on Deuteron

Hector Chinchay

6/13/25, 9:45 AM

CLAS12 RG-C collected data focusing on vector-polarized deuteron target, however contribution from tensor polarized target also exist in the data. Selection of pion-SIDIS events and extraction of tensor polarized contribution from unpolarized and vector polarized parts are necessary steps toward the study of tensor-polarized transverse-momentum-dependent parton distribution functions (TMDs)....

47. Measurement of the DVCS cross section with the Neutral Particle Spectrometer in Hall C at Jefferson Lab

Mr Hao Huang (Université Paris-Saclay)

6/13/25, 10:15 AM

Physicists have worked for decades to uncover the fundamental properties of nucleons since they are the building blocks of our visible universe. However, essential questions, such as how quarks and gluons contribute to the mass and spin of nucleons, still remain unresolved. Generalized Parton Distributions (GPDs), introduced in the 1990s, aim to address these questions by probing the...

55. Hybrid Baryons Search at CLAS12

Chiara Ammendola

6/13/25, 10:30 AM

An experimental program has been approved at the Thomas Jefferson National Accelerator Facility to measure the KY electroproduction reactions to search for new excited baryon states in the mass range from 1.8 GeV to 3 GeV with CLAS12. As part of this project two data taking campaigns took place in 2018 and 2024: despite its limited statistics the first run has proved to be of high quality...

68. A blind analysis for PRad-II experiment in the Hall B

Yining Liu

6/13/25, 10:45 AM

The PRad experiment at Jefferson Lab measured the proton charge radius using elastic electron-proton scattering at very low momentum transfer (a minimum Q^2 close to 2*10^-4 GeV^2 ), avoiding common systematic uncertainties by using a windowless cryogenic hydrogen gas target and a magnetic-spectrometer-free, calorimeter-based detector system. Its result favored a smaller proton radius,...