Conveners
Student Seminars
- CHAIR: Pia Jones Petrak (JLab)
Student Seminars
- CHAIR: Pia Jones Petrak (JLab)
Student Seminars
- CHAIR: Ming Li (Jefferson Lab)
Student Seminars
- CHAIR: Ming Li (Jefferson Lab)
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Benjamin Spaude (William & Mary)6/10/26, 9:00 AMSeminar
Over the past three decades at Jefferson Lab, there have been multiple experiments aimed at understanding the internal structure of nucleons. This is often done by measuring the electromagnetic form factors (FF) of these nucleons, at an increasingly higher momentum transfer squared, $Q^2$. The last of these experiments is GEp-V, which aims to measure the ratio of the electromagnetic form...
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Payton Arber (The George Washington University)6/10/26, 9:15 AMSeminar
When a meson decay violates isospin symmetry, it often signals electromagnetic or weak effects, since the strong interaction approximately conserves isospin. The decays $η→π^+π^−π^0$ and $η→3π^0$, however, are an important exception: they are hadronic decays driven primarily by strong isospin breaking from the up-down quark mass difference. Because the leading electromagnetic contribution is...
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Hunter Duggin (University of North Carolina)6/10/26, 9:30 AMSeminar
The strongly coupled regime of quantum many-body physics continues to pose a formidable challenge in modern physics. A premier system used to explore this realm is the unitary Fermi gas (UFG), which is characterized by an infinite s-wave scattering length that leads to universal, conformal physics. While the thermodynamic and hydrodynamic properties of the UFG have been extensively studied,...
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Esteban Molina (UMICH, UTFSM (previously))6/10/26, 9:45 AMSeminar
Hadronisation, a dynamic process where coloured objects transition into colourless bound states, is an important phenomenon tied to the understanding of strong interactions. Particularly, this process has a different behaviour in nuclear environments in comparison to vacuum, and this difference can be used to know more about the dynamics of the hadronising objects [1].
The hadronic...
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Sameer Jain (Catholic University of America)6/10/26, 10:00 AMSeminar
The pion, as the lightest meson and a quark--antiquark bound state, provides an important testing ground for understanding the transition between nonperturbative and perturbative Quantum Chromodynamics (QCD). The Jefferson Lab experiment E12-19-006 extends precision measurements of the pion form factor to $(Q^2 \approx 6~\mathrm{GeV}^2)$ and allows for measurements up to $(Q^2 \approx...
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Uditha Weerasinghe (Mississippi State University)6/10/26, 10:30 AMSeminar
Semi-Inclusive Deep Inelastic Scattering (SIDIS) provides a powerful tool for studying nucleon structure and hadronization. In particular, Λ hyperon production is sensitive to strange-quark dynamics through its self-analyzing weak decay and spin structure. This work investigates Λ electroproduction in both the current fragmentation region (CFR) and target fragmentation region (TFR) using...
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KAZUKI MAKINO6/10/26, 10:45 AMSeminar
Dihadron fragmentation functions describes the probability of observing a pair of hadrons fragmenting from a quark. It involves an invariant scale associated to the relative internal motion of the dihadron system $M_h^2$ in addition to the overall hard scale $Q^2$. Evolution in $M_h^2$ varies continuously from nonperturbative to perturbative region. We demonstrate how to evolve Dihadron...
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Aden Whitney (University of New Hampshire)6/10/26, 11:00 AMSeminar
In preparation for the tensor-polarized target experiment in Jefferson Lab's Hall C, running simulations to predict polarization spin-up and relaxation times would provide additional time-scale data beyond what we can get from experimentation alone. However, previous solutions to the spin-1 polarization rate change equations have made assumptions or errors that conflict with each other and our...
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Margherita Sagina (University of Pisa)6/10/26, 11:15 AMSeminar
In recent years, there has been a notable interest in investigating hypernuclear systems, which provide a unique laboratory for studying strong interactions in the strange quark sector. One of the main applications is related to the so-called "hyperon puzzle" in neutron stars, where theoretical models including hyperons predict maximum masses of \sim 1.5 M_{\odot} or less, in conflict with...
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Shannen Graham-Howard (UMass Amherst)6/10/26, 11:30 AMSeminar
A critical test for low-energy QCD is the decay of the neutral pion. Comparing this analytic prediction with measured data thus provides a valuable test for low energy QCD and symmetry breaking. The lifetime of the $\pi^0$ can be measured using exclusive $\pi^0$ photoproduction in the Coulomb field of a nucleus, referred to as the Primakoff effect. Using this technique, the PrimEx-I and II...
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Mathieu Ronayette (CEA Saclay)6/11/26, 9:00 AMSeminar
Exclusive $\phi$ meson electroproduction is a promising channel to investigate the gluonic structure of the nucleon. The objective of this analysis is to extract the cross section for $\phi$ electroproduction on the neutron using CLAS12 RG-B data collected with a deuterium target. The $\phi$ meson is reconstructed through its $K^+K^-$ decay channel.
The analysis focuses on event selection,...
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Pramila Pokhrel (Catholic University of America)6/11/26, 9:15 AMSeminar
The deuteron, as the simplest neutron-proton bound state, provides a unique opportunity as a starting point to study short-range nuclear dynamics and nucleon-nucleon interactions at high momentum transfer without any complications which usually arise from heavy atoms. At large four-momentum transfer ($Q^2 \approx 4.5~\mathrm{GeV}^2$) and Bjorken $x > 1$, E12-10-003 experiment which was...
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Subhadip Pal on behalf of STAR Collaboration (Czech Technical University in Prague)6/11/26, 9:30 AMSeminar
Measurements of heavy flavor production in proton-proton ($p+p$) collisions are critical for testing perturbative QCD (pQCD) calculations and serve as an essential baseline for studying nuclear matter effects in heavy-ion collisions. In this presentation, we will report on the production of $D^0$ and $D^*$ mesons in $p+p$ collisions at a center-of-mass energy of $\sqrt{s} = 510$ GeV, utilizing...
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Addison Kovats-Bernat (William & Mary)6/11/26, 9:45 AMSeminar
In experimental hadron spectroscopy, we are concerned with indirect measurements of short-lived bound states, known as resonances. While many of these resonances can be described within the quark model, some have quantum numbers that are forbidden by a two- or three-quark system, meaning that they must have some other internal structure. Resonances themselves are complex poles of the...
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Rana Urek6/11/26, 10:15 AMSeminar
Over the past several decades, lattice quantum chromodynamics (LQCD) has developed into a powerful non-
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perturbative tool for extracting hadronic scattering amplitudes from first principles. The theoretical foundation
connecting finite-volume spectra to infinite-volume scattering observables was established by Luscher for two-body
elastic scattering and has since been extended to coupled... -
Yonggang Ren6/11/26, 10:30 AMSeminar
Two-particle matrix elements play a central role in understanding nucleon structure, for instance in determining the form factors of unstable resonances such as the ρ meson, which are nearly inaccessible experimentally. While their general features have been analyzed in various theoretical frameworks, a complete lattice-QCD determination of the corresponding amplitudes remains ongoing. Because...
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Addison Arcuri (Temple University)6/11/26, 10:45 AMSeminar
A summary of research on precision Møller polarimetry in Hall A at Jefferson Lab. Topics include determination of polarimeter DAQ dead times, accidental coincidence corrections, and other effects. The 0.40% uncertainty goal for polarimetry in the upcoming MOLLER experiment is more stringent than for previous Hall A Experiments, necessitating such improvements. Newly determined dead time...
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Aleksandr Bulgakov (University of Connecticut)6/11/26, 11:00 AMSeminar
Protons in the CLAS12 Forward Detector lose energy while passing through detector material, mainly through ionization, which shifts the reconstructed momentum away from the true value. This effect worsens momentum resolution and introduces biases into reconstructed kinematics, making energy loss corrections necessary for precision physics analysis.
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We study machine-learning-based approaches...