[Theory-seminars] Theory Seminar Monday at 1:30PM - JSA/HUGS fellowship recipients

[Caroline Silva Rocha Costa]

Dear all,

On Monday, June 17th, the theory seminar will be given by this year's 4 JSA/HUGS fellowship recipients: Nisha Chahal, Poonam Choudhary, Ramiro Martinez, and Gustavo Paredes. They will be visiting the group and the Lab for the next 2 weeks after participating in HUGS and are very eager to discuss physics with you all.

The seminar will happen exceptionally at 1:30PM, due to schedule conflict with the JLab 22 GeV Open Discussion starting at 12:30PM. Each presentation will be around 15min long plus time for questions, but overall we will meet for about 1h30 to give all four fellows time to receive thoughtful feedback.

Please, join us in CEBAF Center room CC L102 or on the zoom link below and welcome the fellowship recipients, who will be with us at the Lab for the next 2 weeks. We will also provide cake for this seminar.

https://jlab-org.zoomgov.com/j/1607118458?pwd=QU5SQVFCajNIblVFYm8xZ0laOGE1QT09
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Please, find titles and abstracts of the talks below.

Theory Seminar
Monday, June 17th at 1:30 PM, CC L102


Nisha Chahal (Dr. B. R. Ambedkar National Institute of Technology)
Will discuss “Impact of finite volume and external magnetic field on the properties of quark matter”

Abstract:
In this study, we examine the impact of finite volume and magnetic fields on the thermodynamic properties of isospin asymmetric quark matter using the Polyakov loop extended chiral SU(3) quark mean field (PCQMF) model at finite chemical potential and temperature. By employing the mean-field approximation to evaluate scalar and vector field values within the PCQMF framework, we derive key thermodynamic properties: pressure density, entropy density, and energy density. We also analyze the susceptibilities of conserved charges in strongly interacting matter across various system sizes and magnetic field strengths. Our results reveal a significant shift in the phase boundary towards higher quark chemical potential ($\mu_q$) and temperature (T) with decreasing system volume, while an increasing magnetic field induces a shift towards lower temperature and quark chemical potential. Additionally, we observe an enhancement in the fluctuations of conserved charges around the transition temperature. These findings have important implications for interpreting thermodynamic observables derived from heavy-ion collision experiments.


Poonam Choudhary (IIT Kanpur)
Will discuss "Gluon distributions inside the proton"

Abstract:
We formulate a light-front spectator model for the proton incorporating the gluonic degree of freedom. We investigate the helicity distribution which is consistent with existing experimental data and satisfies the perturbative QCD constraints at small and large longitudinal momentum of gluon in this model. We present the transverse momentum dependent distributions (TMDs) for gluon in this model. In terms of GPDs at non-zero skewness, we also investigate the entire three-dimensional representation of gluons. We address the total angular momentum contribution of the gluons by using the Ji's sum rules and also give our predictions for the kinetic orbital angular momentum in the light-cone gauge.


Ramiro Martinez (Universidad de Buenos Aires)
Will discuss “Fragmentation Functions in Nuclear Media”

Abstract:
We perform phenomenological analysis of how well hadronization in nuclear environments can be described in terms of effective fragmentation functions. The medium modified fragmentation functions are assumed to factorize from the partonic scattering cross sections and evolve in the hard scale in the same way as the standard or vacuum fragmentation functions. Based on precise data on semi-inclusive deep-inelastic scattering off nuclei and hadron production in deuteron-gold and proton-lead collisions, we extract sets of effective fragmentation functions for pions NLO accuracy.


Gustavo Paredes (U. of Michoacan)
Will discuss “Baryon structure in terms of diquarks”

Abstract:
We study the form factors of baryons, focusing on the N(1520)3/2-, using a Contact Interaction model. This model addresses bound states of quarks and antiquarks in mesons, diquark formation, and finally baryons in a quark-diquark framework. We analyze diagrams between quark-diquark and photons, following the rules of the Faddeev kernel. Although the model has limitations, its algebraic simplicity provides valuable insights that can guide more advanced studies in quantum chromodynamics.

See you on Monday.
Best regards,
Caroline, Joe, Zheng-Yang & Gloria


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