Hadron Ion Tea (HIT) Seminar Series

[formerly the Heavy Ion Tea Seminars]

Nuclear Science Division

Lawrence Berkeley National Laboratory

HIT seminars are on Tuesdays and Thursdays at 3:30pm Pacific Time   (unless otherwise noted)

Organizers: Shujie Li, Dimitra Pefkou, Nu Xu, & Wenbin Zhao

HIT zoom link 

Previous seminars can be viewed on our HIT Youtube Channel

Upcoming seminars

Welcome to our Hadron-Ion Tea Seminar Series in 2024!  All talks are available on zoom, some are in-person as well - we hope you join us!

Tuesday, May 28th, 3:30PM (in-person and on zoom)

Meijian Li (Santiago de Compostela Univeersity)

Host: Xin-Nian Wang

"Scattering and gluon emission of a dressed quark in colored field"

Following the non-perturbative light-front Hamiltonian formalism developed in the preceding works [Phys. Rev. D 104, 056014 (2021), Phys. Rev. D 108, 036016 (2023)], we investigate the scattering and gluon emission of dressed quark states inside a SU(3) colored background field. We consider the scenario in deep inelastic scattering and in heavy ion collisions, where the quark originates from far outside the background field and is described by the light-front wavefunction of the QCD eigenstate in the |q>+|qg> Fock space. We perform numerical simulations of the real-time quantum state evolution of an initially dressed quark state at various energy and medium configurations. With the obtained light-front wavefunction of the evolved state, we extract the quark jet transverse momentum distribution, the cross section, and the gluon emission rate. This investigation provides a novel systematic description of the quark scattering process inside colored medium using a non-perturbative formalism.

Thursday, May 30th, 10:00 AM (in-person and on zoom)

Xin Dong (LBNL)

Host: Nu Xu

"Precision Measurements of Net-proton Number Fluctuations in Au+Au Collisions at RHIC"

   The main goal of the RHIC beam energy scan program (BES) is to study the strongly interacting nuclear matter phase structure and search for the possible QCD critical point in high-energy nuclear collisions.  Over more than a decade, the scan (BES-I and BES-II) covered a wide range of collision energy, from √(s_NN )=3.0GeV to 200GeV corresponding to a wide range of baryonic-chemical potential μ_B = 750 MeV to 25 MeV. The STAR detector, with some crucial upgrades, was the main apparatus used in the scan. Observables, for studying the physics of collectivity, Chirality, criticality, including light/strange hadrons, leptons, correlations, (hyper-)nuclei have been measured with the highest precision to date.  

    In this talk, we will focus on the physics of phase boundary and QCD critical point. New BES-II data on collision energy and centrality dependence of proton, anti-proton and net-proton cumulants, up to the 4th order, in Au+Au collisions at √(s_NN ) = 7.7, 9.2, 11.5, 14.6, 17.3, 19.6 and 27 GeV, will be presented. The new experimental results will be discussed within the framework of non-critical model calculations. Finally, I will highlight a few other key measurements on baryon correlation and dynamics from BES-II towards the understanding of QCD phase structure at high density region.

Tuesday, June 18th, 3:30PM (on zoom)

Chun Shen (Wayne State University)

Host: Wenbin Zhao

Title and abstract coming soon!