Hadron Ion Tea (HIT) Seminar Series
[formerly the Heavy Ion Tea Seminars]
Nuclear Science Division
Lawrence Berkeley National Laboratory
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HIT seminars are on Tuesdays at 4:00pm Pacific Time (unless otherwise noted)
HIT seminars are on Tuesdays at 4:00pm Pacific Time (unless otherwise noted)
Organizers: Yuxun Guo, Yuuka Kanakubo, Felipe Ortega, Mateusz Ploskon, Bigeng Wang and Zhenyu Ye (Contact us at hit-organizers@lbl.gov)
Previous seminars can be viewed on our HIT Youtube Channel
Upcoming seminars
Upcoming seminars
Welcome to our Hadron-Ion Tea Seminar Series in 2025! All talks are available on zoom, some are in-person as well - we hope you join us!
Nov. 25, 2025 (In person)
Dr. Raza Sabbir Sufian (New Mexico State U.)
Location: Swiatecki Lounge B70 annex - 228
Time: 4:00pm Pacific Time
ZOOM for those who are unable to come in-person: LINK
Host: Keh-Fei Liu
Title: Toward Calculating Gluon GPDs and the Hadronic Structure of the Photon from Lattice QCD
Abstract: Despite their central role in Quantum Chromodynamics (QCD) and in shaping the fundamental structure of the visible universe, the detailed dynamics of gluons remain among the most profound and unresolved questions in modern physics. We will discuss theoretical progress toward performing the first LQCD calculations of gluon generalized parton distributions (GPDs) of the pion and nucleon. The challenges in calculating gluon GPDs will be discussed. We will also discuss how lattice QCD calculations can unravel the nonperturbative hadronic structure of the photon and why this is important to understand fundamental aspects of QCD, and share our first attempt toward carrying out this calculation.
Dec. 09, 2025 (Remote)
Jonathan D. Kroth (Iowa State U.)
Location: Room 328, Birge Hall, UC Berkeley Campus MAP
Time: 4:00pm Pacific Time
ZOOM for those who are unable to come in-person: LINK
Host: Feng Yuan
Title: Searching for missing direct photons in heavy-ion collisions with P and CP violation
Abstract: The spectrum of direct photons from the quark-gluon plasma produced at RHIC has defied the efforts of theorists to describe it. In particular, a significant increase in the number of photons produced at low $p_T$ and the correct non-zero $v_2$ flow coefficient have yet to be predicted simultaneously. In an attempt to investigate possible solutions, we study synchrotron radiation from massive fermions in a medium with a chiral chemical potential and a chiral gradient parallel to the magnetic field. In the limit of a non-interacting plasma, these parameters increase the number of photons produced at low $p_T$ while suppressing the traditionally large synchrotron radiation flow coefficient $v_2$ to levels comparable to those seen in experiments. Given these results, we suggest that P- or CP-violating domains, long conjectured to exist in quark-gluon plasma and recently suggested by results from the STAR collaboration, may be a solution to the problem of missing direct photons.
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