Speaker: Shu-yi Wei 魏树一(SDU)
Time: 14:30,Wednesday,December 3,2025
Location: Lecture Hall 9557

Abstract:

The transverse polarization of Λ hyperons within unpolarized jets is encoded in the transverse-momentum-dependent (TMD) fragmentation function . In the vacuum environment, the QCD evolution of this TMD fragmentation function is governed by the Collins-Soper equation. However, in the presence of the quark-gluon plasma (QGP) medium, the jet-medium interaction induces a transverse-momentum-broadening effect that modifies the QCD evolution. As a result, the transverse spin polarization of Λ hyperons in relativistic heavy-ion collisions differs from that in pp collisions. We demonstrate that this difference serves as a sensitive probe for studying jet-medium interaction, offering a novel perspective through the spin degree of freedom.

Introduction:

Dr. Shu-yi Wei (魏树一) is a physicist who got his Ph.D. in 2015 under the supervision of Prof. Zuo-tang Liang (Shandong University). He was a postdoc at IOPP, Central China Normal University (2015-2017), CPhT, Ecole Polytechnique (2017-2019) and ECT* (2019-2021). He is now a junior researcher at Shandong University at Qingdao, Shandong, China (2021-Now). His research interest includes: (1) CGC phenomenology; (2) hadron structure and hadronization; (3) QCD resummations; (4) jet quenching in relativistic heavy-ion collisions.