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[2025年5月29日] 刘潇屿-——Probing QCD collectivity at the smallest scale through high multiplicity jets in pp collisions at CMS

2025-05-26 09:13:00 来源:华南师范大学量子物质研究院 点击:37 收藏本文

报告题目:Probing QCD collectivity at the smallest scale through high multiplicity jets in pp collisions at CMS 


报告人:刘潇屿 Postdoctoral Associate (莱斯大学)


报告时间:2025年5月29日 下午2:00-3:30


报告地点:理8栋118报告厅  


报告摘要

Recent CMS data have revealed long-range correlations at high in-jet charged particle multiplicity () within jets produced in proton-proton (pp) collisions, suggesting collective behavior in systems much smaller than those typical of heavy ion collisions. In the polar coordinate system about the reconstructed jet axis, two-particle azimuthal correlations show an unexpected rise in elliptic anisotropy () at large pseudorapidity separations () as a function of , a trend not reproduced by event generators like PYTHIA or SHERPA. In this seminar, I will present detailed measurements of long-range correlations using LHC Run 2 data at  TeV and compare the results with model predictions. The transverse momentum and  dependence of  is showed across a wide range in . Furthermore, the role of jet substructure, particularly in jets exhibiting two-prong features, is examined to unveil a potential connection between the  enhancement and the initial-state jet geometry. A surprising increase in  emerges exclusively in those two-prong jets at high .

 

 报告人简介

刘潇屿,莱斯大学(Rice University)博士后研究员。2017年本科毕业于华中师范大学,2023博士毕业于俄亥俄州立大学(The Ohio State University)。博士期间主要参与RHIC-STAR实验,研究内容包括利用Event Plan Detector (EPD) 在大赝快区域测量directed flow,以及在RHIC BES-II能区研究flow decorrelation现象。2024年起加入LHC-CMS实验,研究兴趣包括喷注中的集体行为和CMS二期升级相关课题。