学术活动

西南理论物理中心系列报告:Parton distributions for the LHC precision era

作者:点击次数:更新时间:2024年01月22日

报告题目: Parton distributions for the LHC precision era

报 告 人: 谢可平,密歇根州立大学

邀 请 人 :周思益

时 间: 2024年1月15号(星期一)14:00

地 点: 腾讯会议 890-521-841 和 纽约国际手机登录LE201

Abstract: The parton distribution functions (PDFs), defined the probability densities for finding a parton (quark or gluon) within a nucleon, are essential for the current and future hadron colliders, such as LHC and FCC-hh/SppC. In modern times, PDFs are extracted with a global analysis of hadronic data, including deep inelastic scattering (DIS), fixed-target and collider experiments. In this talk, I will first review the latest progress of the global analyses of PDFs and its applications for the ongoing LHC Run III as well as the future HL-LHC. Meanwhile, with the accumulation of the LHC data and a lack of direct signals for new physics, we are have entered its precision era. The PDF uncertainty, nowadays, becomes a bottleneck for us to understand many precision measurements, such as the latest MW anomaly at CDF-II. I will discuss the challenges to fit the LHC precision data as well as potential solutions towards the future.

Brief CV:

Keping Xie is a postdoc at Michigan State University. Before that, he did his first postdoc at the University of Pittsburgh. He obtained his Ph.D. degree at Southern Methodist University in 2019 and Bachelor's degree at Peking University in 2014. He mainly works on parton distribution functions. As a member of the CTEQ-TEA (CT) collaboration, he was one of the major contributors to the latest CT18 PDFs. He led the QED corrections to the CT18 PDFs, i.e., CT18QED. Recently, he is dedicated to the electroweak (EW) factorization, involving both PDFs for initial-state radiations and fragmentation functions/parton shower for final-state ones. His work also covers high-order calculations, heavy flavors, neutrinos, Higgs bosons beyond the Standard Model, and effective field theory.