Date: March 9th, 2023

Speaker: Ching Him (Hugo) Leung

Host: Zein-Eddine Meziane

Title: Probing Antiquark and Gluon Distribution of Nucleon at SeaQuest

Abstract:

SeaQuest has measured dimuon events from the interaction of 120 GeV proton beam on liquid hydrogen and deuterium targets with dimuon mass between 2 and 8 GeV. These dimuon events contain both the Drell-Yan process and the charmonium (J/ψ and ψ′) production. The first result of the Drell-Yan (p+d)/2(p+p) cross section ratio, based on the analysis of a fraction of the collected data, has provided new information on the light sea quark asymmetry. While the Drell-Yan process which probes the antiquark distributions in the nucleons, the charmonium production is sensitive to both quark and gluon distributions. Results of the charmonium analysis will also be discussed. Future prospects for studying the flavor structure of the nucleon sea and on the charmonium production will also be discussed.