Exploring the Flavor Structure of Nucleon Sea with Lepton-Pair Production
by
Prof.Jen-Chieh Peng
(University of Illinois at Urbana-Champaign)
→
Asia/Shanghai
IHEP main building
IHEP main building
Description
ABSTRACT:
Direct experimental evidence for point-like constituents in the nucleons was first found in the electron deep inelastic scattering (DIS) experiment. The discovery of the valence and sea quark structures in the nucleons inspired the formulation of Quantum Chromodynamics (QCD) as the gauge field theory governing the strong interaction. A surprisingly large asymmetry between the up and down sea quark distributions in the nucleon was observed in DIS and the lepton-pair production experiments. In this talk, I discuss the current status of our knowledge on the flavor structure of the nucleon sea.
I will also discuss the progress in identifying the "intrinsic" sea components in the nucleons and in understanding the mechanism of the dilepton production at the LHC. Recent results from the Fermilab SeaQuest experiment to extend the measurement of sea-quark flavor structure to large-x region will be presented. Prospect for future studies on nucleon sea will also be discussed.
About the speaker:
Professor Peng made pioneering contributions to several areas of medium energy physics. He was the first to recognize the feasibility of producing η mesons at the Los Alamos Meson Physics Facility (LAMPF) and made the first (π,η) measurements on nuclei. In the early 1980s, Professor Peng proposed the (π+,K+) measurements at Brookhaven National Laboratory's Alternating Gradient Synchrotron (AGS) accelerator, which ultimately identified single-particle states of lambda hypernuclei. Since the late 1980s, Professor Peng has made seminal contributions to high-energy nuclear physics in a series of experiments at Fermilab (E772, E789, and E906), which pioneered the use of massive lepton pair production to probe the distributions of antiquarks in the nucleons and nuclei. Professor Peng was the spokesperson or co-spokesperson for ten experiments carried out at various laboratories.
Zoom Link: https://ihep-ac-cn.zoom.com.cn/j/83213017738?pwd=SUlFSm4vb2NqdWhySmpjYXE5cWpBZz09
Zoon ID: 83213017738
Passed: 210430