报告题目：Probing the Nucleon Structure with Lepton Scattering
报告人: 彭潮 Argonne National Laboratory
报告地点：理科楼C302报告厅/ 腾讯会议ID：641 300 351
Quantum Chromodynamics (QCD), the fundamental theory of strong interaction in terms of quarks and gluons, has achieved great success from experimental tests at high energies, where perturbative calculations can be carried out. However, many essential questions regarding the confinement of quarks and gluons remain in the non-perturbative region. The nucleon can be viewed as a natural test lab with confined quarks and gluons, and thus the knowledge about its internal structure is critical to understand low energy QCD. In this talk, I will present details of two experiments, E97-010 (Hall A, Jefferson Lab) and PRad (Hall B, Jefferson Lab), that study the nucleon structure with inclusive measurements of electron scattering. E97-110 measures the asymmetries from longitudinally-polarized electrons scattering off a longitudinally or transversely polarized Helium-3 gas target. It tests predictions of Chiral Effective Field Theory regarding the neutron spin structure through various sum rules. PRad Experiment aims to resolve the “proton radius puzzle” by extracting the proton charge radius from a high precision inclusive measurement of unpolarized electron-proton scattering. Future lepton scattering experiments will also be discussed.
Chao Peng, Argonne National Laboratory, Assistant Physicist – Experimentalist
Chao is an experimental physicist in the Physics Division, Argonne National Laboratory. His research focuses on the nucleon internal structure and the emergence of its global properties, including but not limited to the charge radius, spin, and mass. His research programs aim to deepen our knowledge of the nucleon and to understand its internal structure with the quark-gluon degrees of freedom. As an experimentalist, Chao started his career with the PRad and E97-110 experiments at Jefferson Lab. He is currently focusing on various electron scattering experiments at Hall B and Hall C, Jefferson Lab. He is also preparing for the future experiments in the upcoming SoLID program and electron-ion collider (EIC). He obtained his B.S. degree in Engineering Physics from Tsinghua University in 2009, and Ph.D. degree in Physics from Duke University in 2018.
