第五十四届HAPOF论坛，Probe Fundamental Physics via the η and η′ Decays，淦丽萍 教授，2022年07月22日

Friday 22 Jul 2022, 10:00 → 12:00 Asia/Shanghai

报告人：淦丽萍 教授 (University of North Carolina Wilmington)
报告时间：2022年07月22日 10：00 - 11：30 (Beijing time)

摘要：
The confinement nature of Quantum Chromodynamics (QCD) and the new physics Beyond the Standard
Model (BSM) are two frontiers in contemporary science. The system of η and η′ offers a rich
laboratory to explore both fundamental issues. The symmetries of QCD at low energies are 
manifested in the most unambiguous form in η and η′. Precision measurements of their properties
will yield light on our understanding of the QCD symmetry structure, as well as the origin and
dynamics of the confinement. In addition, the η(′) meson has quantum numbers of vacuum (except
parity) with its strong and electromagnetic decays being either anomalous or forbidden to the
lowest order due to symmetries or angular momentum conservation. This enhances the relative 
importance of higher order contributions, making the rare η(′) decays a sensitive hadronic 
probe for weakly-coupled new forces. Searching for sub-GeV dark gauge bosons, and C-violating,
P-conserving interactions in various η(′)decays will extend our knowledge of the dark sector 
and explore new sources of CP violation that is needed to explain the observed matter and 
anti-matter asymmetry in the universe. This talk will give an overview of the current status 
and the future experimental opportunities in the η(′) physics.

报告人简介：
Prof. Liping Gan is a full professor at University of North Carolina Wilmington, NC, USA. She
received Ph.D. in University of Manitoba, Canada, and M.S. and B.S. in Peking University, 
China. Her researches focus on the confinement QCD and new physics beyond the standard model 
via precision measurement of the light meson decays. Prof. Gan is a leader and a spokesperson
for three experiments at Jefferson Lab: (1) the PrimEx-IIexperiment in Hall B (E-08-023), 
carried out the most precise measurement of the π0 lifetime published up to date; (2) the 
PrimEx-eta experiment, a measurement of the η radiative decay width in Hall D (E-10-011); 
(3) the JLab Eta factory (JEF) experiment (E12-12-002A), a study of η/η′ decays with emphasis
on rare modes in Hall D.

eta-physics.pdf eta-physics.pptx HAPOF54th-LiPing-Gan-eta-decays.mp4 poster54.png