The anomalous magnetic moment of the muon -- a window to physics beyond the Standard Model

by Prof. Zhiqing Zhang (IJCLab (former LAL), France)

Thursday 27 May 2021, 15:30 → 17:00 Asia/Shanghai

CHEP

The anomalous magnetic moment of the muon (a_\mu) plays a special role in the establishment of the Standard Model (SM). After a brief introduction to the history of the anomalous magnetic moment of the electron and muon including the latest measurement results, I shall focus on describing the theoretical prediction in particular the hadronic contribution to a_\mu which is the dominant uncertainty source of the theoretical prediction. The comparison of the measurement and the prediction gives currently a discrepancy of 4.2 standard deviations, which could be a first hint of new physics beyond the SM. The coming few years will be exciting as the measurement uncertainty will be reduced by a factor of four. Biography: Zhiqing Zhang graduated from Peking University in 1984 and did his study of master and PhD under the supervision of Prof. Dandi Wu and Prof. Tao Huang, respectively, in the theory division of IHEP. In 1989, he visited LAL and continued his PhD study there on ALEPH under the supervision of Prof. Michel Davier, resolving a longstanding one-prong problem in the tau lepton decays by performing a complete measurement of all its decay modes. After his PhD thesis in 1992, he became a permanent researcher in the French National Center for Scientific Research (CNRS). Over the last thirty years, He has worked in several large international experiments or projects such as ALEPH at LEP, H1 at HERA, CALICE on ILC, and ATLAS at the LHC. In parallel, he has been a member of the DHMZ (Davier-Hoecker-Malaescu-Zhang) group since 20 years providing a theoretical prediction for the anomalous magnetic moment of the muon which has been used as a reference to compare with the direct measurements previously from BNL and recently from Fermilab. He has supervised a number of PhD students and postdocs from China and has been an invited member in a few projects in China. Currently he is the head of the ATLAS group at IJCLab (former LAL), and a deputy spokesperson of the H1 Collaboration. Zoom： https://zoom.com.cn/j/96357968034?pwd=K2REeGF0V2dqOElRd09hVGVRcDk4Zz09 or https://cern.zoom.us/j/96357968034?pwd=K2REeGF0V2dqOElRd09hVGVRcDk4Zz09 Meeting ID: 963 5796 8034 Password: 125125

Slides Zhang_amu_210527.pdf