# 第四十二届HAPOF论坛，Precision measurement of the R value at BESIII，王维平 博士，2022年02月25日

Asia/Shanghai
Description
报告人：王维平 博士 (中国科学技术大学)

The R value, defined as the ratio of lowest-order cross sections between the e+e- -> hadrons and the e+e- -> μ+μ- processes, is a very important quantity in particle physics. Precision measurements of the R ratio below 5 GeV contribute to the standard model prediction of the muon anomalous magnetic moment and the determination of the QED running coupling constant evaluated at the Z pole. In this talk, we report the measurement of the R value at BESIII, for which a plenty of efforts are made to control the corresponding uncertainty.

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