https://doi.org/10.1051/epjconf/201921802009
Status of Measurement of R Value at BESIII
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
* e-mail: wenbiao@ustc.edu.cn
Published online: 18 October 2019
The R value is important for muon magnetic moment aµ and QED running coupling constant evaluated at Z pole, is useful to extract resonance parameters. BESIII experiment collected about 130 energy points between 2.0GeV and 4.6GeV for a precise measurement of R value. The status of R measurement at BESIII is reported in this paper.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
