| Issue |
EPJ Web Conf.
Volume 218, 2019
The 11th International Workshop on e+e− Collisions from Phi to Psi (PhiPsi 2017)
|
|
|---|---|---|
| Article Number | 02009 | |
| Number of page(s) | 6 | |
| Section | Hadronic Cross Section Measurements in e+e− Annihilations | |
| DOI | https://doi.org/10.1051/epjconf/201921802009 | |
| Published online | 18 October 2019 | |
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
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