| Issue |
EPJ Web Conf.
Volume 303, 2024
The 16th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2023)
|
|
|---|---|---|
| Article Number | 05008 | |
| Number of page(s) | 4 | |
| Section | Fundamental Symmetries / New Physics Searches | |
| DOI | https://doi.org/10.1051/epjconf/202430305008 | |
| Published online | 25 September 2024 | |
https://doi.org/10.1051/epjconf/202430305008
R Measurement at BESIII
Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
* e-mail: redmer@uni-mainz.de
Published online: 25 September 2024
The R value is measured with a total of 14 data points with the corresponding center-of-mass energy going from 2.2324 to 3.6710 GeV. The statistical uncertainty of the measured R is less than 0.6%. Two different simulation models, the LUARLW and a new Hybrid generator, are used and give consistent detection and initial-state radiation corrections. An accuracy of better than 2.6% below 3.1 GeV and 3.0% above is achieved for the R value. The precise measurement will be an important constraint for precision tests of the Standard Model, such as calculations of the anomalous magnetic moment of the moun and the running of the QED coupling.
© The Authors, published by EDP Sciences, 2024
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