Volume 479 - The 11th International Workshop on Chiral Dynamics (CD2024) - Working Group 1 parallel session: Goldstone-Boson Dynamics
R value measurements at BESIII
F. Stieler
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Abstract
The $R$ value is defined as the ratio of the leading-order cross-section of hadron muon pair production in electron-positron annihilation. It is crucial for the precise determination of several quantities in the Standard Model (SM), including the QED running coupling constant evaluated at the Z-boson pole and the muon magnetic moment ($a_\mu$), where the current uncertainties are dominated by hadronic vacuum polarization, that cannot be calculated using perturbative theory at low energy regions. This paper presents a discussion of the current status of $R$ measurements at BESIII based on $e^+e^-$ annihilations detected at the BESIII detector within an energy range of 2.23 to 3.67 GeV.
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