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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Hadron Structure and Spectroscopy II

HK 10.2: Gruppenbericht

Dienstag, 31. August 2021, 14:30–15:00, H3

Experimental Inputs to the Hadronic Vacuum Polarization Contribution to the Anomalous Magnetic Moment of the Muon at the BESIII Experiment — •Riccardo Aliberti — JGU Mainz

The recent result from the Muon g−2 Experiment has confirmed the tension between the Standard Model (SM) prediction of the anomalous magnetic moment of the muon (a_µ) and the experimental measurement at a 4.2 σ level. To understand the origin of this discrepancy further improvements of experiment and theory are necessary.
The uncertainty on the SM prediction is dominated by hadronic contributions and particularly by the Hadronic Vacuum Polarization (HVP) component, which is evaluated with a dispersive formalism from the measurement of hadron production cross sections in electron-positron annihilations. Therefore, improvements in the cross section measurements directly reflect in a reduction of the uncertainty on the HVP contribution to a_µ
The BESIII Experiment, located at the BEPCII collider in Beijing, has collected the world largest dataset of e⁺e⁻-annihilations in the τ-charm energy region. In this talk, the current status and perspective for the measurement of hadron production cross sections, entering the evaluation of the HVP contribution to a_µ, at BESIII are reviewed. The author of this talk is supported by DFG.