Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Hadron Structure and Spectroscopy VII
HK 42.1: Group Report
Wednesday, March 30, 2022, 14:00–14:30, HK-H8
Experimental Inputs to the Hadronic Vacuum Polarisation Contribution of the Anomalous Magnetic Moment of the Muon at the BESIII Experiment. — •Riccardo Aliberti for the BESIII collaboration — Johannes Gutenberg-Universität
The recent result from the Fermilab Muon g−2 Experiment has confirmed the tension between the standard model (SM) prediction of the anomalous magnetic moment of the muon (aµ) and the experimental measurement at a 4.2 σ level. Currently, the uncertainties on experimental and predicted values are very similar (41×10−10 and 43×10−10, respectively) and further improvement in both are to be expected in the next years.
The uncertainty on the SM prediction is dominated by hadronic contributions and particularly by the Hadronic Vacuum Polarisation (HVP) component, which is evaluated with a dispersive formalism from the measurement of hadron production cross sections in electron-positron annihilations.
The BESIII experiment, located at the BEPCII collider in Beijing, collects since 2008 data with center-of-mass energies between 2 and 5 GeV, resulting in the world’s largest dataset in 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 aµ, at BESIII are reviewed.