Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Hadron Structure and Spectroscopy IV

HK 22.1: Group Report

Tuesday, February 27, 2018, 16:30–17:00, HZO 50

Measurement of hadronic cross sections at BESIII using Initial State Radiation — •Christoph Florian Redmer and Achim Denig for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland

The anomalous magnetic moment of the muon a_µ=(g_µ−2)/2 is one of the most precisely determined observables in the Standard Model. Despite the achieved precision of 0.54 ppm, there remains a discrepancy of more than three standard deviations between the Standard Model prediction and the direct measurement. The uncertainties of the Standard Model prediction are currently completely dominated by hadronic contributions, where the largest comes from the hadronic vacuum polarization. Hadronic cross sections measured at e⁺e⁻ colliders can be used as experimental input to improve the calculations, making use of the optical theorem. At the BESIII experiment in Beijing these cross sections are determined using the method of Initial State Radiation. This presentation will give an overview of the recent results and the current status of the analyses.

Supported by DFG (SFB 1044).