Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Hadron Structure and Spectroscopy VI

HK 23.1: Gruppenbericht

Mittwoch, 1. April 2020, 14:00–14:30, J-HS M

Study of neutral pion-pair production in two-photon scattering at BESIII — •Max Lellmann and Achim Denig for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz

The anomalous magnetic moment of the muon aµ is one of the most precisely measured observables of the Standard Model, yet it shows a discrepancy of 3-4σ between Standard Model prediction and direct measurement. It is still under discussion whether this discrepancy is a hint for New Physics or caused by the limited understanding of the strong interaction at small energies.

Information on the production of pion pairs in two-photon fusion processes plays an important role in the calculation of the hadronic light-by-light scattering contribution to aµ.

The BESIII experiment, a τ-charm-factory located at the institute of high energy physics in Beijing, China, offers a perfect testbed for the investigation of two-photon processes at small momentum transfers. The processes γγ→π0π0 and γγ*→π0π0 are investigated in the channel e+ee+e+π0π0 using the BESIII experiment. This presentation will discuss the current status of the analysis.

Supported by DFG (SFB1044)

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