München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Hadron Structure and Spectroscopy III
HK 18.5: Vortrag
Dienstag, 19. März 2019, 15:15–15:30, HS 13
Neutral pion-pair production in singly-virtual two-photon scattering at BESIII — •Max Lellmann, Achim Denig, and Christoph Florian Redmer for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz, Germany
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 about 3.7σ between Standard Model prediction and measurement. It is still under discussion whether this discrepancy is a hint for New Physics or a proof for the poor understanding of strong interaction at low energies.
Information on the production of pion pairs in two-photon fusion processes plays an important rule in the calculation of the hadronic light-by-light scattering contribution to aµ.
The BESIII experiment, 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 process e+e−→ e+e−γγ*→ e+e−π0π0 is measured at the BESIII experiment at centre-of-mass energies between 3.77 and 4.23 GeV with a total integrated luminosity of about 7 fb−1. This presentation will discuss the current status of the analysis.
Supported by DFG (SFB1044)