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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Hadron Structure and Spectroscopy VIII

HK 45.1: Gruppenbericht

Donnerstag, 1. März 2018, 14:00–14:30, HZO 50

Measurement of electromagnetic transition from factors in two-photon collisions at BESIII — Achim Denig, •Brice Garillon, Yuping Guo, and Christoph Florian Redmer for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz

Electromagnetic Transition Form Factors (TFFs) of light mesons provide valuable information on the nature of the strong interaction. At large momentum transfer Q², they shed light on mesons’ structure. At small momentum transfer, the TFFs are important inputs to the calculation of the hadronic ligh-by-light scattering contribution to the Standard Model prediction of the anomalous magnetic moment of the muon (g−2)_µ. The BESIII experiment at the e⁺e⁻ collider BEPCII has collected more than 10 fb⁻¹ at center-of-mass energies between 2.0 and 4.6 GeV. The data sets are analyzed for two-photon collisions in events of the type e⁺e⁻ → e⁺e⁻P, with P=π⁰, η^(′), π⁰π⁰ and π⁺π⁻. The aim is to study the momentum transfer dependence of the respective electromagnetic TFFs in the space-like region relevant for the calculation of (g−2)_µ. In this talk the current status and the prospects of the ongoing analyses will be presented.