Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Hadron Structure and Spectroscopy VII

HK 57.2: Gruppenbericht

Freitag, 31. März 2017, 14:30–15:00, F 5

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

Electromagnetic transition form factors of light pseudoscalar mesons are important inputs to the calculations of the hadronic light-by-light scattering contribution to the Standard Model prediction of the anomalous magnetic moment of the muon. Data at the relevant regions of momentum transfer are scarce. The BESIII experiment at the e⁺e⁻ collider BEPCII has collected more than 10 fb⁻¹ of data at center-of-mass energies between 2.0 and 4.6 GeV/c². 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 dependence of the respective electromagnetic transition form factors in the space-like regime. In this presentation we discuss the current status and the prospects of the ongoing analyses.