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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Hadron Structure and Spectroscopy VIII

HK 58.2: Talk

Wednesday, March 13, 2024, 18:00–18:15, HBR 62: EG 19

Double-Tagged Investigation of γ^*γ^*→η^′ at BESIII — •Maurice Anderson, Achim Denig, Christoph Florian Redmer, and Max Lellmann for the BESIII collaboration — JGU Mainz

In this presentation, the production of pseudoscalar η^′ mesons via two virtual spacelike photons is studied (γ^*γ^*→η^′). Double-tagged measurements are conducted at the BESIII experiment in Beijing, China, in which both virtual photons possess nonzero momentum transfers Q₁² and Q₂². The Monte Carlo generator Ekhara 3.0 is used to simulate the expected Q₁²,Q₂² distribution of the signal events. By measuring the double differential cross section at BESIII, the transition form factor (TFF) can be determined for Q₁²,Q₂²<2 GeV². The TFF of pseudoscalar mesons serves as essential input for calculating the hadronic light-by-light (HLbL) contribution to the theoretical Standard Model prediction of the anomalous magnetic moment of the muon a_µ= (g_µ− 2)/2.

Keywords: BESIII; HLbL; Meson; Transition Form Factor; Analysis