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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Hadron Structure and Spectroscopy VIII
HK 58.4: Vortrag
Mittwoch, 13. März 2024, 18:30–18:45, HBR 62: EG 19
Measurement of the two photon production of the f1(1285) in e+e− scattering at BESIII — •Jan Muskalla, Achim Denig, and Christoph Florian Redmer for the BESIII collaboration — Johannes-Gutenberg Universität Mainz, Institut für Kernphysik
The anomalous magnetic moment of the muon aµ is one of the most precisely measured observables of the Standard Model (SM). Nonetheless, a discrepancy of 5.1σ is observed between SM prediction and experiment. The uncertainties of the SM prediction are currently dominated by hadronic contributions. In particular, axial vector contributions to the hadronic light-by-light (HLbL) scattering need higher precision transition form factor (TFF) measurements as experimental input to theory predictions. The BESIII experiment at the Beijing Electron Positron Collider (BEPCII) is collecting data in the τ-charm energy region and offers large datasets perfectly suited for the study of two-photon interactions. With a data set of up to 40 fb−1 in the energy range √s=(3.77 − 4.6) GeV, the reaction e+e−→ e+e− f1(1285) is investigated in a single tag configuration to evaluate the momentum dependence of the TFF. This talk will present the current status of the analysis.
Keywords: BESIII; g-2; HLbL; TFF; Meson