SMuK 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 48: Hadron Structure and Spectroscopy V

HK 48.5: Vortrag

Mittwoch, 22. März 2023, 18:30–18:45, SCH/A316

Study of η and η′ Production in Double-Tagged Two-Photon Scattering — •Maurice Anderson, Achim Denig, Christoph Florian Redmer, and Max Lellmann for the BESIII collaboration — JGU Mainz

The g-2 puzzle describes a 4.2 σ discrepancy between the experimental measurements of the muon’s magnetic moment and the Standard Model prediction. In order to determine whether this observed deviation is a significant discovery of possible Beyond the Standard Model physics, the measurement uncertainty must be reduced. The primary source of systematic error stems from the hadronic quantum fluctuations affecting the muon, specifically the hadronic vacuum polarization (HVP) and the hadronic light-by-light (HLbL) scattering contributions. The HLbL term is dominated by the exchange of pseudoscalar mesons.

In this talk, the production of η and η^′ mesons via two virtual space-like photons will be studied. Double-tagged measurements are conducted at the BESIII experiment in Beijing, China, in which both virtual photons possess nonzero momentum transfers (Q²). The transition form factor needed for the calculation of the HLbL contribution is determined in dependence of both Q²-values.