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 48.6: Vortrag
Mittwoch, 22. März 2023, 18:45–19:00, SCH/A316
Study of neutral-pion pair production in two-photon scattering at BESIII — •Max Lellmann, Achim Denig, and Christoph Florian Redmer — Johannes Gutenberg-Universität Mainz
The anomalous magnetic moment of the muon, aµ, is one of the most precisely measured observables of the Standard Model, yet it shows a discrepancy of about 4.2σ between Standard Model prediction and measurement. It is still under discussion whether this discrepancy is a hint for New Physics or a proof for the poor understanding of strong interaction at low energies. To get a better understanding of this discrepancy, one needs to reduce the uncertainty of both, the Standard Model prediction and the direct measurement. Since the uncertainty of the Standard model prediction is dominated by hadronic contributions, it is crucial to gather more information about the contributing hadronic processes.
Information on the production of pion pairs in two-photon fusion processes plays an important role in the calculation of the hadronic light-by-light scattering contribution to aµ. The BESIII experiment, located at the institute of high energy physics in Beijing/China, offers a perfect testbed for the investigation of two-photon processes at small momentum transfers. The process e+e−→ e+e−π0π0 is measured at the BESIII experiment at centre-of-mass energies between 3.77 and 4.6 GeV with a total integrated luminosity of more than 10 fb−1. This presentation will discuss the current status of the analysis.