Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Hadron Structure and Spectroscopy I
HK 15.5: Vortrag
Dienstag, 11. März 2025, 15:15–15:30, HS 3 Physik
Study of neutral-pion pair production in two-photon scattering at BESII — •Max Lellmann, Achim Denig, and Christoph F. Redmer for the BESIII Germany collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz
The anomalous magnetic moment of the muon, aµ, is one of the most precisely measured observables in the Standard Model; however, a significant discrepancy exists between the Standard Model prediction and experimental measurements. Whether this discrepancy is indicative of new physics or stems from an incomplete understanding of the strong interaction at low energies remains an open question. To gain deeper insight into this discrepancy, it is necessary to reduce the uncertainties in both the Standard Model prediction and the direct measurements. Since the uncertainty in the Standard Model prediction is primarily driven by hadronic contributions, acquiring more detailed information on the relevant hadronic processes is crucial.
The production of pion pairs in two-photon fusion processes is vital for calculating the hadronic light-by-light scattering contribution to aµ. The BESIII experiment, located at the Institute of High Energy Physics in Beijing, China, provides an ideal platform for investigating two-photon processes at small momentum transfers. The process e+e−→ e+e−π0π0 is measured at BESIII for a center-of-mass energy of 3.77 GeV, with a total integrated luminosity exceeding 20 fb−1. This presentation will outline the current status of the analysis and the tools utilized.
Keywords: Two-Photon Physics; Anomalous Magnetic Moment of the Muon