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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Hadron Structure and Spectroscopy I

HK 2.3: Vortrag

Montag, 16. März 2026, 17:15–17:30, PHIL C 301

The PRIMA Experiment@MAMI: Simulation work for the pion acceptance determination — •Òscar Andújar Sabán¹, Ning Cao¹, Luigi Capozza¹, Jonas Geisbüsch¹, Ravi Gowdru Majunata¹, Frank Maas^1,2,3, Antoine Martinet¹, Oliver Noll^1,2, Paul Schöner¹, Christoph Rosner¹, Pierre Vijayan¹, and Sahra Wolff¹ for the PANDA collaboration — ¹Helmholtz-Institut Mainz, Mainz, German — ²Institute of Nuclear Physics, Mainz, Germany — ³PRISMA+ Cluster of Excellence, Mainz, Germany

The significant discrepancy among data-driven models for the pion electromagnetic transition form factor (TFF)F_{π⁰γ^*γ^*} must be resolved, as this factor provides a main contribution to the hadronic light-by-light scattering (HLbL) process, which is essential for calculating the hadronic correction to the muon anomalous magnetic moment (a_µ^QCD). The PRIMA Experiment is measuring F_{π⁰γ^*γ^*} in the low momentum transfer (Q²) region at the MAMI accelerator in Mainz, utilizing an Electromagnetic Calorimeter (EMC) and an Electron Veto Detector.
Determining the pion acceptance of the calorimeter is essential for this experiment. Consequently, simulation studies are being performed. This talk presents the current work-in-progress and the initial results regarding the pion acceptance.

Keywords: PRIMA; Pion Electromagnetic Transition Form Factor; MAMI