Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Hadron Structure and Spectroscopy VIII

HK 45.2: Talk

Thursday, March 1, 2018, 14:30–14:45, HZO 50

Soft-photon corrections to the Bethe-Heitler process in the γ p→ l⁺l⁻p reaction — •Matthias Heller — Johannes-Gutenberg Universität Mainz

High-precision calculations of electromagnetic processes become more and more important for the interpretation of electron-nucleon scattering experiments. One example is the Bethe-Heitler process, the lepton pair photoproduction on a proton target, which can be used as a test of lepton universality. Violation of this universality could shed light on the proton radius puzzle, the discrepancy between the charge radii measurements from muonic spectroscopy and data with electrons. An upcoming experiment at MAMI (Mainz) aims to compare the cross-sections of muon and electron pair production. A precise knowledge of the electromagnetic radiative corrections is needed for these measurements. As a first step, the leading QED radiative corrections are presented in the soft-photon approximation.