Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Hadron Structure and Spectroscopy II
HK 10.4: Vortrag
Montag, 28. März 2022, 15:15–15:30, HK-H9
Radiative corrections to elastic muon-proton scattering — •Norbert Kaiser1, Yonghui Lin2, and Ulf-G. Meißner2 — 1Physik Department T39, Technische Universität München — 2HISKP and Bethe Center for Theoretical Physics, Universität Bonn
In support of the upcoming AMBER experiment at CERN to measure the proton charge-radius, the radiative corrections to elastic muon-proton scattering µ±p→ µ±p are calculated, keeping the full dependence on the lepton mass. Besides vacuum polarization and the photon-loop form factors F1,2γ(t) of the muon, one has to consider the photon-loop around the proton. The corresponding electric and magnetic form factors GE,Mγ(t) consist of infrared-divergent and infrared-finite pieces that are evaluated by including proton structure through electromagnetic form factors (caused by the strong interaction) and the excitation to the Δ+(1232)-resonance. The same features apply to the computation of the two-photon exchange box-diagrams. It is found that after cancelation of infrared divergences the (soft) photon bremsstrahlung plays a prominent role among the radiative corrections. Therefore, the calculation of bremsstrahlung should be extended beyond the soft photon approximation and adapted to the specific experimental conditions.
This work has been supported in part by DFG (Project-ID 196253076 - TRR 110) and NSFC.