Christian Dreisbach, "Proton Radius Measurement in High-Energy Muon Scattering at COMPASS++/AMBER"

Thursday 31 Oct 2019, 09:30 → 11:30 Europe/Berlin

3268 (TUM Physik Department I)

The proton charge radius can be determined by measuring the slope of the
electric form-factor G E at small four-momentum transfer squared Q 2 . Numer-
ous elastic-scattering and laser-spectroscopy measurements of the proton radius
have been performed with contradicting results, often referred to as the proton-
radius puzzle. We propose to measure the proton charge radius in high-energy
elastic muon-proton scattering at the M2 beam line of CERN’s Super Proton
Synchrotron (SPS) in 2022. A high-precision measurement at low Q 2 , performed
with a high-pressure hydrogen-filled time-projection chamber (TPC), can con-
tribute to the resolution of the puzzle, especially due to the different systematic
effects of this approach compared to those of electron-proton scattering. We
present initial results of the on-going Monte Carlo simulations and discuss ideas
for a possible experiment at CERN in 2022.