Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Hadron Structure and Spectroscopy IX
HK 52.5: Talk
Wednesday, March 30, 2022, 17:00–17:15, HK-H8
Analysis of data from a pilot run to measure the proton charge radius at AMBER — •Martin Hoffmann for the AMBER collaboration — Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany
The proton charge radius can be determined either by measuring the slope of the electric form factor via elastic lepton-proton scattering at low squared four-momenta Q2 or by laser spectroscopy of hydrogen. Previous measurements of elastic electron-proton scattering as well as laser-spectroscopy of muonic and ordinary hydrogen yielded contradicting results. The AMBER collaboration plans to conduct a precision measurement of the proton electric form factor using high-energy muon-proton elastic scattering. This complementary approach avoids many of the systematic uncertainties of low-energy electron-proton elastic scattering.
The recoil proton is going to be detected in a high-pressure hydrogen time projection chamber (TPC), measuring the transferred momentum. The muon kinematics will be measured with silicon tracking detectors surrounding the TPC and parts of the upgraded COMPASS spectrometer. In 2021, a pilot run was performed in order to study key parts of the full setup under realistic beam conditions.
This contribution presents preliminary results of the pilot run analysis and on-going Monte Carlo simulations.
Supported by EU.