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Volume 352 - XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2019) - Working Group 7: Future of DIS
Measuring the Proton Radius in High-Energy Muon-Proton Scattering
C. Dreisbach,* J. Friedrich, M. Hoffmann, A. Inglessi, E. Kabuß, B. Ketzer, O. Kiselev, E. Maev, S. Paul, G. Petrov, S. Uhl, A.A. Vasilyev, B.M. Veit, A.A. Vorobyov, C.a.W. Group
*corresponding author
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Pre-published on: 2019 July 13
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The proton charge radius can be determined by measuring the slope of the electric form-factor $G_E$ at small four-momentum transfer squared $Q^2$. Numerous 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 contribute to the resolution of the puzzle, especially due to the different systematic effects of this approach compared to those of electron-proton scattering. In 2018, we performed a test measurement with silicon tracking detectors up- and downstream of a prototype TPC to study the feasibility of the measurement concept. We present initial results of the on-going analysis of the test data and discuss ideas for a possible experiment at CERN in 2022.
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