München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Hadron Structure and Spectroscopy IV
HK 25.4: Talk
Tuesday, March 19, 2019, 17:30–17:45, HS 13
Proton Radius in High-Energy Muon Scattering — •Christian Dreisbach1, Jan Friedrich1, Martin Hoffmann2, Alexander Inglessi3, Eva Kabuss4, Bernhard Ketzer2, Oleg Kiselev6, Evgeny Maev3, Stephan Paul1, Sebastian Uhl1, Benjamin Veit5,6, and the COMPASS Collaboration5 — 1Technische Universität München, Physik-Department, Garching, Germany — 2Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany — 3Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia — 4Universität Mainz, Institut für Kernphysik, Mainz, Germany — 5CERN, 1211 Geneva 23, Switzerland — 6GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
The proton radius can be determined by measuring the slope of the electric form factor GE at small squared four-momentum transfer Q2. Numerous elastic-scattering and laser-spectroscopy measurements of the proton radius have been performed with contradicting results, the so-called proton radius puzzle. We propose to measure the proton radius in high-energy elastic muon-proton scattering at the M2 beam line of CERN*s Super Proton Synchrotron in the year 2022. A high-precision measurement at low Q2 realized with a high-pressure hydrogen TPC can contribute to a solution of the puzzle, especially in view of the systematics of this approach compared to electron scattering. In the year 2018, a test measurement with silicon tracking detectors upstream and downstream of a prototype TPC was performed to study the feasibility employing both detector systems. We present results of the on-going analysis and discuss ideas for a possible setup in 2022.