München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Hadron Structure and Spectroscopy IV
HK 25.5: Talk
Tuesday, March 19, 2019, 17:45–18:00, HS 13
Investigations of muon-proton elastic scattering to measure the proton charge radius — •Martin Hoffmann1, Christian Dreisbach2, Jan Friedrich2, Alexander Inglessi3, Eva Kabuss4, Bernhard Ketzer1, Oleg Kiselev5, Evgeny Maev3, Stephan Paul2, Sebastian Uhl2, and Benjamin Veit5 for the COMPASS collaboration — 1Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany — 2Technische Universität München, Physik-Department, Garching, Germany — 3Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia — 4Universität Mainz, Institut für Kernphysik, Mainz, Germany — 5GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
The proton radius puzzle is an exciting problem in particle physics. To help solving it, the COMPASS collaboration plans to conduct a measurement of the proton electric form factor at very small values of the squared momentum transfer using high-energy muons scattered in a high-pressure hydrogen TPC (Time Projection Chamber). In the year 2018 a first proof-of-principle experiment was performed at the COMPASS beam line using a prototype TPC and eight double-sided silicon detectors. The talk will focus on the analysis of the TPC data and of the combined data of both detector systems. Correlations between parameters measured in the TPC and in the tracking system will be discussed. The resolutions achieved with the present setup will be presented. They will be used together with ongoing Monte-Carlo studies to define the final setup for the measurement.
Supported by BMBF.