Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Hadron Structure and Spectroscopy II
HK 10.3: Vortrag
Montag, 28. März 2022, 15:00–15:15, HK-H9
Measurement of the Proton Radius in High-Energy Elastic Muon-Proton Scattering at AMBER — •Christian Dreisbach for the AMBER collaboration — Technische Universität München, Physik-Department, Garching, 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 2023. 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. The core setup consisting out of silicon tracking detectors up- and downstream of a prototype TPC is studied in a feasibility test measurement in the year 2018 and a pilot run in 2021 under comparable conditions as the proposed measurement. A beam test of a new unified tracking station utilizing scintillating fibers and monolithic pixel-silicon detectors and commissioning of the novel triggerless DAQ system is foreseen in 2022. We present results of the on-going analysis and developments towards a possible setup in 2023.