Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Hadron Structure and Spectroscopy IX
HK 52.6: Vortrag
Mittwoch, 30. März 2022, 17:15–17:30, HK-H8
Unified Tracking Stations for the Proton-Radius Measurement at AMBER — •Karl Eichhorn 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. A combined measurement of the recoil proton and the muon trajectory will be performed. In addition to the precise information about the recoil proton provided by the TPC, a novel unified tracking station is foreseen for an accurate measurement of the scattered muon. Thin scintillating fibers read out by SiPMs joint with monolithic silicon-pixel detectors are used for the reconstruction of the scattered muon. A first prototype beam test is foreseen in the year 2022. We present on-going studies and developments of this unified tracking station.