Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Hadron Structure and Spectroscopy VIII

HK 42.4: Vortrag

Donnerstag, 2. April 2020, 15:15–15:30, J-HS A

Proton Radius in High-Energy Muon Scattering — •Christian Dreisbach for the COMPASSplusplus/AMBER working group — 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 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. We present results of the on-going analysis on systematic effects in elastic lepton-proton scattering to leading and next-to-leading order to reach the required precision in the low-Q2 region and discuss ideas for a possible setup in 2022.

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