Proton Radius in High-Energy Muon Scattering

Apr 9, 2019, 3:00 PM
Cavallerizza Reale - Aula Magna

Cavallerizza Reale - Aula Magna

Via Verdi 9, Turin
Parallel Session Talk WG7: Future of DIS WG7: Future of DIS


Mr Christian Dreisbach (Technische Universitaet Muenchen (DE))


The proton radius can be determined by measuring the slope of the electric form factor at small squared four-momentum transfer $Q^2$. 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 $Q^2$ 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.

Primary authors

Mr Alexander Inglessi (Petersburg Nuclear Physics Institute (PNPI)) Mr Benjamin Veit (Universität Mainz, Institut für Kernphysik) Prof. Bernhard Ketzer (Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik) Mr Christian Dreisbach (Technische Universitaet Muenchen (DE)) Eva-Maria Kabuss (Johannes Gutenberg Universitaet Mainz (DE)) Jan Michael Friedrich (Technische Universitaet Muenchen (DE)) Martin Kurt Hoffmann (Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik) Dr Oleg Kiselev (GSI Darmstadt) Dr Sebastian Uhl (Technische Universitaet Muenchen (DE)) Prof. Stephan Paul (Technische Universitaet Muenchen (DE))

Presentation materials