München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Hadron Structure and Spectroscopy IV
HK 25.3: Talk
Tuesday, March 19, 2019, 17:15–17:30, HS 13
High-precision Measurement of the Proton Radius with TPC — •Vahe Sokhoyan — Universität Mainz, Institut für Kernphysik
The so-called "proton radius puzzle" originated due to a striking discrepancy between the electric charge radius of the proton, extracted from the muonic hydrogen Lamb shift, compared to the CODATA value, based on electron-proton scattering experiments as well as most of the atomic transition measurements in electronic hydrogen. To address this puzzle, a high-precision measurement of the differential ep scattering cross section in the region of low momentum transfer (0.002 GeV2 ≤ Q2 ≤ 0.04 GeV2) will be performed at the Mainz Microtron (MAMI). The experimental setup consisting of a Hydrogen Time Projection Chamber and Forward Tracking System will allow us to measure the energy as well as the angle of the recoil proton in combination with the angle of the forward scattered electron. This is a completely new approach for the extraction of the proton radius, compared to previous low-Q2 scattering experiments. Moreover, the construction of the Time Projection Chamber and Forward Tracking System will open avenue for various experiments using deuterium and helium targets with a detection of recoil particles in the final state. In this talk, the current status of this project and the future plans will be presented.