Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Hadron Structure and Spectroscopy II

HK 10.2: Group Report

Monday, March 28, 2022, 14:30–15:00, HK-H9

Study of exclusive reactions in muon-proton scattering at COMPASS — •Johannes Giarra — on behalf of the COMPASS collaboration - Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 45, 55099 Mainz

In 2016/17 a measurement of exclusive reactions in the muon-proton scattering was performed in order to determine the cross section of the Deeply Virtual Compton Scattering (DVCS) process and exclusive meson production.
The COMPASS spectrometer is located at the M2 beamline of the CERN SPS, which provides a 160 GeV positively and negatively charged muon beam. The muons were scattered off a 2.5m long liquid hydrogen target. To perform an exclusive measurement of the processes the COMPASS spectrometer was supplemented by an additional electromagnetic calorimeter to increase the acceptance for the detection of large angle photons and a proton recoil detector.
The talk will summarize the current status in the analysis for determining the cross section of the DVCS and the exclusive single π⁰ production. A focus will be on a detailed description of the methods and analysis steps used to extract the cross sections. A preliminary result on the t-dependence of the DVCS cross section will be presented.