Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Hadron Structure and Spectroscopy V

HK 30.7: Talk

Wednesday, February 28, 2018, 15:45–16:00, HZO 50

Analysis of COMPASS data on DVCS — •Johannes Giarra — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 45, 55099 Mainz

In 2016 and 2017 a measurement of the Deeply Virtual Compton Scattering (DVCS) was performed at the M2 beamline of the CERN SPS by using 160 GeV positive and negative charged muon beams scattering off a liquid hydrogen target. The scattered muons and the produced real photons were detected by the COMPASS spectrometer, which was supplemented by an additional electromagnetic calorimeter for the detection of large angle photons. The recoil protons were detected by the CAMERA detector, which consists of two barrels of scintillators surrounding the 2.5 m long target. The time of flight (TOF) measurement performed by the detector is used to identify the protons.
To select the DVCS events after track reconstruction a precise determination of the target position is necessary. Also for a precise determination of the muon flux, which is needed for the calculation of the cross section, the position of the target is crucial.
The talk will cover a method to precisely determine the target position and will show its influence on the muon flux.