Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 46: Hadron Structure and Spectroscopy VI
HK 46.2: Group Report
Thursday, March 30, 2017, 17:15–17:45, F 5
Measurement of the exclusive π0 muoproduction cross section at COMPASS — Horst Fischer, Simon Gerstner, •Matthias Gorzellik, Pirmin Hofmeier, Philipp Jörg, Christopher Regali, and Tobias Szameitat — Albert-Ludwigs-Universität Freiburg
At COMPASS Deeply Virutal Compton Scattering and Deeply Virtual Meson Production (DVMP) processes are studied in order to probe the partonic structure of the nucleon by constraining Generalized Parton Distribution (GPD) models.
Extending beyond semi-inclusive deep inelastic scattering, the measurement of
lepton-induced exclusive reactions enables the study of GPDs, which ultimately
reveal the three dimensional picture of the nucleon and the decomposition of
its total angular momentum.
The COMPASS experiment at CERN uses a high intensity tertiary muon beam with a
momentum of 160 GeV/c impinging on a 2.5 m-long unpolarized liquid
hydrogen target.
To ensure the exclusivity and precision of the measurement, the wide angle
electromagnetic calorimetry together with the two-stage magnetic spectrometer
is complemented with a new barrel-shaped time-of-flight system surrounding the
target.
Exploiting the flavour filtering character of DVMP measurements, the COMPASS
experiment is able to access different combinations of quark and gluon GPDs by
determining the cross sections for various mesons.
We report on the first extraction of the exclusive π0 cross section in the
intermediate xBj domain ranging from 0.01 to 0.15.
∗Supported by BMBF and the DFG Research
Training Group Programme 2044.