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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Hadron Structure and Spectroscopy 7
HK 37.7: Vortrag
Dienstag, 24. März 2015, 18:45–19:00, T/SR19
Hard exclusive ω-meson production at the COMPASS experiment — •Johannes ter Wolbeek, Horst Fischer, Matthias Gorzellik, Philipp Jörg, Kay Königsmann, Steffen Landgraf, Christopher Regali, Katharina Schmidt, Stefan Sirtl, and Tobias Szameitat — for the COMPASS collaboration, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg
In the theoretical framework of Generalized Parton Distributions (GPDs) the two-dimensional spatial information, given by form factors, and the longitudinal momentum information from the PDFs are combined to a three-dimensional picture of the nucleon. According to Ji’s sum rule, the GPDs H and E are directly connected to the total angular momenta of quarks and gluons. While H can be approached using electroproduction cross section, the exclusive production of ω-mesons off a transversely polarized target allows for access of GPD E.
At the COMPASS experiment at CERN measurements were performed using a longitudinally polarized 160 GeV/c muon beam and a transversely polarized NH3 target. This talk will introduce the data analysis of exclusive ω production and recent results will be presented and compared to theoretical predictions. Supported by BMBF, DFG and EU FP7 (Grant Agreement 283286).