Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Hadronenstruktur und -spektroskopie
HK 37.1: Vortrag
Donnerstag, 20. März 2014, 14:00–14:15, HZ 1+2
Hard exclusive meson production to constrain GPDs — •Johannes ter Wolbeek, Horst Fischer, Matthias Gorzellik, Arne Gross, Philipp Jörg, Kay Königsmann, Pasquale Malm, Christopher Regali, Katharina Schmidt, Stefan Sirtl, and Tobias Szameitat — for the COMPASS collaboration, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg
The concept of Generalized Parton Distributions (GPDs) combines the two-dimensional spatial information, given by form factors, with the longitudinal momentum information from the PDFs. Thus, GPDs provide a three-dimensional ’tomography’ of the nucleon. Furthermore, according to Ji’s sum rule, the GPDs H and E enable access to the total angular momenta of quarks, antiquarks and gluons. While H can be approached using electroproduction cross section, hard exclusive meson production off a transversely polarized target can help to constrain the GPD E.
At the COMPASS experiment at CERN, two periods of data taking were performed in 2007 and 2010, using a longitudinally polarized 160 GeV/c muon beam and a transversely polarized NH3 target. This talk will introduce the data analysis of the process µ+p → µ′ + p′ + V and recent results will be presented. Supported by BMBF, DFG and EU FP7 (Grant Agreement 283286).