Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Hadronenstruktur und -spektroskopie
HK 23.7: Talk
Wednesday, March 21, 2012, 15:45–16:00, RW 2
Hard exclusive ρ0 production to constrain generalized parton distributions — •Katharina Schmidt, Steffen Bauer, Horst Fischer, Tillmann Guthörl, Kay Königsmann, Frank Nerling, Christian Schill, Stefan Sirtl, and Johannes ter Wolbeek — for the COMPASS collaboration - Physikalisches Institut, Albert-Ludwigs-Universität Freiburg
The theoretical framework of Generalized Parton Distributions (GPDs) provides a dynamical and geometrical picture of the nucleon. Additional to the longitudinal momentum information of partons they contain information on the transverse localization of the constituents. The exclusive production of ρ0 mesons off a transversely polarized target allow to constrain the GPD E which is connected, according to Ji’s sum rule, with the total angular momentum of quarks and gluons.
In 2007 & 2010 measurements were performed scattering a 160 GeV/c longitudinal polarized muon beam off a transversely polarized NH3 target at the COMPASS experiment at CERN.
This talk gives an introduction to the analysis of exclusively produced ρ0 mesons. Results for the transverse target single spin asymmetry AUTsin(φ − φs) are presented. Supported by BMBF, DFG and EU FP7 (Grant Agreement 227431).