Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Hadronenstruktur und -spektroskopie IV
HK 12.4: Vortrag
Montag, 21. März 2011, 17:30–17:45, HS3
Hard Exclusive ρ0 Production to Constrain GPDs — •Katharina Schmidt, Max Büchele, Horst Fischer, Fritz-Herbert Heinsius, Florian Herrmann, Tillmann Guthörl, Kay Königsmann, Louis Lauser, Andreas Mutter, Frank Nerling, Christian Schill, Sebastian Schopferer, and Johannes ter Wolbeek — on behalf of the COMPASS Collaboration - Physikalisches Institut, Albert-Ludwigs-Universität Freiburg
Investigation of the spin structure of the nucleon via deep inelastic scattering is a broad field of research. The recently developed theoretical framework of Generalized Parton Distributions (GPDs) provides a wealth of information concerning the nucleon. Additional to the longitudinal momentum information of partons they contain information on the transverse localization of the constituents. Furthermore they provide, via Ji’s sum rule, access to the total angular momentum of quarks and gluons, a very important missing piece in understanding the spin structure of the nucleon. One possible physical channel to constrain GPDs is the exclusive production of ρ0 mesons off a transversely polarized target. In 2007 first measurements were performed scattering a 160 GeV/c longitudinal polarized muon beam off a transversely polarized NH3 target at the COMPASS experiment at CERN. The data taking was continued in 2010.
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.