Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Hadronenstruktur und -spektroskopie

HK 42.3: Vortrag

Dienstag, 5. März 2013, 17:30–17:45, HSZ-304

Exclusive ρ ⁰ muoproduction on transversely polarised protons and deuterons — •Katharina Schmidt, Steffen Bauer, Horst Fischer, Florian Herrmann, Kay Königsmann, Michael Kunz, Tobias Kunz, Pasquale Malm, Christopher Regali, Robert Schäfer, Stefan Sirtl, Tobias Szameitat, 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 localisation of the constituents. The exclusive production of ρ⁰ mesons off a transversely polarised target allow for instance to constrain the GPD E which is connected, according to Ji’s sum rule, with the total angular momentum of quarks and gluons. At the COMPASS experiment at CERN measurements were performed scattering a 160 GeV/c longitudinal poalized muon beam off a transversely polarised ⁶LiD (2003-2004) and NH₃ (2007, 2010) target. The final state particles are detected with the two-stage spectrometer with high resolution tracking and calorimetry.
This talk gives an introduction to the analysis of exclusively produced ρ⁰ mesons. Results for the azimuthal asymmetry are presented. Supported by BMBF, DFG and EU FP7 (Grant Agreement 283286)