Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 61: Hadronenstruktur und -spektroskopie
HK 61.8: Vortrag
Donnerstag, 7. März 2013, 16:00–16:15, HSZ-105
Spin alignment and OZI violation in exclusive ω and φ production with pp collisions at COMPASS — •Johannes Bernhard — for the COMPASS collaboration
Institut für Kernphysik, Johannes-Gutenberg-Universität, 55099 Mainz
The COMPASS collaboration investigates the exclusive production of ω and φ mesons with a 190 GeV proton beam on a liquid hydrogen target with the aim to explore the interplay of several production mechanisms. For this, cross section ratios and their dependence on xF of the leading proton pfast and the mass of the pfastV system are determined. We find a significant violation of the OZI rule which can be partly explained by the role of intermediate baryon resonances contributing to ω production. Additionally, the spin alignment of the vector mesons is measured within a set of reference frames which are sensitive to different production types. Again, dependencies of the alignment on xF and the pfastV mass are found which differ significantly for ω and φ.
This work is supported by the BMBF.