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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Hadron Structure and Spectroscopy 2
HK 9.1: Gruppenbericht
Montag, 23. März 2015, 14:30–15:00, T/SR25
Partial Wave Analyses of Antiproton-Proton Annihilations in Flight — •Julian Pychy, Helmut Koch, Bertram Kopf, and Ulrich Wiedner — Institut für Experimentalphysik I, Ruhr-Universität Bochum
To investigate important aspects for the upcoming PANDA experiment,
partial wave analyses (PWA) of pp-annihilation
processes are carried out
using data from the Crystal Barrel (LEAR) experiment.
A coupled channel analysis of the three reactions resulting in the final states
K+K−π0, π0π0η and π0ηη at a beam momentum of
900 MeV/c is currently in progress.
Preliminary results on the determination of resonance contributions and of the
spin density matrix (SDM) of different light mesons are presented.
The elements of the SDM provide important information about the production process.
Furthermore, results of the analyses of the channels ωπ0, ωπ0η and
π+π−π0π0 are discussed. These studies are focused on the
determination of the contributing angular momenta of the pp-system
as well as of the SDM of the ω meson. Significant
spin-alignment effects depending on the production angle are visible here.
These results are compared with those for the φ(1020) in the
K+K−π0 channel.
All analyses have been performed using PAWIAN, a common, object-oriented and easy-to-use
PWA software that is being developed at the Ruhr-Universität Bochum.
This presentation summarizes recent activities of the Crystal Barrel (LEAR) Collaboration.
Supported by the BMBF.