Heidelberg 2015 – wissenschaftliches Programm

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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.