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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Elektromagnetische und Hadronische Sonden

HK 9.5: Vortrag

Montag, 10. März 2008, 17:30–17:45, 1C

η → 3π^∘ decay with WASA-at-COSY. — •Peter Vlasov and Christian Pauly for the WASA-at-COSY collaboration — Institute für Kernphysik, Forschungzentrum Jülich, 52425 Jülich

During the first production run of the WASA-at-COSY experiment the η → 3π^∘ decay has been measured at Q = 55 MeV. The goal of this experiment is a high statistics measurement of the 3π^∘ Dalitz plot density distribution which allows precise test of ChPT calculations in non-perturbative regime of QCD.

The η mesons were produced in the interaction of the COSY proton beam with frozen hydrogen pellets delivered by the WASA Pellet Target. The components of the detection system can be subdivided into two parts: the Central Detector - mainly suited for detection of the η meson decay products and the Forward Detector which is used for tagging of the η decays by reconstruction of the protons scattered in the forward direction.

The events selected by the missing mass technique under restrictive conditions were analyzed. The π^∘ and η mesons mass hypothesis were used to constrain the kinematic variables.

We report on the status of the analysis of the η → 3π⁰ decay measured in proton-proton interactions from the first production run of the WASA-at-COSY experiment.

Supported in part by BMBF and FZ-Jülich.