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Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Hadronenstruktur und -spektroskopie

HK 6.7: Talk

Monday, March 4, 2013, 12:45–13:00, HSZ-304

Measuring the relative branching ratio and the Eγ-distribution of η → π+ π γ with WASA-at-COSYDaniel Lersch1 and •Frank Goldenbaum1,21Jülich Center for Hadron Physics, Forschungszentrum Jülich — 2Bergische Universität Wuppertal, FB C

The decay channel η→ π+ π γ provides the opportunity to study QCD anomalies at the chiral limit. The decay width and the shape of the Eγ-distribution of this channel are sensitive to the box anomly term which is part of the Wess-Zumino-Witten-(WZW) Lagrangian. However, the theoretically predicted decay width and Eγ-distribution do not agree with the experimental results, if final state interactions are not included by unitarized extensions of the WZW-Lagrangian. The experimental observables for testing these extensions are (i) the (relative) branching ratio (done by CLEO and KLOE) and (ii) the distribution of the photon energy Eγ.

In order to measure both observables in one experiment, the WASA-at-COSY collaboration has measured the reaction pppp[η→ π+πγ]. The status on reconstructing this channel will be presented together with results on the channel η→ π+ππ0 which is a major component of the background to the channel of interest, and is needed to normalise the measured partial width. In this presentation the methods and preliminary results will be presented.

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