tau-->eta(eta')2pi nu, 3pi nu and WZW anomaly

Abstract

The effects of the anomalous contact terms are taken into account in tau to eta(eta')2pi nu decay. tau to 3pi nu is computed. Theoretical result agrees with data. It is the first time the anomalous vertex eta aa is tested. An a_{1} resonance is predicted in the final state. The decay rate of tau to eta'3pi nu is predicted.

15 pages, one latex file for the paper and one p-script file for the figure

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