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The rare decay ηππγγ in chiral perturbation theory

G. Kn"ochlein, S. Scherer, D. Drechsel

hep-pharXiv:hep-ph/9601252

Abstract

We investigate the rare radiative eta decay modes ηπ+π-γγ and ηπ0π0γγ within the framework of chiral perturbation theory at O(p4). We present photon spectra and partial decay rates for both processes as well as a Dalitz contour plot for the charged decay.

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