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Unitarity and K(L) ---> pi0 gamma gamma

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Unitarity and K(L) ---> pi0 gamma gamma

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Cohen, Andrew G.; Ecker, Gerhard; Pich Zardoya, Antonio Perfil

This document is a artículoDate1993

Este documento está disponible también en : http://hdl.handle.net/10550/42293

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We discuss the rare decay K(L) --> pi0gammagamma. Although the recently measured 2gamma-invariant-mass distribution is in quite good agreement with the lowest-order chiral perturbation theory prediction, there seems to be a discrepancy with the calculated branching ratio. We extend the previous computations to next-to-leading order, O(p6). The two dominant mechanisms at this order are emphasized: the two-pion intermediate state and vector meson exchange.

Cohen, Andrew G. Ecker, Gerhard Pich Zardoya, Antonio 1993 Unitarity and K(L) ---> pi0 gamma gamma Physics Letters B 304 3-4 347 352

http://dx.doi.org/10.1016/0370-2693(93)90307-4