KL -> pi0 gamma e+ e- and its relation to CP and chiral tests
John F. Donoghue, Fabrizio Gabbiani
Abstract
The decay KL -> pi0 gamma e+ e- occurs at a it higher rate than the nonradiative process KL -> pi0 e+ e-, and hence can be a background to CP violation studies using the latter reaction. It also has an interest in its own right in the context of chiral perturbation theory, through its relation to the decay KL -> pi0 gamma gamma. The leading order chiral loop contribution to KL -> pi0 gamma e+ e-, including the [q(e+) + q(e-)]2/m2(pi) dependence, is completely calculable. We present this result and also include the higher order modifications which are required in the analysis of KL -> pi0 gamma gamma.
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