KL -> pi0 gamma gamma and the bound on the CP-conserving KL -> pi0 e+e-
Abstract
It has been known for many years that there is a CP-conserving component for the decay mode KL -> pi0 e+e- and that its magnitude can be obtained from a measurement of the amplitudes in the KL -> pi0 gamma gamma decay mode. We point out that the usual description of the latter in terms of a single parameter, aV, is not sufficient to extract the former in a model independent manner. We further show that there exist known physics contributions to KL -> pi0 gamma gamma that cannot be described in terms of the single parameter aV. We conclude that a model independent analysis requires the experimental extraction of three parameters.
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