Can we extract short-distance information from B(KL -> mu+ mu-)?
G. D'Ambrosio, G. Isidori, J. Portoles
Abstract
A new analysis of the long-distance two-photon dispersive amplitude of KL -> mu+ mu- is presented. We introduce a phenomenological parameterization of the KL -> gamma* gamma* form factor, constrained at low energies by KL -> gamma l+ l- (l = e,mu) data and at high energies by perturbative QCD. Using this form factor we provide a reliable estimate of magnitude and relative uncertainty of the two-photon dispersive contribution to KL -> mu+ mu-. We finally discuss the implications of this analysis for the extraction of short-distance information from B(KL -> mu+ mu-).
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