On the short distance constraints from K(L,S) ---> mu+ mu-

By G. Isidori, R. Unterdorfer. 2003

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Motivated by new precise results on several KL decays, sensitive to the KL→γγ form factor, we present a new analysis of the KL→μ+μ− long-distance amplitude based on the semi-phenomenological approach of ref. [1]. Particular attention is devoted to the evaluation of the uncertainties of this method and to the comparison with alternative approaches. Our main result is a conservative upper bound of 2.5 × 10−9 on B(KL→μ+μ−)short, which is compatible with the SM expectation and which provides significant constraints on new-physics scenarios. The possibility to extract an independent short-distance information from future searches on KS→μ+μ− is also briefly discussed.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/896918b3016c7f37e126ea79f8ec786c2f1d436c