The rare decay K L → π 0 μ + μ − within the SM

We present an updated analysis of the rare decay KL → πμμ within the Standard Model. In particular, we present the first complete calculation of the two-photon CPconserving amplitude within Chiral Perturbation Theory, at the lowest non-trivial order. Our results confirm previous findings that the CP-conserving contribution to the decay rate cannot be… (More)