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First exploratory calculation of the long-distance contributions to the rare kaon decays K→πℓ+ℓ−
Physical Review D
The rare decays of a kaon into a pion and a charged lepton/antilepton pair proceed via a flavour changing neutral current and therefore may only be induced beyond tree level in the Standard Model. This natural suppression makes these decays sensitive to the effects of potential New Physics. The CP conserving K→πℓ^+ℓ^- decay channels however are dominated by a single photon exchange; this involves a sizeable long-distance hadronic contribution which represents the current major source ofdoi:10.1103/physrevd.94.114516 fatcat:e6etcib74ngvxpop4wajn3jzpa