出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：I present a brief overview of the theoretical status of K`3 decays and their use as probes of lepton
universality, light quark mass ratios, and CKM unitarity. I discuss in some detail the constraints
imposed on the light quark masses by current measurements of the ratio of charged to neutral K`3
rates.
