New results and Possibilities in K Physics

The flavor physics and CP violation, which is the main theme of B physics, has been also investigated in K physics for a long time. The first discoveries of particle-antiparticle (K-K̄0) mixing and CP violation are examples of its achievements. Since K contains s-quark, the K-physics is complementary with the B-physics which studies the transitions from bquark. In an experimental viewpoint, most of K experiments have been performed as fix-target experiments in contrast with the fact of mostly collider experiments in the case of B. They can collect a large amount of decays to make highly precise measurements, or to attack very rare modes. The biannual international meeting of K-physics, KAON07, will be held at Frascatti next week. Here, several recent topics are picked up from the KAON07 program: |Vus| measurements, check of μ-e universality through Kl2 decays, new CP-violation searches through the charge asymmetry in Kπ3 decay and muon transverse polarization in Kμ3 decay and K → πνν̄ experiments using K and K L. For other topics and more detail information about recent K-physics, please visit the web site of KAON07. [1]