An evaluation of broken vertical bar V-us broken vertical bar and precise tests of the Standard Model from world data on leptonic and semileptonic kaon decays
We present a global analysis of leptonic and semileptonic kaon decay data, including all recent results published by the BNL-E865, KLOE, KTeV, ISTRA+ and NA48 experiments. This analysis, in conjunction with precise lattice calculations of the hadronic matrix elements now available, leads to a very precise determination of broken vertical bar V-us broken vertical bar and allows us to perform several stringent tests of the Standard Model. ; The authors thank P. Franzini and all other members of the FlaviaNet Kaon Working Group, as well as V. Lubicz and A. Jüttner of the FlaviaNet Lattice Averaging Group (FLAG), for useful discussion, comments, and suggestions. This work is supported by the European Union Sixth Framework Programme under contract MTRN-CT-2006- 035482, FlaviaNet. E.P. acknowledges financial support from MEC (Spain) under grant FPA2007-60323. F.M. acknowledges financial support from projects FPA2007- 66665, 2009SGR502. E.P. and F.M. acknowledge support from the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042). G.I. acknowledges support from the Technische Universität München- Institute for Advanced Study, funded by the German Excellence Initiative. ; Peer reviewed