Test of lepton flavor violation with Ke2 decay at KLOE

Abstract

We present a precise measurement of the ratio R_K = Γ(Ke2(γ))/Γ(K\mu2(γ)) performed with the KLOE detector. The results are based on data collected at the Frascati e^+e^- collider DAFNE for an integrated luminosity of 2.2 fb^{-1}. We find R_K = (2.493\pm0.025_{stat}\pm0.019_{syst})\times 10^{-5}, in agreement with the Standard Model expectation. This result is used to improve constraints on parameters of the Minimal Supersymmetric Standard Model with lepton flavor violation.

arXiv comment6 pages, prepared for KAON09 Conference, Tsukuba 9-12 June 2009