Precise measurement of Gamma(K -> e nu(gamma))/Gamma(K -> mu nu(gamma)) and study of K -> e nu gamma

We present a precise measurement of the ratio R(K) = Gamma(K -> e nu(gamma))/Gamma(K -> mu nu(gamma)) and a study of the radiative process K -> e nu gamma, performed with the KLOE detector. The results are based on data collected at the Frascati e(+)e(-) collider DA Phi NE for an integrated luminosity of 2.2 fb(-1). We find R(K) = (2.493 +/- 0.025(stat) +/- 0.019(syst)) x 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. We also measured the differential decay rate d Gamma(K -> e nu gamma)/dE(gamma) for photon energies 10 < E(gamma) < 250 MeV. Results are compared with predictions from theory.