Precise measurement of B(K\to eν(γ))/B(K\to μν(γ)) and study of K\to eνγ

Abstract

We present a precise measurement of the ratio R_K=B(K\to eν(γ))/B(K\to μν(γ)) and a study of the radiative process $K\to e\nu \gamma$, 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\pm0.019)x10^{-5}$,inagreementwiththeStandardModelexpectation.ThisresultisusedtoimproveconstraintsonparametersoftheMinimalSupersymmetricStandardModelwithleptonflavorviolation.Wealsomeasuredthedifferentialdecayrate$dΓ(K\to eνγ)/dE_γ$forphotonenergies$10<E_γ<250$ MeV. Results are compared with predictions from theory.

Submitted to European Physics Journal C

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