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

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

2009-07-21

arxiv.org/abs/0907.3594v2

Eur.Phys.J.C64:627-636,2009; Erratum-ibid.65:703,2010

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to European Physics Journal C

Scientific paper

10.1140/epjc/s10052-009-1177-x 1

We present a precise measurement of the ratio R_K=B(K\to e\nu(\gamma))/B(K\to \mu\nu(\gamma)) 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}$, 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 $d\Gamma(K\to e\nu\gamma)/dE_\gamma$ for photon energies $10

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