Precise measurement of Γ(K→e ν(γ))/Γ(K→μ ν(γ)) and study of K→e ν γ

We present a precise measurement of the ratio R K =Γ(K→e ν(γ))/Γ(K→μ ν(γ)) and a study of the radiative process K→e ν γ, performed with the KLOE detector. The results are based on data collected at the Frascati e + e − collider DAΦNE for an integrated luminosity of 2.2 fb−1. We find R K =(2.493±0.025stat±0.019syst)×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 dΓ(K→e ν γ)/dE γ for photon energies 10

Keywords:

• Detector
• Physics
• Particle physics
• Collider
• Quantum electrodynamics
• Minimal Supersymmetric Standard Model
• Lepton
• Standard Model
• Radiative process
• Photon
• Luminosity
• Nuclear physics

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