Measurement of the FCNC decays K+- --> pi+- l+ l- by the NA48/2   experiment at CERN

Evgueni Goudzovski

arXiv:0908.3860·hep-ex·May 7, 2010

Measurement of the FCNC decays K+- --> pi+- l+ l- by the NA48/2 experiment at CERN

Evgueni Goudzovski

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Abstract

A sample of 7253 $K^{\pm} \to π^{\pm} e^{+} e^{-}$ decay candidates with 1.0% background contamination has been collected by the NA48/2 experiment at the CERN SPS, which allowed a precise measurement of the form factor, the branching ratio, and the CP violating asymmetry of $K^{+}$ and $K^{-}$ decay widths was investigated. The results of the $K^{\pm} \to π^{\pm} e^{+} e^{-}$ analysis, as well as the status of the $K^{\pm} \to π^{\pm} μ^{+} μ^{-}$ analysis based in the same data set, are reported.

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TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Particle Accelerators and Free-Electron Lasers