A measurement of the branching ratio of K+-- ->pi+--mu+mu- decays in the Hyper CP experiment
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A measurement of the branching ratio of K+-- ->pi+--mu+mu- decays in the Hyper CP experiment

Abstract

Large samples of hyperon and kaon decays were collected with the Hyper CP spectrometer during two fixed-target runs at Fermilab. Based on an analysis of 110 million K pm decays from the 1997 data sample we present a branching ratio for K pm right arrow pi pm mu+ mu-. This is the first observation of K- right arrow pi- mu+ mu- decay.

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