We present a measurement of the branching ratio BR(K-S --> pi(+/-)e(-/+)v(v)) performed using the KLOE detector. K-S-mesons are produced in the reaction e(+)e(-) --> phi --> KSKL at the DAPhiNE collider. In a sample of similar to 5 x 106 K-S-tagged events we find 624+/-30 semileptonic K-S decays. Normalizing to the K-S --> pi(+)pi(-) count in the same data sample, we obtain BR(K-S --> piev) = (6.91+/-0.37) x 10(-4), in agreement with the Standard Model expectation.
Measurement of the branching fraction for the decay K(S) -> pi e nu.
GORINI, Edoardo;PRIMAVERA, Margherita;VENTURA, Andrea;
2002-01-01
Abstract
We present a measurement of the branching ratio BR(K-S --> pi(+/-)e(-/+)v(v)) performed using the KLOE detector. K-S-mesons are produced in the reaction e(+)e(-) --> phi --> KSKL at the DAPhiNE collider. In a sample of similar to 5 x 106 K-S-tagged events we find 624+/-30 semileptonic K-S decays. Normalizing to the K-S --> pi(+)pi(-) count in the same data sample, we obtain BR(K-S --> piev) = (6.91+/-0.37) x 10(-4), in agreement with the Standard Model expectation.File in questo prodotto:
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