Measurement of the branching fraction for the decay KS --> pi e nu

Preprint

25 March 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/0203232

Abstract

We present a measurement of the branching ratio BR(KS --> pi e nu) performed using the KLOE detector. KS mesons are produced in the reaction e+ e- --> phi --> KS KL at the DAFNE collider. In a sample of about 5 million KS-tagged events we find 624 +- 30 semileptonic KS decays. Normalizing to the KS --> pi+ pi- count in the same data sample, we obtain BR(KS --> pi e nu) = (6.91 +- 0.37) 10^-4, in agreement with the Standard Model expectation.

Keywords

BRANCHING FRACTION
STANDARD MODEL
DATA SAMPLE
KS DECAYS
PI E NU
TAGGED

All Related Versions

Version 1, 2002-03-25, ArXiv
Published version: Physics Letters B, 535 (1-4), 37.

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