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

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arxiv hep-ph/0203232 v1 pith:GZJEEYVU submitted 2002-03-25 hep-ph hep-ex

The KLOE Collaboration This is my paper · ORCID
classification hep-phhep-ex
keywords branchingmeasurementsampleagreementcollidercountdafnedata
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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.

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    A hybrid chiral perturbation theory and lattice QCD treatment of radiative corrections to kaon semileptonic decays is claimed to reach 10^-4 precision, yielding V_us = 0.22308(39)(39)(3) and sharpening the Cabibbo ang...

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