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Measurement of the absolute branching ratios for semileptonic K+/- decays with the KLOE detector

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arxiv 0712.3841 v3 pith:BEDKIOXA submitted 2007-12-22 hep-ex

KLOE Collaboration This is my paper · ORCID
classification hep-ex
keywords decayskmu3semileptonicabsolutebranchingdetectorgammakloe
verification ladder T0 review T1 audit T2 compute T3 formal
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Using a sample of over 600 million phi->K+K- decays collected at the Dafne e+e- collider, we have measured with the KLOE detector the absolute branching ratios for the charged kaon semileptonic decays, K+/- -> p0 e nu (gamma) (Ke3) and K+/- -> p0 mu nu (gamma) (Kmu3). The results, BR(Ke3) = 0.04965 +/- 0.00038_{stat} +/- 0.00037_{syst} and BR(Kmu3) = 0.03233 +/- 0.00029_{stat} +/- 0.00026_{syst}, are inclusive of radiation. Accounting for correlations, we derive the ratio Kmu3/Ke3 = 0.6511+/-0.0064. Using the semileptonic form factors measured in the same experiment, we obtain V_{us}f_{+}(0) = 0.2141 +/- 0.0013.

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  1. Semileptonic kaon decays and the precise determination of $V_{us}$

    hep-ph 2025-02 unverdicted novelty 2.0 of 10

    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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