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

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

2007-12-22

arxiv.org/abs/0712.3841v3

JHEP 0802:098,2008

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 3 figures, submitted to JHEP. v2: minor revisions required by JHEP, v3: final version published by JHEP (replacement

Scientific paper

10.1088/1126-6708/2008/02/098

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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