Using a sample of over 600 million phi --> K+ K- decays collected at the DA Phi NE e(+)e(-) collider, we have measured with the KLOE detector the absolute branching ratios for the charged kaon semileptonic decays, K+/- --> pi(0)e(+/-)nu(gamma) and K+/- --> pi(0)mu(+/-)nu(gamma). The results, BR(K-e3) = 0.04965 +/- 0.00038(stat) +/- 0.00037(syst) and BR(K-mu 3) = 0.03233 +/- 0.00029(stat) +/- 0.00026(syst), are inclusive of radiation. Accounting for correlations, we derive the ratio Gamma(K-mu 3)/Gamma(K-e3) = 0.6511 +/- 0.0064. Using the semileptonic form factors measured in the same experiment, we obtain vertical bar V-us f(+)(0)vertical bar = 0.2141 +/- 0.0013.

Measurement of the absolute branching ratios for semileptonic K+/- decays with the KLOE detector / Ambrosino, F., A., A., M., A., F., A., C., B., P., B., G., B., S., B., C., B., C., B., S., B., F., B., P., B., R., C., P., C., G., C., T., C., F., C., S., C., Chiefari, G., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - (2008), pp. 098-104. [10.1088/1126-6708/2008/02/098]

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

AMBROSINO, FABIO;CHIEFARI, GIOVANNI;MASSAROTTI, PAOLO;NAPOLITANO, MARCO;SARACINO, GIULIO;
2008

Abstract

Using a sample of over 600 million phi --> K+ K- decays collected at the DA Phi NE e(+)e(-) collider, we have measured with the KLOE detector the absolute branching ratios for the charged kaon semileptonic decays, K+/- --> pi(0)e(+/-)nu(gamma) and K+/- --> pi(0)mu(+/-)nu(gamma). The results, BR(K-e3) = 0.04965 +/- 0.00038(stat) +/- 0.00037(syst) and BR(K-mu 3) = 0.03233 +/- 0.00029(stat) +/- 0.00026(syst), are inclusive of radiation. Accounting for correlations, we derive the ratio Gamma(K-mu 3)/Gamma(K-e3) = 0.6511 +/- 0.0064. Using the semileptonic form factors measured in the same experiment, we obtain vertical bar V-us f(+)(0)vertical bar = 0.2141 +/- 0.0013.
2008
Measurement of the absolute branching ratios for semileptonic K+/- decays with the KLOE detector / Ambrosino, F., A., A., M., A., F., A., C., B., P., B., G., B., S., B., C., B., C., B., S., B., F., B., P., B., R., C., P., C., G., C., T., C., F., C., S., C., Chiefari, G., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - (2008), pp. 098-104. [10.1088/1126-6708/2008/02/098]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/478961
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