Measurement of the absolute branching ratios for semileptonic $K^\pm$ decays with the KLOE detector - INSPIRE

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Measurement of the absolute branching ratios for semileptonic $K^\pm$ decays with the KLOE detector

KLOE

Collaboration

•

F. Ambrosino
(
- INFN, Naples
)

Dec, 2007

13 pages

Published in:

JHEP 02 (2008) 098

e-Print:

0712.3841 [hep-ex]

DOI:

10.1088/1126-6708/2008/02/098

PDG:

{{\mathit K}^{+}}

\rightarrow

{{\mathit \pi}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}

Experiments:

FRASCATI-DAFNE-KLOE

View in:

ADS Abstract Service

reference search37 citations

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Abstract: (arXiv)

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.

Note:

13 pages, 3 figures, submitted to JHEP. v2: minor revisions required by JHEP, v3: final version published by JHEP (replacement of 2 incorrect affiliations)link: http://www.iop.org/EJ/abstract/1029-8479/2008/02/098

e+-e- Experiments
electron positron: colliding beams
electron positron: annihilation
Phi(1020): electroproduction
K: pair production
K: semileptonic decay
K+: branching ratio
K-: branching ratio
form factor: decay
KLOE

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Figures(0)

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