Measurement of the absolute branching ratio for the $K^+ \to \mu^+ \nu(\gamma)$ decay with the KLOE detector - INSPIRE

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Measurement of the absolute branching ratio for the $K^+ \to \mu^+ \nu(\gamma)$ decay with the KLOE detector

KLOE

Collaboration

•

F. Ambrosino

Sep, 2005

11 pages

Published in:

Phys.Lett.B 632 (2006) 76-80

e-Print:

hep-ex/0509045 [hep-ex]

DOI:

10.1016/j.physletb.2005.11.008

PDG:

{{\mathit K}^{+}}

\rightarrow

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

Experiments:

FRASCATI-DAFNE-KLOE

View in:

ADS Abstract Service

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Abstract: (Elsevier)

We have measured the fully inclusive K+→μ+ν(γ) absolute branching ratio with the KLOE experiment at DAΦNE, the Frascati ϕ -factory. From some 865 283 K+→μ+ν(γ) decays obtained from a sample of ∼5.2×108 , ϕ -meson decays, we find BR(K+→μ+νμ(γ))=0.6366±0.0009stat.±0.0015syst. , corresponding to an overall fractional error of 0.27%. Using recent lattice results on the decay constants of pseudoscalar mesons one can obtain an estimate for the CKM mixing matrix element |Vus|=0.2223±0.0026 .

Note:

Corrected typos

electron positron: colliding beams
electron positron: annihilation
Phi(1020): electroproduction
K: pair production
K+: leptonic decay
K+: branching ratio
K+: radiative decay
CKM matrix matrix
KLOE
experimental results

References(12)

Figures(0)

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