We have measured the fully inclusive K + → μ+ν(γ ) absolute branching ratio with the KLOE experiment at DAFNE, 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.
MEASUREMENT OF THE ABSOLUTE BRANCHING RATIO FOR THE K+ ---> MU+ NU(GAMMA) DECAY WITH THE KLOE DETECTOR / Ambrosino, Fabio; Napolitano, Marco; Saracino, Giulio; Massarotti, Paolo; Kloe, Collaboration. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 632:(2006), pp. 76-80. [10.1016/j.physletb.2005.11.008]
MEASUREMENT OF THE ABSOLUTE BRANCHING RATIO FOR THE K+ ---> MU+ NU(GAMMA) DECAY WITH THE KLOE DETECTOR.
AMBROSINO, FABIO;NAPOLITANO, MARCO;SARACINO, GIULIO;MASSAROTTI, PAOLO;
2006
Abstract
We have measured the fully inclusive K + → μ+ν(γ ) absolute branching ratio with the KLOE experiment at DAFNE, 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.| File | Dimensione | Formato | |
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