ep - e x / 05 09 04 5 v 1 2 9 Se p 20 05 Measurement of the Absolute Branching Ratio for the K + → μ + ν ( γ ) Decay with the KLOE Detector
نویسندگان
چکیده
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+ → μνμ(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.
منابع مشابه
0 Se p 20 05 Measurement of the Absolute Branching Ratio for the K + → μ + ν ( γ ) Decay with the KLOE Detector
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+ → μνμ(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 pseudosc...
متن کاملO ct 2 00 5 Measurement of the Absolute Branching Ratio for the K + → μ + ν ( γ ) Decay with the KLOE Detector
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+ → μνμ(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 pseudosc...
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The most precise determinations of Vus comes from semileptonic kaon decays. The KLOE experiment at DAΦNE the Frascati φ factory , has measured all the experimental inputs to Vus for both neutral and charged kaons. Preliminary results for BR(K± → π0e±ν) and BR(K± → π0μ±ν), and for τ± are presented, together with measurements of the KLe3 and KLμ3 decay BR, the KSe3 decay BR and the KL lifetime τL...
متن کاملMeasurement of the absolute branching ratio of the K + → π + π 0 ( γ ) decay with the KLOE detector
We have measured the absolute branching ratio of the K+ → π+π0 (γ) decay, using ∼20 million tagged K+ mesons collected with the KLOE detector at DAΦNE, the Frascati φ–factory. Signal counts are obtained from the fit of the distribution of the momentum of the charged decay particle in the kaon rest frame. The result, inclusive of final-state radiation, is BR(K+ → π+π0 (γ))=0.2065± 0.0005stat ± 0...
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