A ug 2 00 5 Measurements of the Absolute Branching Ratios for the Dominant K L Decays , the K L Lifetime , and V us with the KLOE Detector
نویسندگان
چکیده
From a sample of about 10 φ mesons produced at DAΦNE, we have selected KL mesons tagged by observing KS → ππ decays. We present results on the major KL branching ratios, including those of the semileptonic decays needed for the determination of |Vus|. These branching ratio measurements are fully inclusive with respect to final-state radiation. The KL lifetime has also been measured.
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متن کاملar X iv : h ep - e x / 05 07 08 8 v 1 2 0 Ju l 2 00 5 Measurement of the K L meson lifetime with the KLOE detector
We present a measurement of the KL lifetime using the KLOE detector. From a sample of ∼ 4 × 108 KSKL pairs following the reaction e+e− → φ → KSKL we select ∼ 15 × 106 KL → π0π0π0 decays tagged by KS → π+π− events. From a fit of the proper time distribution we find τL = (50.92 ± 0.17stat ± 0.25syst) ns. This is the most precise measurement of the KL lifetime performed up to date. PACS: keywords:
متن کاملx / 05 07 08 8 v 2 1 7 O ct 2 00 5 Measurement of the K L meson lifetime with the KLOE detector
We present a measurement of the KL lifetime using the KLOE detector. From a sample of ∼ 4 × 10 KSKL pairs following the reaction ee → φ → KSKL we select ∼ 15 × 10 KL → πππ decays tagged by KS → ππ events. From a fit of the proper time distribution we find τL = (50.92 ± 0.17stat ± 0.25syst) ns. This is the most precise measurement of the KL lifetime performed to date. PACS: keywords:
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