Measurement of the KL meson lifetime with the KLOE detector

Abstract

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… (More)

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