The Forward preshower system and a study of the $J/\psi$ trigger with the D0 detector

Abstract

mass energy √s = 1.96 TeV. We obtain τ (Λ0b ) = 1.303 ± 0.075 (stat.) ± 0.035 (syst.) ps, τ (B0) = 1.508±0.025 (stat.)±0.043 (syst.) ps and τ (Λ0b )/τ (B0) = 0.864± 0.052 (stat.)±0.033 (syst.). These measurements supersede previous results of the DØ Collaboration using the same decay channels. Our measurement of the lifetime ratio is in excellent agreement with theoretical predictions and compatible with the current world-average, but differs with the latest measurement of the CDF Collaboration in more than 2 standard deviations.

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