We report a measurement of the Lambda_{b};{0} lifetime using a sample corresponding to 1.3 fb;{-1} of data collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron collider. The Lambda_{b};{0} baryon is reconstructed via the decay Lambda_{b};{0}-->munu[over ]Lambda_{c};{+}X. Using 4437+/-329 signal candidates, we measure the Lambda_{b};{0} lifetime to be tau(Lambda_{b};{0})=1.290_{-0.110};{+0.119}(stat)-0.091+0.087(syst) ps, which is among the most precise measurements in semileptonic Lambda_{b};{0} decays. This result is in good agreement with the world average value.
Measurement of the Lambda_{b};{0} Lifetime Using Semileptonic Decays. Publishing Authors By Initials