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Measurement of the Λ<sub>b</sub> lifetime in the exclusive decay Λ<sub>b</sub> → J/ψ Λ.

Research output: Contribution to journalJournal article


Journal publication date1/10/2007
JournalPhysical Review Letters
Original languageEnglish


We have measured the b lifetime using the exclusive decay bJ/, based on 1.2 fb-1 of data collected with the D0 detector during 2002–2006. From 171 reconstructed b decays, where the J/ and are identified via the decays J/µ+µ- and p, we measured the b lifetime to be (b)=1.218(stat)±0.042(syst) ps. We also measured the B0 lifetime in the decay B0J/(µ+µ-)K(+-) to be (B0)=1.501(stat)±0.050(syst) ps, yielding a lifetime ratio of (b)/(B0)=0.811(stat)±0.034(syst).