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# Measurement of the $\Lambda^0_b$ lifetime in the decay $\Lambda^0_b \rightarrow J/\psi\Lambda^0$ with the DO detector

Abstract : We present measurements of the Lambda^0_b lifetime in the exclusive decay channel Lambda^0_{b}->J/psi Lambda^0, with J/psi to mu+ mu- and Lambda^0 to p pi-, the B^0 lifetime in the decay B^0 -> J/psi K^0_S with J/psi to mu+ mu- and K^0_S to pi+ pi-, and the ratio of these lifetimes. The analysis is based on approximately 250 pb^{-1} of data recorded with the D0 detector in pp(bar) collisions at sqrt{s}=1.96 TeV. The Lambda^0_b lifetime is determined to be tau(Lambda^0_b) = 1.22 +0.22/-0.18 (stat) +/- 0.04 (syst) ps, the B^0 lifetime tau(B^0) = 1.40 +0.11/-0.10 (stat) +/- 0.03 (syst) ps, and the ratio tau(Lambda^0_b)/tau(B^0) = 0.87 +0.17/-0.14 (stat) +/- 0.03 (syst). In contrast with previous measurements using semileptonic decays, this is the first determination of the Lambda^0_b lifetime based on a fully reconstructed decay channel.
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Journal articles

http://hal.in2p3.fr/in2p3-00023273
Contributor : Yvette Heyd Connect in order to contact the contributor
Submitted on : Wednesday, November 10, 2004 - 3:20:42 PM
Last modification on : Monday, March 14, 2022 - 12:04:02 PM

### Citation

V.M. Abazov, R. Abbott, M. Abolins, B.S. Acharya, M. Adams, et al.. Measurement of the $\Lambda^0_b$ lifetime in the decay $\Lambda^0_b \rightarrow J/\psi\Lambda^0$ with the DO detector. Physical Review Letters, American Physical Society, 2005, 94, pp.102001-1-102001-7. ⟨10.1103/PhysRevLett.94.102001⟩. ⟨in2p3-00023273⟩

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