Measurement of the Λb Lifetime in the Exclusive Decay ΛbJ/ψΛ

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. Lett. 99, 142001 – Published 1 October 2007

Abstract

We have measured the Λb lifetime using the exclusive decay ΛbJ/ψΛ, based on 1.2fb1 of data collected with the D0 detector during 2002–2006. From 171 reconstructed Λb decays, where the J/ψ and Λ are identified via the decays J/ψμ+μ and Λpπ, we measured the Λb lifetime to be τ(Λb)=1.2180.115+0.130(stat)±0.042(syst)ps. We also measured the B0 lifetime in the decay B0J/ψ(μ+μ)KS0(π+π) to be τ(B0)=1.5010.074+0.078(stat)±0.050(syst)ps, yielding a lifetime ratio of τ(Λb)/τ(B0)=0.8110.087+0.096(stat)±0.034(syst).

  • Figure
  • Figure
  • Received 1 May 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.142001

©2007 American Physical Society

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Vol. 99, Iss. 14 — 5 October 2007

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