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Measurement of the Λb0\Lambda_b^0 lifetime in the decay Λb0→J/ψΛ0\Lambda_b^0 \to J/\psi \Lambda^0 with the D\O\ detector

Collaboration
Oct, 2004
7 pages
Published in:
  • Phys.Rev.Lett. 94 (2005) 102001
e-Print:
DOI:
Report number:
  • FERMILAB-PUB-04-286-E
Experiments:
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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.
Note:
  • 7 pages, 4 figures, Submitted to Physical Review Letters, v2: Added FNAL Pub-number
  • 14.40.Nd
  • 14.20.Mr
  • 13.25.Hw
  • 13.30.Eg
  • Lambda baryons
  • baryon hadronic decay
  • B mesons
  • meson hadronic decay
  • proton-proton inclusive interactions
  • anti-p p: colliding beams