Measurements of the B+, B0, B0 s meson and Λ0 b baryon lifetimes

LHCb Collaboration, R. Aaij

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Measurements of b-hadron lifetimes are reported using pp collision data, corresponding to an integrated luminosity of 1.0 fb-1, collected by the LHCb detector at a centre-of-mass energy of 7TeV. Using the exclusive decays B+ → J/ψK+, B0 → J/ψK *(892)0, B0 → J/ψK0s, Λ0b → J/ψΛ and B0 s→ J/ψφ the average decay times in these modes are measured to be

τB+→J/ψK+ = 1.637 ± 0.004 ± 0.003 ps,τB0→J/ψK∗0 = 1.524 ± 0.006 ± 0.004 ps,τB0→J/ψK0s= 1.499 ± 0.013 ± 0.005 ps,τΛ0b→J/ψΛ = 1.415 ± 0.027 ± 0.006 ps,τB0s→J/ψφ = 1.480 ± 0.011 ± 0.005 ps, 

where the first uncertainty is statistical and the second is systematic. These represent the most precise lifetime measurements in these decay modes. In addition, ratios of these lifetimes, and the ratio of the decay-width difference, ΔΓd, to the average width, Γd, in the B0 system, Δ Γ d/ Γd = -0.044 ± 0.025 ± 0.011, are reported. All quantities are found to be consistent with Standard Model expectations.

Original languageEnglish
Article number114
Number of pages26
JournalJournal of High Energy Physics
Issue number4
Publication statusPublished - 16 Apr 2014


  • B physics
  • Flavor physics
  • Hadron-hadron scattering
  • Lifetime

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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