Precision measurement of the Λb0 baryon lifetime

The LHCb Collaboration

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The ratio of the Λb0 baryon lifetime to that of the B ̄0 meson is measured using 1.0 fb-1 of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λb0 baryon is observed for the first time in the decay mode Λb0→J/ψpK-, while the B̄0 meson decay used is the well known B̄0→J/ψπ+K - mode, where the π+K- mass is consistent with that of the K̄*0(892) meson. The ratio of lifetimes is measured to be 0.976±0.012±0.006, in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the B̄0 meson lifetime, the Λb0 lifetime is found to be 1.482±0.018±0.012 ps. In both cases, the first uncertainty is statistical and the second systematic.

Original languageEnglish
Article number102003
Number of pages8
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 5 Sep 2013
Externally publishedYes

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