The LHCb measurement of the lifetime ratio of the Λ0b baryon to the B-0 meson is updated using data corresponding to an integrated luminosity of 3.0 fb-1 collected using 7 and 8 TeV centre-of-mass energy pp collisions at the LHC. The decay modes used are Λ0b→J/ψpK- and B-0→J/ψπ+K-, where the π+K- mass is consistent with that of the K-*0(892) meson. The lifetime ratio is determined with unprecedented precision to be 0.974 ± 0.006 ± 0.004, where the first uncertainty is statistical and the second systematic. This result is in agreement with original theoretical predictions based on the heavy quark expansion. Using the current world average of the B-0 lifetime, the Λ0b lifetime is found to be 1.479 ± 0.009 ± 0.010ps.
|Number of pages||9|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Early online date||16 May 2014|
|Publication status||Published - 27 Jun 2014|
ASJC Scopus subject areas
- Nuclear and High Energy Physics