Precision measurement of the ratio of the Λ b 0 to B ¯ 0 lifetimes
DownloadPublished version (635.5Kb)
Publisher with Creative Commons License
Publisher with Creative Commons License
Creative Commons Attribution
Terms of use
Metadata
Show full item recordAbstract
The LHCb measurement of the lifetime ratio of the Λb0 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 Λb0→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 Λb0 lifetime is found to be 1.479 ± 0.009 ± 0.010ps. © 2014 The Authors.
Date issued
2014-05Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher
Elsevier BV
Citation
Aaij, R., et al. "Precision Measurement of the Ratio of the ?b0 to B-0 Lifetimes." Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 734 (2014): 122-30.
Version: Final published version
ISSN
0370-2693