Precision Measurement of the Λ[0 over b] Baryon Lifetime
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Author(s)
Williams, Michael
Date Issued
September 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. “Precision Measurement of the Λ_{b}^{0} Baryon Lifetime.” Physical Review Letters 111, no. 10 (September 2013). © 2013 CERN
Version
Final published version
Abstract
The ratio of the Λ[0 over b] baryon lifetime to that of the B̅[superscript 0] meson is measured using 1.0 fb[superscript -1] of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λ[0 over b] baryon is observed for the first time in the decay mode Λ[0 over b]→J/ψpK[superscript -], while the B̅[superscript 0] meson decay used is the well known B̅[superscript 0]→J/ψπ[superscript +]K[superscript -] mode, where the π[superscript +]K[superscript -] mass is consistent with that of the K̅[superscript *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 B̅[superscript 0] meson lifetime, the Λ[0 over b] lifetime is found to be 1.482±0.018±0.012 ps. In both cases, the first uncertainty is statistical and the second systematic.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.102003
