Measurements of the B[superscript +], B[superscript 0], B[0 over s] meson and Λ[0 over b] baryon lifetimes
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Aaij-2014-Measurements of the.pdf
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1.67 MB
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Author(s)
Counts, Ian Thomas Hunt
Williams, Michael
Ilten, Philip J
Date Issued
April 2014
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, et al. “Measurements of the B[superscript +], B[superscript 0], B[0 over s] meson and Λ[0 over b] baryon lifetimes.” J. High Energ. Phys. 2014, no. 4 (April 2014). © CERN, for the benefit of the LHCb Collaboration
Version
Final published version
Abstract
Measurements of b-hadron lifetimes are reported using pp collision data, corresponding to an integrated luminosity of 1.0 fb[superscript −1], collected by the LHCb detector at a centre-of-mass energy of 7 TeV. Using the exclusive decays B [superscript +] → J/ψK [superscript +], B [superscript 0] → J/ψK [superscript ∗](892)[superscript 0], B[superscript 0] → J/ψK[0 over s], J/ψΛ and B[0 over s] the average decay times in these modes are measured to be [superscript T] B[superscript +] → J/ψK[superscript +] = 1.637 ± 0.004 ± 0.003ps, [superscript T] B[superscript 0] → J/ψK[superscript +0] = 1.524 ± 0.006 ± 0.004ps, [superscript T] B[superscript 0] → J/ψK[0 over s] = 1.499 ± 0.013 ± 0.005ps, [superscript T] Λ[0 over b] → J/ψΛ = 1.415 ± 0.027 ± 0.006ps, [superscript T] B[0 over b] → J/ψφ = 1.480 ± 0.011 ± 0.005ps, 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, ΔΓ [subscript d], to the average width, Γ [subscript d], in the B [superscript 0] system, ΔΓ [subscript d]/Γ [subscript d] = −0.044 ± 0.025 ± 0.011, are reported. All quantities are found to be consistent with Standard Model expectations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/jhep04(2014)114
