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Measurements of the B[superscript +], B[superscript 0], B[0 over s] meson and Λ[0 over b] baryon lifetimes

Author(s)
Counts, Ian Thomas Hunt; Williams, Michael; Ilten, Philip J
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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.
Date issued
2014-04
URI
http://hdl.handle.net/1721.1/88607
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
1029-8479
1126-6708

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