Measurement of the mass and lifetime of the Ω[superscript −][subscript b] baryon
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PhysRevD.93.092007.pdf
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Author(s)
Aaij, R.
Abellán Beteta, C.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Alternative Title
Measurement of the mass and lifetime of the Ω− b baryon
Date Issued
May 2016
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaij, R. et al. “Measurement of the Mass and Lifetime of the Ω[superscript −][subscript b] Baryon.” Physical Review D 93.9 (2016): n. pag. © 2016 CERN for the LHCb Collaboration
Version
Final published version
Abstract
A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb[superscript -1] collected by LHCb at √s=7 and 8 TeV, is used to reconstruct 63±9 Ω[superscript -][subscript b]→Ω[superscript 0][subscript c]π[superscript -], Ω[superscript 0][subscript c]→pK[superscript -]K[superscript -]π[superscript +] decays. Using the Ξ[superscript -][subscript b]→Ξ[superscript 0][subscript c]π[superscript -], Ξ[superscript 0][subscript c]→pK[superscript -]K[superscript -]π[superscript +] decay mode for calibration, the lifetime ratio and the absolute lifetime of the Ω[superscript -][subscript b] baryon are measured to be τ[subscript Ω[superscript -][subscript b]/τ[subscript Ξ[superscript -][subscript b-]]=1.11±0.16±0.03, τ[subscript Ω[superscript -][subscript b]]=1.78±0.26±0.05±0.06 ps, where the uncertainties are statistical, systematic and from the calibration mode (for τ[subscript Ω[superscript -][subscript b]] only). A measurement is also made of the mass difference, m[subscript Ω[superscript -][subscript b]]-m[subscript Ξ[superscript -][subscript b]], and the corresponding Ω[superscript -][subscript b] mass, which yields m[subscript Ω[superscript -][subscript b]]-m[subscript Ξ[superscript -][subscript b]]=247.4±3.2±0.5 MeV/c[superscript 2], m[subscript Ω[superscript -][subscript b]]=6045.1±3.2±0.5±0.6 MeV/c[superscript 2].. These results are consistent with previous measurements.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevD.93.092007
