Observation of the Ξ[subscript b][superscript 0] Baryon
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Makhoul, Khaldoun
Paus, Christoph M. E.
Bauer, Gerry P
Date Issued
August 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Observation of the Ξ_{b}^{0} Baryon.” Physical Review Letters 107.10 (2011). © 2011 American Physical Society
Version
Final published version
Abstract
The observation of the bottom, strange baryon Ξ[subscript b][superscript 0] through the decay chain Ξ[subscript b][superscript 0]→Ξ[subscript c][superscript +]π[superscript -], where Ξ[subscript c][superscript +]→Ξ[superscript -]π[superscript +]π[superscript +], Ξ[superscript -]→Λπ[superscript -], and Λ→pπ[superscript ]-, is reported by using data corresponding to an integrated luminosity of 4.2 fb[superscript -1] from pp̅ collisions at √s=1.96 TeV recorded with the Collider Detector at Fermilab. A signal of 25.3[subscript -5.4][superscript +5.6] candidates is observed whose probability of arising from a background fluctuation is 3.6×10[superscript -12], corresponding to 6.8 Gaussian standard deviations. The Ξ[subscript b][subscript 0] mass is measured to be 5787.8±5.0(stat)±1.3(syst) MeV/c[superscript 2]. In addition, the Ξ[subscript b][superscript -] baryon is observed through the process Ξ[subscript b][subscript -]→Ξ[subscript c][superscript 0]π[superscript -], where Ξ[subscript c][superscript 0]→Ξ[superscript -]π[superscript +], Ξ[superscript -]→Λπ[superscript -], and Λ→pπ[superscript-].
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.107.102001
