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Observation of the Ξ[subscript b][superscript 0] Baryon

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, Khaldoun; Paus, Christoph M. E.; Bauer, Gerry P
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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-].
Date issued
2011-08
URI
http://hdl.handle.net/1721.1/71187
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
0031-9007
1079-7114

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