Observation of a New Ξ[superscript −][subscript b] Resonance
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PhysRevLett.121.072002.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Aidala, C. A.
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alexander, M.
Date Issued
August 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., et al. “Observation of a New Ξ[subscript b][superscript −] Resonance.” Physical Review Letters, vol. 121, no. 7, Aug. 2018. © 2018 CERN for the LHCb Collaboration
Version
Final published version
Abstract
From samples of pp collision data collected by the LHCb experiment at √s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and
1.5 fb[superscript −1], respectively, a peak in both the Λ[superscript 0][subscript b]K[superscript −] and Ξ[superscript 0][subscript b]π[superscript −] invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξ[superscript −][subscript b] resonances with quark content
bds are expected. Referring to this peak as Ξ[subscript b](6227)[superscript −], the mass and natural width are measured to be m[subscript Ξ
[subscript b]](6227)[superscript −] = 6226.9 ± 2.0 ± 0.3 ± 0.2 MeV/c[superscript 2] and Γ[subscript Ξ[subscript b]](6227)[superscript −] =
18.1 ± 5.4 ± 1.8 MeV/c[superscript 2], where the first uncertainty is statistical, the second is systematic, and the third, on m[subscript Ξ[subscript b]](6227)
[superscript −], is due to the knowledge of the Λ[superscript 0][subscript
b] baryon mass. Relative production rates of the Ξ[subscript b](6227)[superscript −] → Λ[superscript 0][subscript b]K[superscript −] and Ξ[subscript b](6227)[superscript −] → Ξ[superscript 0][subscript b]π[superscript −] decays are also reported.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.121.072002
