Observation of the Doubly Charmed Baryon Ξ[superscript ++][subscript cc]
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PhysRevLett.119.112001.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
September 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., et al. “Observation of the Doubly Charmed Baryon Ξ[subscript cc][superscript + +].” Physical Review Letters, vol. 119, no. 11, Sept. 2017. © 2017 CERN for the LHCb Collaboration
Version
Final published version
Abstract
A highly significant structure is observed in the Λ[subscript c][superscript
+]K[superscript -]π[superscript +]π[superscript +] mass spectrum, where the Λ[subscript c][superscript +] baryon is reconstructed in the decay mode pK[superscript -]π[superscript +]. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξ[subscript cc][superscript ++]. The difference between the masses of the Ξ[subscript cc][superscript ++] and Λ[subscript c][superscript +] states is measured to be 1334.94 ± 0.72(stat.) ± 0.27(syst.) MeV/c[superscript 2], and the Ξ[subscript cc][superscript ++] mass is then determined to be 3621.40±0.72(stat.) ± 0.27(syst.) ± 0.14(Λ[subscript c][superscript +]) MeV/c[superscript 2], where the last uncertainty is due to the limited knowledge of the Λ[subscript c][subscript +] mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 fb[superscript -1], and confirmed in an additional sample of data collected at 8 TeV.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.119.112001
