Observation of the Doubly Charmed Baryon Ξ[subscript cc]⁺⁺
Author(s)Boettcher, Tara L.; Craik, Daniel C; Ilten, Philip J; Williams, Michael; LHCB Collaboration
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A highly significant structure is observed in the Λ[subscript c]⁺K⁻π⁺π⁺ mass spectrum, where the Λ[subscript c]⁺ baryon is reconstructed in the decay mode pK-π⁺. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξ[subscript cc]⁺⁺. The difference between the masses of the Ξ[subscript cc]⁺⁺ and Λc⁺ states is measured to be 1334.94±0.72(stat.)±0.27(syst.) MeV/c², and the Ξ[subscript cc]⁺⁺ mass is then determined to be 3621.40±0.72(stat.)±0.27(syst.)±0.14(Λ[subscript c]⁺) MeV/c², where the last uncertainty is due to the limited knowledge of the Λ[subscript c]⁺ 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⁻¹, and confirmed in an additional sample of data collected at 8 TeV.
DepartmentLincoln Laboratory; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society (APS)
Aaij, R. et al. “Observation of the Doubly Charmed Baryon Ξ[subscript cc]⁺⁺.” Physical Review Letters 119, 11 (September 2017): 112001 © 2017 CERN, for the LHCb Collaboration.
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