Observation of the Doubly Charmed Baryon Ξc c + + 

Robert Appleby, Igor Babuschkin, Roger Barlow, William Barter, Alexander Bitadze, Silvia Borghi, Christopher Burr, Lorenzo Capriotti, Shun Chen, Evelina Gersabeck, Marco Gersabeck, Jonathan Harrison, Suzanne Klaver, Andrew Mcnab, Christopher Parkes, Pablo Rodriguez Perez, Gediminas Sarpis, Mark Williams, LHCb Collaboration

    Research output: Contribution to journalArticlepeer-review


    A highly significant structure is observed in the Λ+cK−π+π+ mass spectrum, where the Λ+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++cc. The difference between the masses of the Ξ++cc and Λ+c states is measured to be 1334.94±0.72(stat.)±0.27(syst.)MeV/c2, and the Ξ++cc mass is then determined to be 3621.40 ±0.72(stat.)±0.27(syst.)±0.14(Λ+c)  MeV/c2, where the last uncertainty is due to the limited knowledge of the Λ+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.
    Original languageEnglish
    Article number112001
    JournalPhysical Review Letters
    Publication statusPublished - 11 Sept 2017


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