Abstract

A highly significant structure is observed in the Λc+K-π+π+ mass spectrum, where the Λc+ 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 Ξcc++. The difference between the masses of the Ξcc++ and Λc+ states is measured to be 1334.94±0.72(stat.)±0.27(syst.) MeV/c2, and the Ξcc++ mass is then determined to be 3621.40±0.72(stat.)±0.27(syst.)±0.14(Λc+) MeV/c2, where the last uncertainty is due to the limited knowledge of the Λc+ 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
Number of pages10
JournalPhysical Review Letters
Volume119
Issue number11
DOIs
Publication statusPublished - 11 Sep 2017

Keywords

  • B-C MESONS
  • HEAVY BARYONS
  • HADRONIC PRODUCTION
  • MONTE-CARLO
  • DECAY
  • SPECTROSCOPY
  • MASSES
  • GENERATOR
  • GENXICC
  • VERSION

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