Observation of the doubly charmed baryon ${\Xi }_{cc}^{++}$

Abstract

A highly significant structure is observed in the ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}{\pi }^{+}$ mass spectrum, where the ${\Lambda }_c^{+}$ baryon is reconstructed in the decay mode $p{K}^{-}{\pi }^{+}$. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon ${\Xi }_{cc}^{++}$. The difference between the masses of the ${\Xi }_{cc}^{++}$ and ${\Lambda }_c^{+}$ states is measured to be $1334.94\pm 0.72(\mathrm{stat})\pm 0.27(\mathrm{syst}\mathrm{MeV}/c^2$, and the ${\Xi }_{cc}^{++}$ mass is then determined to be $3621.40\pm 0.72(\mathrm{stat})\pm 0.27(\mathrm{syst}\pm 0.14({\Lambda }_c^{+})\mathrm{MeV}/c^2$, where the last uncertainty is due to the limited knowledge of the ${\Lambda }_c^{+}$ 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 ${\mathrm{fb}}^{-1}$, and confirmed in an additional sample of data collected at 8 TeV.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-018.html

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