First observation of the doubly charmed baryon decay ${\Xi }_{cc}^{++}\to {\Xi }_c^{+}{\pi }^{+}$

Abstract

The doubly charmed baryon decay ${\Xi }_{cc}^{++}\to {\Xi }_c^{+}{\pi }^{+}$ is observed for the first time, with a statistical significance of $5.9\sigma$, confirming a recent observation of the baryon in the ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}{\pi }^{+}$ final state. The data sample used corresponds to an integrated luminosity of $1.7{\mathrm{fb}}^{-1}$, collected by the LHCb experiment in $pp$ collisions at a center-of-mass energy of $13\mathrm{Te}\mathrm{V}$. The ${\Xi }_{cc}^{++}$ mass is measured to be \begin{equation}\nonumber 3620.6\pm 1.5~(\text{stat})\pm 0.4~(\text{syst}) \pm 0.3~(Ξ_{c}^{+})~\text{MeV}/\it{c}^{2}, \end{equation} and is consistent with the previous result. The ratio of branching fractions between the decay modes is measured to be \begin{equation}\nonumber \frac{\mathcal{B} (Ξ_{cc}^{++} \rightarrow Ξ_{c}^{+} π^{+}) \times \mathcal{B}(Ξ_{c}^{+} \rightarrow pK^{-}π^{+})} {\mathcal{B} (Ξ_{cc}^{++} \rightarrow Λ_c^{+} K^{-} π^{+} π^{+}) \times \mathcal{B}(Λ_c^{+} \rightarrow pK^{-}π^{+})} = 0.035\pm 0.009~(\text{stat}) \pm 0.003~(\text{syst}). \end{equation}

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-026.html

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