Observation of Bc+→J/ψD(*)K(*) decays

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Abstract

A search for the decays ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{(*)0}{K}^{+}$ and ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{(*)+}{K}^{*0}$ is performed with data collected at the LHCb experiment corresponding to an integrated luminosity of $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The decays ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{0}{K}^{+}$ and ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{*0}{K}^{+}$ are observed for the first time, while first evidence is reported for the ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{*+}{K}^{*0}$ and ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{+}{K}^{*0}$ decays. The branching fractions of these decays are determined relative to the ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}$ decay. The ${B}_{c}^{+}$ mass is measured, using the $J/\ensuremath{\psi}{D}^{0}{K}^{+}$ final state, to be $6274.28\ifmmode\pm\else\textpm\fi{}1.40(\text{stat})\ifmmode\pm\else\textpm\fi{}0.32(\text{syst})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. This is the most precise single measurement of the ${B}_{c}^{+}$ mass to date.

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