Study of the decays ψ(3686)→γχcJ→γp¯K*+Λ+c.c. and ψ(3686)→p¯K*+Λ+c.c.

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Abstract

Based on the data sample of $448.1\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(3686)$ events collected with the BESIII detector at BEPCII, we present a study of the decays $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}\ensuremath{\gamma}\overline{p}{K}^{*+}\mathrm{\ensuremath{\Lambda}}+\mathrm{c}.\mathrm{c}.$ and $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\overline{p}{K}^{*+}\mathrm{\ensuremath{\Lambda}}+\mathrm{c}.\mathrm{c}$. The branching fractions of ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}\overline{p}{K}^{*+}\mathrm{\ensuremath{\Lambda}}+\mathrm{c}.\mathrm{c}.$ ($J=0$, 1, 2) are measured to be $(4.8\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, $(5.0\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, and $(8.2\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, respectively, where the first uncertainties are statistical and the second systematic. The branching fraction of $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\overline{p}{K}^{*+}\mathrm{\ensuremath{\Lambda}}+\mathrm{c}.\mathrm{c}.$ is measured to be $(6.3\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$. All these decay modes are observed for the first time.

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