Search for the charmonium weak decays $$ J/\psi \to {D}_s^{-}{\rho}^{+}+\textrm{c}.\textrm{c}. $$ and $$ J/\psi \to {D}_s^{-}{\pi}^{+}+\textrm{c}.\textrm{c}. $$

A bstract Based on (10087 ± 44) × 10 6 J / ψ events recorded with the BESIII detector, we search for the rare charmonium weak decays $$ J/\psi \to {D}_s^{-}{\rho}^{+}+\textrm{c}.\textrm{c}. $$ J / ψ → D s − ρ + + c . c . and $$ J/\psi \to {D}_s^{-}{\pi}^{+}+\textrm{c}.\textrm{c}. $$ J / ψ → D s − π + + c . c . No signal is observed, and upper limits on the branching fractions at the 90% confidence level are set as $$ \mathcal{B}\left(J/\psi \to {D}_s^{-}{\rho}^{+}+\textrm{c}.\textrm{c}.\right)<8.0\times {10}^{-7} $$ B J / ψ → D s − ρ + + c . c . < 8.0 × 10 − 7 and $$ \mathcal{B}\left(J/\psi \to {D}_s^{-}{\pi}^{+}+\textrm{c}.\textrm{c}.\right)<4.1\times {10}^{-7} $$ B J / ψ → D s − π + + c . c . < 4.1 × 10 − 7 . Our results provide the most stringent experimental constraints on these decays.

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