Evidence for two-quark content off0(980)in exclusiveb→cdecays

Inspired by a large decay branching ratio (BR) of $B^{+}\to f_0{\mathrm{}\left(980\right)K}^{+}$ measured by Belle recently, we propose that significant evidence of the component of $n\mathrm{n̄}=(uū+d\overline{d})/\sqrt{2}$ in $f_0\mathrm{}\left(980\right)\mathrm{}$ could be demonstrated in exclusive $\overrightarrow{b}c$ decays by the observation of $f_0\mathrm{}\left(980\right)\mathrm{}$ in the final states $\overline{B}\to D^{0\left(*\right)}{\pi }^{+}{\pi }^{-}\mathrm{}\left(\mathrm{KK}\right)\mathrm{}$ and $\overline{B}\to J/\psi {\pi }^{+}{\pi }^{-}\mathrm{}\left(\mathrm{KK}\right).$ We predict the BRs of $\overline{B}\to D^{0\left(*\right)}(J/\psi {)f}_0\mathrm{}(980)\mathrm{}$ to be $\mathcal{O}{(10\mathrm{}}^{-4})$ $\left[\mathcal{O}{(10\mathrm{}}^{-5}\right)]$ while the unknown wave functions of $D^{\left(*\right)0\mathrm{}}$ $(J/\psi )$ are chosen to fit the observed decays of $\overline{B}\to D^{\left(*\right)0\mathrm{}}{\pi }^0$ $(J/\psi K^{0\left(*\right)}).\mathrm{}$