@ramonet; @kaiser; @markushin; @juanito; @rios]. One of the consequences of this approach is that the resonances $f_0(500)$, $f_0(980)$, $a_0(980)$ and $\kappa(800)$ are automatically generated from these potentials and the use of the BS equations. In this way these resonances qualify as dynamically generated states, some kind of composite, or molecular, meson meson states, in the same way as the deuteron qualifies as a bound state of a proton and a neutron and not a more exotic object [@Weinberg:1965zz]. The approach not only provides the meson meson amplitudes but has been tested successfully in virtually any reaction where any of the former resonances is produced. The latest test was the study of the $B^0$ and $B^0_s$ decays into $J/\psi f_0(500)$ and $J/\psi f_0(980)$ which was done in Ref. [@weihong] (a list of different reactions where the former resonances are produced can also be found there), where a natural explanation was given of the observed facts that the $\bar{B}^0_s$ decays into $J/\psi f_0(980)$, while no signal is seen for $J/\psi f_0(500)$, and the $\bar{B}^0$ decays into $J/\psi
f_0(500)$ and only a small fraction is seen for the $J/\psi
f_0(980)$.

The $D^0$ decay into $K^0_s$ and a scalar resonance, $f_0(500)$, $f_0(980)$, $a_0(980)$ is 