Speaker
Description
In the last years there has been interesting physics around the thresholds of a charmed meson and a strange one. The firsts of these states discovered were the $D_{s0}(2317)$, near the $DK$ threshold and the $D_{s1}(2460)$, close to the $D^*K$ mass. Recently, the LHCb has reported several states which are near the $D^*K^*$ energy region. These are the $T_{cs}(2900)$ and $T_{c\bar{s}}(2900)$. We recall the predictions made on these states from the hidden gauge approach. Several reactions are proposed in order to look for the spin partners of the $T_{cs}(2900)$. We also study the reactions $B^0\to\bar{D}^0D_s^+\pi^-$ and $B^+\to D^-D_s^+\pi^+$ where the $T_{c\bar{s}}(2900)$ has been seen. Our study suggest that this new state is indeed a threshold effect formed by the $D^*K^*$, $D^*_s\rho$ interaction. Finally, we also show results of a recent lattice data analysis of $DK$ scattering in the HM$\chi$PT framework, from where the quark mass dependence of the $D_{s0}(2317)$ has been extracted.
