Two topics for a discussion on the $b \bar s$ and $b \bar q$ systems
  The analysis of the $b \bar s$ system is an important issue in the Physics programs of the hadron colliders. We discuss two different topics: the structure of the orbitally excited states and prediction of the rates of a class of non leptonic $B_s$ decays. 
P. Colangelo, F. De Fazio, R. Ferrandes