New heavy mesons as hadronic molecules

We discuss a possible interpretation of the D s 0 ∗ ( 2317 ) , D s 1 ( 2460 ) , B s 0 ∗ ( 5725 ) and B s 1 ( 5778 ) mesons as hadronic molecules. Using an effective Lagrangian approach we calculate their weak, strong and radiative decays. The new impact of the molecular structure of these states is the presence of u ( d ) quarks in the K , D ( ∗ ) and B ( ∗ ) mesons which gives rise to the direct strong isospin-violating transitions D s 0 ∗ ( B s 0 ∗ ) → D s ( B s ) + π 0 and D s 1 ( B s 1 ) → D s ∗ ( B s ∗ ) + π 0 in addition to the modes generated by η − π 0 mixing as was considered before in the literature.