Dynamically generated 0+ heavy mesons in a heavy chiral unitary approach

In terms of the heavy chiral Lagrangian and the unitarized coupled-channel scattering amplitude, interaction between the heavy meson and the light pseudoscalar meson is studied. By looking for the pole of scattering matrix on an appropriate Riemann sheet, a DK bound state Ds0∗ with the mass of 2.312±0.041GeV is found. This state can be associated as the narrow DsJ∗(2317) state found recently. In the same way, a BK¯ bound state Bs0∗ is found, and its mass of 5.725±0.039GeV is predicted. The spectra of D0∗ and B0∗ with I=1/2 are further investigated. One broad and one narrow states are predicted in both charm and bottom sectors. The coupling constants and decay widths of the predicted states are also calculated.