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A coupled-channels analysis, based on the K-matrix approach, is presented for photo-induced kaon production. It is shown that channel coupling effects are large and should not be ignored. The importance of contact terms in the analysis, associated with short-range correlations, is pointed out. The extracted parameters are compared with SU(3) model predictions.

The shift of the p-wave D s meson mass due to coupling to the D K channel is calculated using a QCD string model and the chiral Lagrangian. As a result the original Q¯q mass, 2.490 MeV, generically calculated in the relativistic quark models is shifted down to the experimental value 2317 MeV. With the same Lagrangian the shift of the radial excited 1− level is much smaller, while the total width Γ>100 MeV and the width ratio is in contradiction with the D∗(2632) state observed by SELEX Collaboration.