Strong decays of heavy-light mesons in a chiral quark model

We carry out a systematic study of the heavy-light meson strong decays in a chiral quark model. For the S-wave vectors [D*(2007), D^*±(2010)], P-wave scalars [D₀*(2400), B₀*(5730)], and tensors [D₂*(2460), Dₛ₂*(2573)], we obtain results in good agreement with the experimental data. For the axial vectors D₁(2420) and D₁^'(2430), a state mixing scheme between 1¹P₁ and 1³P₁ is favored with a mixing angle φ-(55±5)^∘, which is consistent with previous theoretical predictions. The same mixing scheme also applies to Dₛ₁(2460) and Dₛ₁(2536) that accounts for the narrow width of the Dₛ₁(2536) and its dominant decay into D*K. For B₁(5725) and B₁^'(5732), such a mixing explains well the decay width of the former but leads to an even broader B₁^'(5732). Predictions for the strange-bottom axial vectors are also made. For the undetermined meson D*(2640), we find that they fit well in the radially excited state 2³S₁ according to its decay mode. The newly observed DsJ*(2860) strongly favors the D-wave excited state 1³D₃. For DsJ*(2632) and DsJ*(2690), we find they are difficult to fit in any Dₛ excitations in that mass region, if the experimental data are accurate. Theoretical predictions for decay modes of those unobserved states as multiplets of $2S$ and $1D$ waves are also presented, which should be useful for the further experimental search for those states.