The Pseudoscalar Meson and Heavy Vector Meson Scattering Lengths
  We have systematically studied the S-wave pseudoscalar meson and heavy vector meson scattering lengths to the third order with the chiral perturbation theory, which will be helpful to reveal their strong interaction. For comparison, we have presented the numerical results of the scattering lengths (1) in the framework of the heavy meson chiral perturbation theory and (2) in the framework of the infrared regularization. The chiral expansion converges well in some channels. 
Zhan-Wei Liu, Yan-Rui Liu, Xiang Liu, Shi-Lin Zhu
hep-ph