We have calculated the scattering lengths between the pseudoscalar meson and
charmed triplet, sextet, and excited sextet baryon to the third order with the
heavy baryon chiral perturbation theory. The chiral expansion of the pion
channels converges well.Comment: 14 pages, 1 figure, 4 tables; discussion extended, references added,
  version published in Phys. Rev. D; typos removed from Eqs. (B2, B5, B6, 19),
  erratum corrected in Eq. (B6), tables (I, II, III) update

M. Gong

Shi-Lin Zhu