Effective chiral Lagrangian with baryons

We use Ioffe’s method of constructing (local) baryon field operators in terms of quarks to derive an effective chiral Lagrangian with U(3)×U(3) symmetry consisting of the $J^P$ ${=(1/2)\mathrm{}}^{+}$ baryon octet, the $J^P$ ${=(1/2)\mathrm{}}^{\mathrm{-}}$ baryon nonet, and the pseudoscalar-meson nonet. This formalism leads to a set of generalized Goldberger-Treiman relations of the form &∼(${\mathrm{M}}_{\pm }$+${\mathrm{M}}_{\pm }$), & ∼($M_{+}$-$M_{\mathrm{-}}$). We enumerate all nonvanishing three-point & couplings to study the decays $B_{\mathrm{-}}$→$B_{+}$π. We explain why the negative-parity isodoublet N(1535) decays predominantly into Nη, as opposed to Nπ, even though relatively suppressed by phase space.