Baryon resonances in a constituent quark model

The role of pseudoscalar mesons in the dynamical properties of baryon reson ances is examined by means of the constituent quark model with meson-quark coupling. Since resonance properties are closely related to meson-baryon sc atterings, it is important to include reaction processes as well as mass sp ectra in the analysis. The isobar model is employed to properly extract inf ormation of baryon resonances from reaction amplitudes. Prominent features of resonance spectra are reproduced fairly well by taking account of baryon self-energies due to meson-quark coupling. Several problems remained in th e static quark model of baryons, e.g. Lambda(1405)-Lambda(1520) mass differ ence, are also studied. Brief comments on some improvements of the present model are given.