  We study baryon resonances with heavy flavor in a molecular approach, thus as
dynamically generated by baryon-meson scattering. This is accomplished by using
a unitary coupled-channel model taking, as bare interaction, the extension of
the Weinberg-Tomozawa SU(3) Lagrangian. A special attention is payed to the
inclusion of heavy-quark spin symmetry and to the study of the generated baryon
resonances that complete the heavy-quark spin multiplets. Our model reproduces
the \Lambda_b(5912) and \Lambda_b(5920) baryons, which were recently observed
by the LHCb collaboration. According to our analysis, these two states are
heavy-quark spin symmetric partners. We also make predictions for few \Xi_b
baryon resonances, which belong to the same SU(3)xHQSS multiplets as the
\Lambda_b particles.
