Chiral quark model spin filtering mechanism and hyperon polarization
  The model combined with unitarity and impact parameter picture provides simple mechanism for generation of hyperon polarization in collision of unpolarized hadrons. We concentrate on a particular problem of $\Lambda$-hyperon polarization and derive its linear $x_F$-dependence as well as its energy and transverse momentum independence at large $p_\perp$ values. Mechanism responsible for the single--spin asymmetries in pion production is also discussed. 
S.M. Troshin, N.E. Tyurin