Chiral quark filtering mechanism of hyperon polarization
  The model combined with unitarity and impact parameter picture provide a rather simple mechanism of hyperon polarization generation 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 $p_\perp$. Mechanism responsible for the single--spin asymmetries in pion production is also discussed. 
S. M. Troshin, N. E. Tyurin