Polarization at high transverse momentum through weak interaction and its interference with strong interaction

At transverse momenta of typical 20 to 40 GeV/c the hard scattering of quarks leads to partially polarized jets. The responsable mechanisms areW ^± andZ ⁰ exchange and their interference with gluon exchange. For the jet fragmentation we employ a model with favoured and disfavoured fragmentation according to broken SU (6). For vector mesons and Λ particles a modest polarization is predicted of the order up to ～8%.