A simple explanation of hyperon polarization at high pt

We present the first truly dynamical calculation of the single transverse-spin asymmetry for the process pN --> B(up) + X, where B is LAMBDA0 or SIGMA0,+/- observed at large angles. After showing that the trip le-Regge model gives a good representation of the inclusive unpolarized cross sections, the polarization is calculated by considering the hyperon to emerge in the final state either directly or as the result of virtual dissociation of a parent baryon. Our results reproduce very well both the measured p(T) and x(F) dependence of the hyperon polarization.