Spin Polarization of Hyperons in the Hadron-Hadron Inclusive Collisions - Mechanisms and Dynamics -

We discuss interplay of the scalar and vector diquarks which decide the characteristics of the spin polarization as functions of $p_T$ and $x_F$ in the wide kinematical range. We demonstrate a significant effect of quark masses on the pair-creation probabilities from vacuum in $pp \to \Sigma^- X$ and $\gamma p \to \Lambda X$ collisions, and also a remarkable correction induced by the diquark form factor in $ \Sigma^- p \to \Lambda X $ collision.

K.-I. Kubo, K. Suzuki · 2005