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We study the transverse polarization of hyperons produced in high-energy unpolarized protonproton collisions in the framework of the collinear factorization. This phenomenon is a twist-3 observable which receives contributions from a twist-3 distribution and a twist-3 fragmentation function. We focus on the former contribution and derive the corresponding leading-order cross section. For the soft-gluon-pole contribution, we develop the “master formula" which reduces the partonic cross section to a certain 2 → 2 parton scattering cross section and thus simplifies the calculation greatly. We also calculate the soft-fermion-pole contribution for the first time and show that it vanishes in all channels.

Twist-3 approach to hyperon polarization in unpolarized proton-proton collision