Hyperon Polarization in Unpolarized Scattering Processes

TL;DR

This paper investigates hyperon polarization in unpolarized scattering processes using a twist-three approach, comparing it with TMD factorization, and finds consistent results in certain momentum regions with specific contributions identified.

Contribution

It introduces a twist-three framework for hyperon polarization and compares it with TMD factorization, highlighting the role of derivative terms in pp collisions.

Findings

Consistency between twist-three and TMD approaches in intermediate transverse momentum.

In pp collisions, only derivative terms contribute to hyperon polarization.

Non-derivative terms vanish in the studied processes.

Abstract

Transverse polarization in the Hyperon production in the unpolarized deep inelastic scattering and pp collisions is studied in the twist-three approach, considering the contribution from the quark-gluon-antiquark correlation distribution in nucleon. We further compare our results for deep inelastic scattering to a transverse momentum dependent factorization approach, and find consistency between the two approaches in the intermediate transverse momentum region. We also find that in pp collisions, there are only derivative terms contributions, and the non-derivative terms vanish.