Single spin asymmetries in transversely polarized proton(antiproton) - proton inclusive processes

TL;DR

This paper investigates single spin asymmetries in inclusive proton and antiproton interactions with protons, using higher twist QCD effects and transverse momentum considerations, providing predictions aligned with existing data and proposing new measurements.

Contribution

It extends previous QCD-based models to new processes, offering predictions that match experimental results and guiding future experiments.

Findings

Predictions agree with existing experimental data.

Identifies the role of higher twist effects and transverse momentum in asymmetries.

Suggests new measurements for further validation.

Abstract

We consider several single spin asymmetries in inclusive, transversely polarized proton(antiproton) - proton processes as higher twist QCD contributions, taking into account spin and intrinsic transverse momentum effects in the quark distribution functions. This approach has been previously applied to the description of the single spin asymmetries observed in transversely polarized proton - proton -> pion + X reactions and all its parameters fixed: we give here predictions for new processes, which agree with experiments for which data are available, and suggest further possible measurements.