Single spin asymmetries in inclusive hadron production from SIDIS to hadronic collisions: universality and phenomenology

TL;DR

This paper uses a perturbative QCD framework incorporating spin and transverse momentum effects to connect azimuthal asymmetries in various processes, predicting single spin asymmetries in polarized proton collisions that agree with RHIC data.

Contribution

It demonstrates the universality of Sivers, transversity, and Collins functions across different processes and successfully predicts single spin asymmetries in hadronic collisions.

Findings

Predicted single spin asymmetries match RHIC experimental data.

Established universality of soft functions across processes.

Connected azimuthal asymmetries in SIDIS, e+ e- annihilations, and hadronic collisions.

Abstract

In a perturbative QCD approach, with inclusion of spin and transverse momentum effects, experimental data on azimuthal asymmetries observed in polarized semi-inclusive deeply inelastic scattering and e+ e- annihilations can be used to determine the Sivers, transversity and Collins soft functions. By using these functions, within the same scheme, we predict p(transv. polarized) p -> h + X single spin asymmetries in remarkable agreement with RHIC experimental data.