First study of polarized proton-proton scattering with small-x helicity evolution

Key Points

• The study shows that small-x polarized proton-proton scattering data significantly reduce uncertainties in helicity PDFs.
• Using jet production data at parton momentum fractions x < 0.1 led to the finding that total quark and gluon helicity is -0.04 ± 0.23.
• Incorporating double-longitudinal spin asymmetries in deep-inelastic scattering improves the analysis of helicity contributions.
• This approach highlights the impact of combining diverse datasets on the understanding of helicity in proton structure.