Trigluon correlations and single transverse spin asymmetry in open charm production

TL;DR

This paper investigates how trigluon correlation functions influence single transverse-spin asymmetries in open charm production during SIDIS and proton-proton collisions, proposing methods to extract these functions from experimental data.

Contribution

It introduces a collinear factorization approach to analyze trigluon correlations' impact on asymmetries and estimates their effects in specific experimental settings.

Findings

Asymmetry is sensitive to twist-3 trigluon correlations.

Estimated asymmetries for SIDIS at COMPASS and eRHIC.

Predicted asymmetries for $pp$ collisions at RHIC.

Abstract

We study the single transverse-spin asymmetry for open charm production in the semi-inclusive lepton-hadron deep inelastic scattering (SIDIS) and $pp$ collision. Within collinear factorization approach, we find that the asymmetry is sensitive to the twist-3 trigluon correlation functions in the proton. With a simple model for the trigluon correlation functions, we estimate the asymmetry in SIDIS for both COMPASS and eRHIC kinematics, as well as in $pp$ collision at RHIC energy. We discuss the possibilities of extracting the trigluon correlation functions in these experiments.