Single transverse-spin asymmetry for $D$-meson production in semi-inclusive deep inelastic scattering

TL;DR

This paper investigates the single transverse-spin asymmetry in D-meson production during semi-inclusive deep inelastic scattering, linking it to the twist-three tri-gluon correlation function and exploring experimental extraction possibilities.

Contribution

It introduces a calculation of the asymmetry based on collinear factorization and models the tri-gluon correlation function to estimate asymmetries at experimental facilities.

Findings

Asymmetry is proportional to the twist-three tri-gluon correlation function.

Estimated asymmetries for COMPASS and eRHIC kinematics.

Potential to extract tri-gluon correlation functions from experimental data.

Abstract

We study the single-transverse spin asymmetry for open charm production in the semi-inclusive lepton-hadron deep inelastic scattering. We calculate the asymmetry in terms of the QCD collinear factorization approach for $D$ mesons at high enough $P_{h\perp}$, and find that the asymmetry is proportional to the twist-three tri-gluon correlation function in the proton. With a simple model for the tri-gluon correlation function, we estimate the asymmetry for both COMPASS and eRHIC kinematics, and discuss the possibilities of extracting the tri-gluon correlation function in these experiments.