# Process dependence of the gluon Sivers function in inclusive $pp$ collisions: theory

## TL;DR

This paper calculates transverse single-spin asymmetries in inclusive proton-proton collisions for various particles using the CGI-GPM framework, highlighting the process dependence of the gluon Sivers function at leading order.

## Contribution

It provides the first complete leading-order results for these asymmetries within the CGI-GPM, incorporating initial and final state interactions.

## Key findings

- Results show process dependence of the gluon Sivers function.
- Provides predictions for asymmetries in $J/\psi$, $D$ mesons, pions, and photons.
- Highlights the importance of initial and final state interactions.

## Abstract

Within the color gauge invariant generalized parton model (CGI-GPM), which includes initial and final state interactions in a transverse momentum dependent formalism, we present the complete results, at leading order in perturbative QCD, for transverse single-spin asymmetries in the inclusive hadroproduction of $J/\psi$ and $D$ mesons, pions and direct photons.