# Double quarkonium hadroproduction as a probe of gluon Sivers function

## TL;DR

This paper predicts single spin asymmetry in double J/psi production in proton-proton collisions using non-relativistic QCD and gluon Sivers function, suggesting measurable asymmetries for probing gluon spin effects.

## Contribution

It introduces a prediction of SSA in double J/psi production based on the gluon Sivers function fitted from PHENIX data, incorporating color singlet and octet states.

## Key findings

- Sizable asymmetries estimated as functions of kinematic variables.
- Results suggest SSA can probe gluon Sivers function.
- Uses non-relativistic QCD framework with recent gluon Sivers fit.

## Abstract

The prediction of single spin asymmetry (SSA) in double $\rm J/\psi$ production in proton-proton collision is given out within the framework of non-relativistic QCD, using the recently obtained best fit parameters for the gluon Sivers function extracted from PHENIX data in $\rm p+p^\uparrow\to\pi^0+X$. The color singlet state $\rm ^3 S_1^{(1)}$ and color octet state $\rm ^3 S_1^{(8)}$ are considered to the SSA contribution in the double $\rm J/\psi$ hadroproduction. Our result shows that a sizable asymmetry can be estimated as functions of different kinematic variables.