# Triple prompt $J/\psi$ hadroproduction as a hard probe of multiple-parton scatterings

## TL;DR

This paper investigates triple prompt $J/\psi$ hadroproduction as a clean and effective way to probe multiple-parton scatterings, especially triple-parton scattering, at high-energy colliders, providing predictions and measurement feasibility.

## Contribution

It offers the first complete coherent study of single-, double-, and triple-parton scatterings in triple $J/\psi$ production, highlighting its potential to explore triple-parton correlations.

## Key findings

- Triple $J/\psi$ production is a promising probe for multiple-parton scatterings.
- Single-parton scattering is strongly suppressed in this process.
- Measurement is feasible with existing LHC data.

## Abstract

We propose that the process of triple prompt $J/\psi$ hadroproduction is a very clean hard probe of multiple-parton scatterings at high-energy hadron colliders, especially the least known triple-parton scattering. A first complete study is carried out by considering single-, double-, and triple-parton scatterings coherently. Our calculation shows that it is a golden channel to probe double- and triple-parton scatterings, as the single-parton scattering is strongly suppressed. The predictions of the (differential) cross sections in proton-proton collisions at the LHC and the future higher-energy hadron colliders are given. Our study shows that its measurement is already feasible with the existing data collected during the period of the LHC run 2. A method is proposed to extract the triple-parton scattering contribution, and therefore it paves a way to study the possible triple-parton correlations in a proton.