# Photoproduction of the double $J/\psi$ ($\Upsilon$) at the LHC with forward proton tagging

## TL;DR

This paper calculates the production rates of double $J/\psi$ and $\Upsilon$ particles via photon interactions at the LHC, highlighting potential detection prospects and their implications for understanding heavy quarkonium production mechanisms.

## Contribution

It provides the first leading-order calculations of double $J/\psi$ and $\Upsilon$ photoproduction at the LHC with forward proton tagging, including cross section estimates for various detector acceptances.

## Key findings

- Double $J/\psi$ production cross section can reach about 1.37 pb with certain detector acceptances.
- Total cross section for double $J/\psi$ is less than 200 fb in some acceptance ranges.
- Double $\Upsilon$ production cross section is predicted to be less than 10 fb.

## Abstract

We calculate the photoproduction of double $J/\psi$ ($\Upsilon$) to leading order based on the nonrelativistic quantum chromodynamics factorization framework at the Large Hadron Collider with forward proton tagging. The numerical results of double $J/\psi$ photoproduction pp $\rightarrow$ p$\gamma$p $\rightarrow$ $J/\psi$ + $J/\psi$ with different forward detector acceptances ($\xi$) are presented. The total cross section of double $J/\psi$ photoproduction is less than 200 fb with 0.1 $<$ $\xi$ $<$ 0.5, but can reach about 1.37(1.27) pb with 0.0015 $<$ $\xi$ $<$ 0.5 ( 0.0015 $<$ $\xi$ $<$ 0.15 ). The double $J/\psi$ photoproduction may have the potential to be detected and provide an interesting signature, thus is useful for studying the mechanism of heavy quarkonium production. We also predict the double $\Upsilon$ photoproduction and find they are, unfortunately, small (with less than 10 fb).