Triple prompt $J/ψ$ hadroproduction as a hard probe of multiple-parton scatterings

TL;DR

It is proposed that the process of triple prompt J/ψ hadroproduction is a very clean hard probe of multiple-parton scatterings at high-energy hadron colliders, especially the least known triple- parton scattering, and a method is proposed to extract the triple-Parton scattering contribution.

Abstract

We propose that the process of triple prompt $J/ψ$ 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.

Figures (3)

• Figure 1: Typical Feynman diagrams for triple $J/\psi$ hadroproduction via (a) SPS, (b) DPS and (c) TPS processes.
• Figure 2: Cross section $\sigma(pp\rightarrow 3J/\psi)\times{\rm Br}^3(J/\psi\rightarrow \mu^+\mu^-)$ (in femtobarn) dependence of the minimal transverse momentum cut $P_T>P_{\rm T, min}$ among three $J/\psi$'s at $\sqrt{s}=13$ TeV and within the rapidity interval $|y_{J/\psi}|<2.4$. The horizontal dashed lines are the expected 100 events under targeted integrated luminosities.
• Figure 3: Cross section $\sigma(pp\rightarrow 3J/\psi)\times{\rm Br}^3(J/\psi\rightarrow \mu^+\mu^-)$ (in femtobarn) dependence of the minimal rapidity gap cut $|\Delta y|>|\Delta y|_{\rm min}$ among three $J/\psi$'s at $\sqrt{s}=13$ TeV. The horizontal dashed lines are the expected 100 events under targeted integrated luminosities.