Double parton scattering in pair-production of $J/\psi$ mesons at the LHC revisited

Abstract

Double parton scattering (DPS) is studied at the example of $J/\psi$ pair-production in the LHCb and ATLAS experiments of the Large Hadron Collider (LHC) at centre-of-mass energies of $\sqrt{S}=$ 7, 8, and 13 TeV. We report theoretical predictions delivered to the LHCb and ATLAS collaborations adjusted for the fiducial volumes of the corresponding measurements during Run I and provide new predictions at 13 TeV collision energy. It is shown that DPS can lead to noticeable contributions in the distributions of longitudinal variables of the di-$J/\psi$ system, especially at 13 TeV. The increased DPS rate in double $J/\psi$ production at high energies will open up more possibilities for the separation of single parton scattering (SPS) and DPS contributions in future studies.

22 pages, 10 figures

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• New structures in the J/$\psi$J/$\psi$ mass spectrum in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector
• On the mechanism of $T_{4c}(6900)$ tetraquark production
• Reweighted nuclear PDFs using Heavy-Flavor Production Data at the LHC: nCTEQ15_rwHF & EPPS16_rwHF
• Phenomenological analysis of associated production of $Z^0+b$ in the $b\to J/\psi X$ decay channel at the LHC
• Prospects for quarkonium studies at the high-luminosity LHC
• Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions
• Exclusive and diffractive quarkonium -- pair production at the LHC and FCC
• Photoproduction of the double $J/\psi$ (${\rm Y}$) at the LHC with forward proton tagging
• Prompt $J/\psi$-pair production at the LHC: impact of loop-induced contributions and of the colour-octet mechanism
• Double $J/\psi$ production as a test of parton momentum correlations in double parton scattering
• Di-J/psi production at the Tevatron and the LHC
• Automated event generation for S-wave quarkonium and leptonium production in NRQCD and NRQED