Production of $J/\psi +{\chi }_c$ and $J/\psi +J/\psi$ with real gluon emission at LHC

Abstract

In the present work we study production of $J/\psi +{\chi }_c$ and $J/\psi +J/\psi$ in LHC. The first process is forbidden at the leading order in gluon fusion due to the $C$-parity conservation, and the first non-vanishing contribution is given by the process with additional emission of real gluon. Considering the direct production of $J/\psi +J/\psi$, where the leading order is allowed, we have found that the contribution from the higher order process with real gluon emission is comparable and even more significant than the leading order. Moreover, account of this higher order effect dramatically changes kinematical distributions. Through the present paper we study in details different channels of paired $J/\psi +J/\psi$ production: direct $J/\psi +J/\psi$ production, feed-down from $J/\psi +{\chi }_c$ channel, double parton scattering. We also try to find kinematical distributions that are most suitable to separate these different channels.

minor changes, some references added

References in corpus (9)

• New parton distributions for collider physics
• Upsilon production at the Tevatron and the LHC
• Measurement of prompt J/psi pair production in pp collisions at sqrt(s) = 7 TeV
• Inclusive double-quarkonium production at the Large Hadron Collider
• Pair Production of Heavy Quarkonium and $B_c{(}^{\ast })$ Mesons at Hadron Colliders
• Production of ${\chi }_b$-mesons at LHC
• Production of ${\chi }_c$- and ${\chi }_b$-mesons in high energy hadronic collisions
• Simultaneous production of charmonium and bottomonium mesons at LHC
• Associative production of ${\rm Y}$ and open charm at LHC

Cited by in corpus (15)

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• Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector
• Producing fully-charm structures in the $J/\psi$-pair invariant mass spectrum
• Complete NLO QCD study of single- and double-quarkonium hadroproduction in the colour-evaporation model at the Tevatron and the LHC
• Double parton scattering in pair-production of $J/\psi$ mesons at the LHC revisited
• Fully-heavy structures in the invariant mass spectrum of $J/\psi \psi (3686)$, $J/\psi \psi (3770)$, $\psi (3686)\psi (3686)$, and $J/\psi {\rm Y}(1S)$ at hadron colliders
• Next-to-leading order QCD corrections to paired $B_c$ production in $e^{+}{e}^{-}$ annihilation
• Phenomenological analysis of associated production of $Z^0+b$ in the $b\to J/\psi X$ decay channel at the LHC
• Improved understanding of the peaking phenomenon existing in the new di-$J/\psi$ invariant mass spectrum from the CMS Collaboration
• Prospects for quarkonium studies at the high-luminosity LHC
• Photoproduction of the double $J/\psi$ (${\rm Y}$) at the LHC with forward proton tagging
• Production of $D$-wave states of $\bar{b}c$ quarkonium at the LHC
• Associated production of ${\chi }_c$ pairs with a gluon in the collinear-factorization approach