Producing fully-charm structures in the $J/\psi$-pair invariant mass spectrum

Abstract

Very recently, the LHCb Collaboration reported the observation of several enhancements in the invariant mass spectrum of a $J/\psi$ pair between 6.2 and 7.4 GeV. In this work, we propose the dynamical mechanism to mimic the experimental data of a di-$J/\psi$ mass spectrum given by LHCb, which is based on the reactions, where all the possible combinations of a double charmonium directly produced by a proton-proton collision are transferred into a final state $J/\psi J/\psi$. We find that the LHCb experimental data can be well reproduced. We further extend our framework to study a di-${\rm Y}(1S)$ system, and give the line shape of a differential cross section of a partner process in a $b\bar{b}$ system on the invariant mass of ${\rm Y}(1S){\rm Y}(1S)$, which shows that there should exist possible enhancements near $m_{{\rm Y}(1S){\rm Y}(1S)}=$19.0, 19.3, 19.7 GeV in the ${\rm Y}(1S)$-pair invariant mass spectrum. These predictions can be tested in LHCb and CMS, which can be as a potential research issue in near future.

5 pages, 1 table and 2 figures

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Cited by in corpus (33)

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• On the mechanism of $T_{4c}(6900)$ tetraquark production
• Insights into the inner structures of the fully charmed tetraquark state $X(6900)$
• Is the existence of a $J/\psi J/\psi$ bound state plausible?
• Exotic resonances of fully-heavy tetraquarks in a lattice-QCD insipired quark model
• Hunting for states in the recent LHCb di-$J/\psi$ invariant mass spectrum
• Higher mass spectra of the fully-charmed and fully-bottom tetraquarks
• Mass spectra and wave functions of $T_{QQ\bar{Q}\bar{Q}}$ tetraquarks
• Higher fully-charmed tetraquarks: Radial excitations and P-wave states
• $S$-wave fully charmed tetraquark resonant states
• Fully heavy pentaquarks
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• The lineshape of the compact fully heavy tetraquark
• Going in quest of potential tetraquark interpretations for the newly observed $T_{\psi \psi }$ states in light of the diquark-antidiquark scenarios
• Hunting for tetraquarks in ultra-pheripheral heavy ion collisions
• Masses of fully-heavy tetraquark states from a four-quark static potential model
• 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
• Decay behaviors of the fully-bottom and fully-charm tetraquark states
• Fully heavy pentaquark states in constituent quark model
• Triply-heavy tetraquarks in an extended relativized quark model
• Improved understanding of the peaking phenomenon existing in the new di-$J/\psi$ invariant mass spectrum from the CMS Collaboration
• The two-photon decay of X(6900) from light-by-light scattering at the LHC
• Nature of the $X(6900)$ in partial wave decomposition of $J/\psi J/\psi$ scattering
• A possible interpretation for $X(6900)$ observed in four-muon final state by LHCb -- A light Higgs-like boson?
• The two-body strong decays of the fully-charm tetraquark states
• Fully charmed P-wave tetraquark resonant states in the quark model
• Strong decays of the fully-charm tetraquark states with explicit P-waves via the QCD sum rules
• Discovering an Unquenched Dynamics Mechanism for Charmonium Scattering
• Four-Charm-Quark Matter from the CMS Collaboration as a Witness of the Development of High-Precision Hadron Spectroscopy
• All Heavy Tetraquarks: The Dynamical Diquark Model and Other Approaches