Nature of $X(6900)$ and its production mechanism at LHCb

Abstract

We show that the Pomeron exchanges play a unique role in vector charmonium scatterings. Such a mechanism can provide a natural explanation for the nontrivial structures in the di-$J/\psi$ spectrum observed by the LHCb Collaboration. The narrow structure $X(6900)$, as a dynamically generated resonance pole, can arise from the Pomeron exchanges and coupled-channel effects between the $J/\psi$-$J/\psi$, $J/\psi$-$\psi (2S)$ scatterings. A pole structure near the di-$J/\psi$ threshold is also found. Meanwhile, we predict that $X(6900)$ can produce significant threshold enhancement in the $J/\psi$-$\psi (2S)$ energy spectrum which can be searched for at LHCb.

6 pages, 3 eps figures; version to appear in Phys. Lett. B

References in corpus (5)

• The ρρinteraction in the hidden gauge formalism and the f_0(1370) and f_2(1270) resonances
• $QQ\bar{Q}\bar{Q}$ states: masses, production, and decays
• Could the near-threshold $XYZ$ states be simply kinematic effects?
• Exotic meson-meson molecules and compact four--quark states
• Doubly charmed multibaryon systems

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