File:PhysRevC.99.045206.pdf

English: In the hadrocharmonium picture a ¯cc state and a light hadron form a bound state. The effective interaction is described in terms of the chromoelectric polarizability of the ¯cc state and energy-momentum-tensor densities of the light hadron. This picture is justified in the heavy quark limit, and may successfully account for a hidden-charm pentaquark state recently observed by the LHCb Collaboration. In this work we extend the formalism to the description of hidden-charm tetraquarks, and address the question of whether the resonant states observed by LHCb in the J/ψ−ϕ spectrum can be described as hadrocharmonia. This is a nontrivial question because nothing is known about the ϕ meson energy-momentum-tensor densities. With rather general assumptions about energy-momentum-tensor densities in the ϕ meson we show that a ψ(2S)−ϕ bound state can exist, and we obtain a characteristic relation between its mass and width. We show that the tetraquark X(4274) observed by LHCb in the J/ψ−ϕ spectrum is a good candidate for a hadrocharmonium. We make predictions which will allow testing this picture. Our method can be generalized to identify other potential hadrocharmonia.