Scalar and tensor structures in $J/\psi J/\psi$ scattering from lattice QCD

Abstract

The ${}^1{S}_0$ and ${}^5{S}_2$ amplitudes of $J/\psi J/\psi$ scattering are determined up to 6.6~GeV from $N_f=2$ lattice QCD simulations at $m_{\pi }\approx 420$~MeV and $250$~MeV. We observe an attractive interaction in the ${}^1{S}_0$ channel, which permits the existence of a near-threshold scalar structure. This structure may correspond to $X(6200)$, but the possible left-hand-cut effect prevents us from a precise pole determination. In the ${}^5{S}_2$ channel, while a near-threshold repulsive interaction is observed, a resonance appears at higher energies associated with a Castillejo-Dalitz-Dyson zero ${\sqrt{s}}_{\mathrm{CDD}}\approx 6.45\mathrm{GeV}$ of the scattering amplitude. The tensor resonance has the parameters $(m_R,{\Gamma }_R)=(6.543(10),0.548(34))\mathrm{GeV}$ for $m_{\pi }\approx 420\mathrm{MeV}$ and $(6.538(13),0.537(56))\mathrm{GeV}$ for $m_{\pi }\approx 250\mathrm{MeV}$, which are compatible with those of $X(6600)$ (or $X(6400)$) reported by ATLAS and CMS, and also support the $2^{++}$ assignment of the recent CMS study. The difference of the ${}^1{S}_0$ and ${}^5{S}_2$ $J/\psi J/\psi$ interaction is attributed to the dominance of the quark rearrangement effects. The systematic uncertainties owing to the unphysical pion mass, the finite lattice spacing, and the finite volume should be investigated by future lattice QCD studies with more sophisticated lattice setups.