Interpretation of structure in the di-$J/\psi$ spectrum

TL;DR

This paper interprets structures in the di-J/psi spectrum as tetraquark resonances with specific quantum numbers, using a string-junction model to predict their masses and explain observed spectral features.

Contribution

It introduces a string-junction model to calculate tetraquark masses and interprets experimental di-J/psi spectrum features as resonances and channel openings.

Findings

Predicted the 0^{++}(2S) tetraquark at 6.871 GeV.

Identified dips as channel openings like di-chi_c0 and di-eta_c(2S).

Suggested a broad 2^{++}(1S) resonance around 6400 MeV.

Abstract

Structure in the di-$J/\psi$ mass spectrum observed by the LHCb experiment around 6.9 and 7.2 GeV is interpreted in terms of $J^{PC}=0^{++}$ and $2^{++}$ resonances between a $cc$ diquark and a $\bar c \bar c$ antidiquark, using a recently confirmed string-junction picture to calculate tetraquark masses. The main peak around 6.9 GeV is likely dominated by the $0^{++}(2S)$ state, a radial excitation of the $cc$-$\bar c \bar c$ tetraquark, which we predict at $6.871\pm 0.025$ GeV. The dip around 6.75 GeV is ascribed to the opening of the \Swave\ di-$\chi_{c0}$ channel, while the dip around 7.2 GeV could be correlated with the opening of the di-$\eta_c(2S)$ or $\Xi_{cc} \bar \Xi_{cc}$ channel. The low-mass part of the di-$J/\psi$ structure appears to require a broad resonance consistent with a predicted $2^{++}(1S)$ state with invariant mass around $M_{\rm inv} = 6400$ MeV. Implications for $bb \bar b \bar b$ tetraquarks are discussed.