Interpretation of Axial Resonances in J/psi-phi at LHCb

TL;DR

This paper interprets the J/psi-phi structures observed at LHCb as tetraquark multiplets, predicting their composition, masses, and possible unresolved states, providing a new framework for understanding these resonances.

Contribution

It introduces a tetraquark multiplet model for J/psi-phi structures, explaining observed states and predicting missing particles and their masses.

Findings

J/psi-phi structures fit into two tetraquark multiplets

X(4274) may be two unresolved states with different J^PC

Predicted masses for missing particles in the multiplets

Abstract

We suggest that the J/psi phi structures observed by LHCb can be fitted in two tetraquak multiplets, the S-wave ground state and the first radial excitation, with composition [cs][cbar sbar]. When compared to the previously identified [cq][cbar qbar] multiplet, the observed masses agree with what expected for a multiplet with q -->s. We propose the X(4274), fitted by LHCb with a single 1^++ resonance, to correspond rather to two, almost degenerate, unresolved lines with J^PC = 0^++, 2^++. Masses of missing particles in the 1S and 2S multiplets are predicted.