Hidden-charm Hexaquarks from Lattice QCD

Abstract

We present a lattice QCD study of hidden-charm hexaquarks with quark content $usc\bar{d}\bar{s}\bar{c}$ based on four ensembles of gauge configurations generated by CLQCD Collaboration with pion mass in the range of 220-300MeV. Four operators with quantum numbers $0^{++},0^{-+},1^{++}$ and $1^{--}$ respectively are constructed to interpolate the hexaquarks. After validating the spectrum and the dispersion relation for ordinary hadrons, we calculate the masses of the hexaquarks and extrapolate the results to the physical pion mass and the continuum limit. We find that the masses of the four hexaquarks are all below the ${\Xi }_c{\bar{\Xi }}_c$ threshold, while the $0^{-+}$ hexaquark lies around the ${\eta }_c{K}^{+}{K}^{-}$ threshold. These results will be helpful for experimental searches in future and for a deep understanding of the nature of multiquark states.

Comments: 7 pages, 6 figures