Doubly hidden-charm/bottom $QQ\bar{Q}\bar{Q}$ tetraquark states

Abstract

We study the mass spectra for the $cc\bar{c}\bar{c}$ and $bb\bar{b}\bar{b}$ tetraquark states by developing a moment sum rule method. Our results show that the $bb\bar{b}\bar{b}$ tetraquarks lie below the threshold of ${\eta }_b(1S){\eta }_b(1S)$. They are probably stable and very narrow. The masses for the doubly hidden-charm states $cc\bar{c}\bar{c}$ are higher than the spontaneous dissociation thresholds of two charmonium mesons. We suggest to search for such states in the $J/\psi J/\psi$ and ${\eta }_c(1S){\eta }_c(1S)$ channels.

Comments: 8 pages, 2 figures. More references added. Conference proceedings for 6th International Conference on New Frontiers in Physics (ICNFP 2017), Crete, Greece, 17-29 Aug, 2017