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 $η_b(1S)η_b(1S)$. 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 $J/ψJ/ψ$ and $η_c(1S)η_c(1S)$ channels.

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