Doubly hidden-charm/bottom QQ Q Q tetraquark states
Abstract
We study the mass spectra for the cc c c and bb b b tetraquark states by developing a moment sum rule method. Our results show that the bb b b tetraquarks lie below the threshold of ηb(1S)ηb(1S). They are probably stable and very narrow. The masses for the doubly hidden-charm states cc c c are higher than the spontaneous dissociation thresholds of two charmonium mesons. We suggest to search for such states in the J/ J/ and ηc(1S)ηc(1S) channels.
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