Abstract
We study the mass spectra for the cccc and bbbb tetraquark states by developing a moment sum rule method. Our results show that the bbbb 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 cccc are higher than the spontaneous dissociation thresholds of two charmonium mesons. We suggest to search for such states in the J/Ψ/J/Ψ and Ψc(1S) Ψc(1S) channels.
Highlights
The configurations of multiquark states were proposed by Gell-Mann [1] and Zweig [2] at the birth of quark model (QM)
Since 2003, plenty of charmoniumlike states have been observed and the hidden-charm qcqctetraquark fomalism is extensively discussed to explain the nature of these new XYZ states [4,5,6,7,8,9,10,11]
There are some discussions about the masses and decays of the QQQ Qstates [22,23,24,25,26,27,28,29,30]
Summary
The configurations of multiquark states were proposed by Gell-Mann [1] and Zweig [2] at the birth of quark model (QM). In the past fifty years, it has been an extremely intriguing research issue of searching for multiquark matter. The light tetraquark qqqqstate has been used to investigate the scalar mesons below 1 GeV [3]. Since 2003, plenty of charmoniumlike states have been observed and the hidden-charm qcqctetraquark fomalism is extensively discussed to explain the nature of these new XYZ states [4,5,6,7,8,9,10,11]. We develop a moment QCD sum rule method to calculate the mass spectra for the doubly hidden-charm/bottom ccccand bbbbtetraquark states
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