Abstract
Inspired by recent measurement of possible fully charmed tetraquarks in LHCb Collaboration, we investigate the mass spectra of fully heavy tetraquarks QQ {bar{Q}} {bar{Q}} in an extended relativized quark model. Our estimations indicate that the broad structure around 6.4 GeV should contain one or more ground states for cc {bar{c}} {bar{c}} tetraquarks, while the narrow structure near 6.9 GeV can be categorized as the first radial excitation of cc {bar{c}} {bar{c}} system. Moreover, with the wave functions of the tetraquarks and mesons, the strong decays of tetraquarks into heavy quarkonium pair are qualitatively discussed, which can be further checked by the LHCb and CMS Collaborations.
Highlights
Since the observation of X (3872) in 2003 [1], the searching for hadrons beyond the conventional mesons and baryons have become one of intriguing topics in the past decades
In Ref. [41], we extended the relativized quark model proposed by Godfrey and Isgur to investigate the doubly heavy tetraquarks with the same model parameters
The masses of four ground states lie in the range 6435– 6543 MeV, which are higher than the J/ψ J/ψ threshold
Summary
Since the observation of X (3872) in 2003 [1], the searching for hadrons beyond the conventional mesons and baryons have become one of intriguing topics in the past decades. A possible excess at 18.4 ± 0.1(stat.) ± 0.2(syst.)GeV/c2 in four lepton channel was reported, which may be a bbbbtetraquark state [11,12] This structure is below the threshold of bottomonium meson pair, which demonstrates that the decays into bottomonium meson pair through quark rearrangement should be hindered. [41], we extended the relativized quark model proposed by Godfrey and Isgur to investigate the doubly heavy tetraquarks with the same model parameters With such an extension, the tetraquaks and conventional mesons can be described in a uniform frame. We further study the full heavy tetraquarks Q Q Q Qin the extended relativized quark model and give possible interpretation of the newly observed state around 6.9 GeV.
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