Regular Article – Theoretical Physics
Scalar fully-heavy tetraquark states in QCD sum rules
College of Physics, Hebei Normal University, 050024, Shijiazhuang, China
2 Hebei Key Laboratory of Photophysics Research and Application, Hebei Normal University, 050024, Shijiazhuang, China
3 School of Physics, University of Chinese Academy of Sciences, 100049, Beijing, China
4 CAS Center for Excellence in Particle Physics, 100049, Beijing, China
Accepted: 27 March 2021
Published online: 16 April 2021
Very recently, the LHCb Collaboration observed distinct structures with the in the -pair mass spectrum. In this work, we construct four scalar () type currents to investigate the fully-heavy tetraquark state in the framework of QCD sum rules, where and . Our results suggest that the broad structure around 6.2-6.8 GeV can be interpreted as the octet–octet tetraquark states with masses GeV and GeV, and the narrow structure around 6.9 GeV can be interpreted as the octet–octet tetraquark states with masses GeV and GeV, respectively. Extending to the b-quark sector,the masses of their fully-bottom partners are found to be around 18.38-18.59 GeV. Additionally, we also analyze the spectra of the and tetraquark states, which lie in the range of 12.51–12.74 GeV and 12.49–12.81 GeV, respectively.
© The Author(s) 2021
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