https://doi.org/10.1140/epjc/s10052-021-09096-7
Regular Article – Theoretical Physics
Scalar fully-heavy tetraquark states
in QCD sum rules
1
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
Received:
17
February
2021
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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