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• W3186122983 abstract "In the QCD sum rules for the tetraquark (molecular) states, the higher dimensional vacuum condensates play an important role in extracting the tetraquark masses. We carry out the operator product expansion up to the vacuum condensates of dimension-10 and observe that the vacuum condensates of dimensions $6$, $8$ and $10$ have the same expressions but opposite signs for the $Cgamma_5otimes gamma_mu C$-type and $Cotimes gamma_mu C$ type four-quark currents, which make their influences distinguishable, and they are excellent channels to examine the vacuum saturation approximation. We introduce a parameter $kappa$ to parameterize the derivation from the vacuum saturation or factorization approximation, and choose two sets parameters to examine the influences on the predicted tetraquark masses, which can be confronted to the experimental data in the future. In all the channels, smaller value of the $kappa$ leads to better convergent behavior in the operator product expansion, which favors the vacuum saturation approximation." @default.
• W3186122983 created "2021-08-02" @default.
• W3186122983 creator A5060185042 @default.
• W3186122983 date "2021-11-20" @default.
• W3186122983 modified "2023-10-18" @default.
• W3186122983 title "Does vacuum saturation work for the higher-dimensional vacuum condensates in the QCD sum rules?" @default.
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• W3186122983 doi "https://doi.org/10.1142/s0217751x21502468" @default.
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