Abstract
In this article, we study the axialvector-diquark-axialvector-antidiquark type scalar, axialvector, tensor, and vector sss¯s¯ tetraquark states with the QCD sum rules. The predicted mass mX=2.08±0.12 GeV for the axialvector tetraquark state is in excellent agreement with the experimental value 2062.8±13.1±4.2 MeV from the BESIII collaboration and supports assigning the new X state to be a sss¯s¯ tetraquark state with JPC=1+−. The predicted mass mX=3.08±0.11 GeV disfavors assigning ϕ2170 or Y2175 to be the vector partner of the new X state. As a byproduct, we obtain the masses of the corresponding qqq¯q¯ tetraquark states. The light tetraquark states lie in the region about 2 GeV rather than 1 GeV.
Highlights
The BESIII collaboration studied the process J/ψ ⟶ φηη′ and observed a structure X in the φη′ mass spectrum [1]
The article is arranged as follows: we derive the QCD sum rules for the masses and pole residues of the ssss tetraquark states in Section 2; in Section 3, we present the numerical results and discussions; Section 4 is reserved for our conclusion
The predicted mass mX = 2:08 ± 0:12 GeV for the axialvector tetraquark state is in excellent agreement with the experimental value ð2062:8 ± 13:1 ± 4:2Þ MeV from the BESIII collaboration [1], which supports assigning the new
Summary
The BESIII collaboration studied the process J/ψ ⟶ φηη′ and observed a structure X in the φη′ mass spectrum [1]. [7], we take the nonet scalar mesons below 1 GeV as the two-quark-tetraquark mixed states and study their masses and pole residues with the QCD sum rules in detail and observe that the dominant Fock components of the nonet scalar mesons below 1 GeV are conventional twoquark states. We take the axialvector diquark operators as the basic constituents to construct the tetraquark current operators to study the scalar (S), axialvector (A), tensor (T), and vector (V) tetraquark states with the QCD sum rules and explore the possible assignments of the new X state. We take the axialvector diquark operators as the basic constituents because the favored configurations from the QCD sum rules are the scalar and axialvector diquark states [8,9,10]; the current operators or quark structures chosen in the present work differ from that in Ref. The article is arranged as follows: we derive the QCD sum rules for the masses and pole residues of the ssss tetraquark states in Section 2; in Section 3, we present the numerical results and discussions; Section 4 is reserved for our conclusion
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