Light Tetraquark State Candidates

In this article, we study the axialvector-diquark-axialvector-antidiquark type scalar, axialvector, tensor, and vector sss over bar s over bar tetraquark states with the QCD sum rules. The predicted mass m(X)=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 ss (ss) over bar over bar s over bar tetraquark state with J(PC)=1(+-). The predicted mass m(X)=3.08 +/- 0.11 GeV disfavors assigning phi(2170) or Y(2175) to be the vector partner of the new X state. As a byproduct, we obtain the masses of the corresponding qqq over bar q over bar tetraquark states. The light tetraquark states lie in the region about 2 GeV rather than 1 GeV.