Mass-Spectroscopy of Hidden Charm and Hidden Strange Tetraquarks in Diquark-Antidiquark Approach.

We investigated the four-quark systems with quark structures of c s c ¯ s ¯ , c q c ¯ s ¯ , b s b ¯ s ¯ , and b q b ¯ s ¯ in the framework of the non-relativistic quark model, motivated by the recent observation of exotic resonances X(4140), X(4274), X(4350), X(4500), and X(4700) reported by several experiment collaborations. The colour antitriplet-triplet configuration of diquark-antidiquark combinations with all conceivable quantum numbers have been used to calculate their masses. The results reveal that if the colour structure of the diquark-antidiquark configuration is 3 ¯ c ⊗ 3 , the tetraquarks structures may occur otherwise may observed as resonance. The X(4274) state, can be defined as the J PC = 2 + + tetraquark state, while the X(4140) state can be regarded as the J PC = 1 + + tetraquark state in this calculation. When radial excitation is considered, X(4700) may be explained as a 2 S radial excited tetraquark state with J PC = 0 + + . The orbitally excited states Y(4626), Y(4630) and Y(4660) can be explained as P-wave tetraquark with quantum number 1 - - . The masses of [ b s b ¯ s ¯ ] and [ b q b ¯ s ¯ ] are found to be in the range between 10.5 and 11.5 GeV and are very close to two-meson thresholds. [ABSTRACT FROM AUTHOR]