Strong decay patterns of the hidden-charm tetraquarks

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With the spin rearrangement, we have performed a comprehensive investigation of the decay patterns of the S-wave tetraquarks and P-wave tetraquarks where the P-wave excitation exists either between the diquark and anti-diquark pair or inside the diquark. Especially, we compare the decay patterns of Y(4260) with different inner structures such as the conventional charmonium, the molecule, the P-wave tetraquark and the hybrid charmonium. We notice the J/ψππ mode is suppressed in the heavy quark symmetry limit if Y(4260) is a molecular state. Moreover the hybrid charmonium and hidden-charm tetraquark have very similar decay patterns. Both of them decay into the J/ψππ and open charm modes easily. We also discuss the decay patterns of X(3872), Y(4360), and several charged states such as Zc(4020). The hcπ± decay mode disfavors the tetraquark assumption of Zc(4020).