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The masses of the ground state and excited heavy tetraquarks with hiddencharm and bottom are calculated within the relativistic diquark-antidiquarkpicture. The dynamics of the light quark in a heavy-light diquark is treatedcompletely relativistically. The diquark structure is taken into account bycalculating the diquark-gluon form factor. New experimental data oncharmonium-like states above the open charm threshold are discussed. Theobtained results indicate that X(3872), Y(4260), Y(4360), Z(4433) and Y(4660)can be tetraquark states with hidden charm.

Relativistic description of heavy tetraquarks