Excited heavy tetraquarks with hidden charm

Understand

The masses of the excited heavy tetraquarks with hidden charm are calculated within the relativistic diquark-antidiquark picture.

• The dynamics of the light quark in a heavy-light diquark is treated completely relativistically.
• The diquark structure is taken into account by calculating the diquark-gluon form factor.
• New experimental data on charmonium-like states above open charm threshold are discussed.