Relativistic description of heavy tetraquarks

TL;DR

This paper calculates the masses of heavy tetraquarks with hidden charm and bottom using a relativistic diquark-antidiquark model, providing insights into several experimentally observed charmonium-like states as potential tetraquarks.

Contribution

It introduces a fully relativistic treatment of light quark dynamics in heavy-light diquarks and incorporates diquark-gluon form factors to predict tetraquark masses.

Findings

X(3872), Y(4260), Y(4360), Z(4433), Y(4660) can be tetraquark states with hidden charm

The relativistic model successfully describes heavy tetraquark masses

The approach explains experimental charmonium-like states as tetraquarks

Abstract

The masses of the ground state and excited heavy tetraquarks with hidden charm and bottom 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 the open charm threshold are discussed. The obtained results indicate that X(3872), Y(4260), Y(4360), Z(4433) and Y(4660) can be tetraquark states with hidden charm.