Quark mass dependence of doubly heavy tetraquark binding

TL;DR

This paper investigates how the masses of heavy quarks influence the binding energies of doubly heavy tetraquarks, building on recent experimental discoveries and refining previous theoretical models.

Contribution

It provides an updated analysis of heavy-heavy-light-light tetraquark candidates, emphasizing the dependence of their binding on light and heavy quark masses.

Findings

Confirmation of the existence of doubly heavy tetraquarks near meson thresholds

Analysis of how heavy quark mass variations affect tetraquark binding

Potential prediction of more deeply bound states with heavier quarks

Abstract

The existence of bound doubly heavy tetraquark states was confirmed by the recent LHCb discovery of the doubly charmed $T_{cc}$, less than 1 MeV below the meson pair threshold. Others states with two heavy (bottom or charm) quarks could also be bound, perhaps more deeply. Here we discuss our previous work, and the improvements in our current, updated analysis of various heavy-heavy-light-light tetraquark candidates, including the light and heavy quark mass dependence of the binding.