Bridging doubly heavy tetraquark mass spectrum with heavy baryons utilizing heavy antiquark-diquark symmetry

TL;DR

This paper predicts masses of various doubly heavy tetraquarks using heavy antiquark-diquark symmetry, identifying several potentially stable states and connecting tetraquark spectra with heavy baryons to understand heavy-quark hadron systematics.

Contribution

It introduces a systematic mass prediction for 38 doubly heavy tetraquarks using HADS within a constituent quark model, linking tetraquark and baryon spectra.

Findings

Several stable $bbar{q}ar{q}'$ tetraquarks below meson-meson thresholds.

Predicted masses for 38 ground-state tetraquarks with various heavy quark combinations.

Explicit connection between tetraquark and heavy baryon spectra via HADS.

Abstract

Motivated by the observation of the doubly charmed tetraquark $T_{cc}(3875)^+$, we present a systematic study of double heavy tetraquarks ($T_{QQ'\bar{q}\bar{q}'}$) using heavy antiquark-diquark symmetry (HADS) within a constituent quark model. By calibrating model parameters to known hadron spectra and incorporating the effective mass formula, we predict the masses for 38 ground-state tetraquarks with $cc$, $bb$, and $bc$ heavy quark pairs, including the non-strange, single-strange, and double-strange configurations with quantum numbers $J^P = 0^+, 1^+$ and $2^+$. Notably, we identify several stable states below the relevant meson-meson thresholds, particularly in the $bb\bar{q}\bar{q}'$ sector. The explicit connection between doubly heavy tetraquark and heavy baryon spectra through HADS reduces model dependence and reveals fundamental systematics in the heavy-quark hadron landscape.