Mass spectra and decays of open-heavy tetraquark states

TL;DR

This paper systematically studies the mass spectra and decay channels of open-heavy tetraquark states using the ICMI model, predicting possible bound states and resonances, and suggesting the nature of the $X_0(2900)$ as a compact tetraquark.

Contribution

It provides a comprehensive prediction of tetraquark masses and decay channels using the ICMI model, including the identification of the $X_0(2900)$ as a specific tetraquark state.

Findings

Identification of potential bound states and narrow resonances.

Prediction that $X_0(2900)$ is likely a $udar{s}ar{c}$ tetraquark with $J^P=0^+$.

Most states result from strong channel coupling.

Abstract

Open-heavy tetraquark states, especially those contain four different quarks have drawn much attention in both theoretical and experimental fields. In the framework of the improved chromomagnetic interaction (ICMI) model, we complete a systematic study on the mass spectra and possible strong decay channels of the $S$-wave open-heavy tetraquark states, $qq\bar{q}\bar{Q}$ ($q=u,d,s$ and $Q=c,b$), with different quantum number $J^P=0^+$, $1^+$, and $2^+$. The parameters in the ICMI model are extracted from the conventional hadron spectra and used directly to predict the mass of tetraquark states. Several compact bound states and narrow resonances are found in both charm-strange and bottom-strange tetraquark sectors, most of them as a product of the strong coupling between the different channels. Our results show the recently discovered four different flavors tetraquark candidates $X_0(2900)$ is probably compact $ud\bar{s}\bar{c}$ state with quantum number $J^P=0^+$. The predictions about $X_0(2900)$ and its partners are expected to be better checked with other theories and future experiments.