Spectroscopy of the hidden-charm $[qc][\bar q \bar c]$ and $[sc][\bar s \bar c]$ tetraquarks

TL;DR

This paper calculates the spectrum of hidden-charm tetraquarks using a relativized diquark model, successfully explaining 13 observed charmonium-like states as tetraquark configurations.

Contribution

It introduces a relativized diquark model to compute tetraquark spectra, providing a new framework to interpret charmonium-like states as tetraquarks.

Findings

13 charmonium-like states fit into the tetraquark spectrum

Both hidden-charm and hidden-strange sectors are explained

Diquark model effectively describes tetraquark configurations

Abstract

We calculate the spectrum of $q\bar q c \bar c$ and $s\bar s c \bar c$ tetraquarks, where $q$, $s$ and $c$ stand for light ($u,d$), strange and charm quarks, respectively, in a relativized diquark model, characterized by one-gluon-exchange (OGE) plus confining potential. In the diquark model, a $q\bar q c \bar c$ ($s\bar s c \bar c$) tetraquark configuration is made up of a heavy-light diquark, $q c$ ($sc$), and anti-diquark, $\bar q \bar c$ ($\bar s \bar c$). According to our results, 13 charmonium-like observed states can be accommodated in the tetraquark picture, both in the hidden-charm ($q\bar q c \bar c$) and hidden-charm hidden-strange ($s\bar s c \bar c$) sectors.