$0^{+}$ tetraquark states from improved QCD sum rules: delving into $X(5568)$

Jian-Rong Zhang, Jing-Lan Zou, Jin-Yun Wu

In order to investigate the possibility of the recently observed $X(5568)$ being a $0^{+}$ tetraquark state, we make an improvement to the study of the related various configuratio…