Decoding the $X(5568)$ as a fully open-flavor $su\bar{b}\bar{d}$ tetraquark state

Wei Chen, Hua-Xing Chen, Xiang Liu +2

We investigate the recent evidence for a charged $X(5568)$ meson as an exotic open-flavor tetraquark state $su\bar{b}\bar{d}$ with $J^P=0^{+}/1^{+}$ in the framework of QCD sum rules. We…