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We investigate the recent evidence for a charged $X(5568)$ meson as an exoticopen-flavor tetraquark state $su\bar b\bar d$ with $J^P=0^+/1^+$ in theframework of QCD sum rules. We use the color antisymmetric $[\mathbf{\bar3_c}]_{su} \otimes [\mathbf{3_c}]_{\bar{b}\bar d}$ tetraquark currents in bothscalar and axial-vector channels to perform evaluations and numerical analyses.Our results imply that the $X(5568)$ can be interpreted as both the scalar$su\bar b\bar d$ tetraquark state and the axial-vector one, which are in goodagreement with the experimental measurement. We also discuss the possible decaypatterns of the $X(5568)$ and suggest to search for its neutral partner in theradiative decay into $B_s^0 \gamma$ and $B_s^* \gamma$, which can be used todetermine its spin-parity quantum numbers. Moreover, we predict its charmedpartner state around $2.55$ GeV with the quark content $su\bar c\bar d$ and$J^P=0^+/1^+$.

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