Probing an axial-vector tetraquark $Z_s$ via its semileptonic decay $Z_s\to X(4274)\bar{l}{\nu }_l$

The semileptonic decays of the open charm-bottom axial-vector tetraquark $Z_s=[cs][\bar{b}\bar{s}]$ to $X(4274)\bar{l}{\nu }_l$, $l=e, \mu, \tau $areexploredbymeansoftheQCDthree-pointsumrulemethod\mathrm{.}Both$Z_{s}$and$X(4274)=[cs][\overline{c}\overline{s}]$ are treated as color sextet diquark-antidiquark states. The full width of the decays $Z_s \to X(4274)\overline{l} \nu_l$isfound\mathrm{.}Obtainedpredictionsfor$ \Gamma(Z_s \to X(4274)\overline{l} \nu_l)$ demonstrate that, as in the case of the conventional hadrons, the semileptonic transitions form a very small part of its full width.