Search for the semileptonic decays ${D}_{s}^{+}\to {K}_{1}\left(1270{\right)}^{0}{e}^{+}{\nu }_{e}$ and ${D}_{s}^{+}\to {b}_{1}\left(1235{\right)}^{0}{e}^{+}{\nu }_{e}$

By analyzing $7.33\text{}\text{}{\mathrm{fb}}^{-1}$ of ${e}^{+}{e}^{-}$ collision data collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we search for the semileptonic decays ${D}_{s}^{+}\to {K}_{1}\left(1270{\right)}^{0}{e}^{+}{\nu }_{e}$ and ${D}_{s}^{+}\to {b}_{1}\left(1235{\right)}^{0}{e}^{+}{\nu }_{e}$ for the first time. No significant signals are observed for either decay mode. The upper limits on the (product) branching fractions are determined to be $B\left[{D}_{s}^{+}\to {K}_{1}\left(1270{\right)}^{0}{e}^{+}{\nu }_{e}\right]<4.1×{10}^{-4}$ and $B\left[{D}_{s}^{+}\to {b}_{1}\left(1235{\right)}^{0}{e}^{+}{\nu }_{e}\right]·B\left[{b}_{1}\left(1235{\right)}^{0}\to \omega {\pi }^{0}\right]<6.4×{10}^{-4}$ at 90% confidence level.