Measurement of the absolute branching fraction of $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$ via ${\bar{K}}^0\to {\pi }^0{\pi }^0$

By analyzing 2.93 fb${}^{-1}$ data collected at the center-of-mass energy $\sqrt{s}=3.773$ GeV with the BESIII detector, we measure the absolute branching fraction of the semileptonic decay $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$ to be ${\mathcal B}(D^{+}\rightarrow\bar K^0 e^{+}\nu_{e})=(8.59 \pm 0.14 \pm 0.21)%$using$\bar K^0\to K^0_S\to \pi^0\pi^0$, where the first uncertainty is statistical and the second systematic. Our result is consistent with previous measurements within uncertainties.