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

TL;DR

This paper reports a precise measurement of the absolute branching fraction of the semileptonic decay $D^{+} ightarrowar K^0 e^{+} u_{e}$ using BESIII data, confirming previous results and improving accuracy.

Contribution

First measurement of the absolute branching fraction of $D^{+} ightarrowar K^0 e^{+} u_{e}$ via $ar K^0 oar K^0_S o ext{pi}^0 ext{pi}^0$ with BESIII data.

Findings

Branching fraction measured as (8.59 ± 0.14 ± 0.21)%

Result consistent with previous measurements

Improved precision over earlier results

Abstract

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 $D^+\rightarrow\bar K^0 e^{+}\nu_{e}$ 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.