Observation of $D^{0(+)}\to K^0_S\pi^{0(+)}\eta^\prime$ and improved measurement of $D^0\to K^-\pi^+\eta^\prime$

TL;DR

This paper reports the first observation of certain $D$ meson decays involving $K^0_S$, $ o ext{pi}^0$, $ ext{eta}^ extprime$, and provides an improved measurement of the $D^0 o K^- extpi^+ exteta}^ extprime$ decay branching fraction, using BESIII data.

Contribution

First observation of $D^0 o K^0_S extpi^0 exteta}^ extprime$ and $D^+ o K^0_S extpi^+ exteta}^ extprime$ decays, with improved precision on $D^0 o K^- extpi^+ exteta}^ extprime$ branching fraction.

Findings

Branching fractions measured with improved precision.

First observation of $D^0 o K^0_S extpi^0 exteta}^ extprime$ and $D^+ o K^0_S extpi^+ exteta}^ extprime$ decays.

Significant enhancement in measurement accuracy.

Abstract

By analyzing $2.93\ \rm fb^{-1}$ of data taken at a center-of-mass energy of 3.773~GeV with the BESIII detector, we measure the branching fractions of the Cabibbo-favored hadronic decays $D^0\to K^-\pi^+\eta^\prime$, $D^0\to K^0_S\pi^0\eta^\prime$ and $D^+\to K^0_S\pi^+\eta^\prime$, which are determined to be $(6.43 \pm 0.15_{\rm stat.} \pm 0.31_{\rm syst.})\times 10^{-3}$, $(2.52 \pm 0.22_{\rm stat.} \pm 0.15_{\rm syst.})\times 10^{-3}$ and $(1.90 \pm 0.17_{\rm stat.} \pm 0.13_{\rm syst.})\times 10^{-3}$, respectively. The precision of the branching fraction of $D^0\to K^-\pi^+\eta^\prime$ is significantly improved, and the processes $D^0\to K^0_S\pi^0\eta^\prime$ and $D^+\to K^0_S\pi^+\eta^\prime$ are observed for the first time.