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

TL;DR

This paper reports precise measurements of certain D meson decays, including first observations of some channels, significantly improving the accuracy of known branching fractions using data from the BESIII detector.

Contribution

The study provides the first observation of $D^0 o K^0_S o ext{pi}^0 ext{omega}$ and $D^+ o K^0_S o ext{pi}^+ ext{omega}$ decays, and enhances the precision of the $D^0 o K^- ext{pi}^+ ext{omega}$ branching fraction.

Findings

Measured branching fractions with improved precision.

First observation of $D^0 o K^0_S ext{pi}^0 ext{omega}$ and $D^+ o K^0_S ext{pi}^+ ext{omega}$.

Enhanced accuracy of $D^0 o K^- ext{pi}^+ ext{omega}$ measurement.

Abstract

By analyzing an $e^+e^-$ annihilation data sample with an integrated luminosity of $2.93\ \rm fb^{-1}$ taken at the center-of-mass energy of 3.773 GeV with the BESIII detector, we determine the absolute branching fractions of the hadronic decays $D^0\to K^-\pi^+\omega$, $D^0\to K^0_S\pi^0\omega$, and $D^+\to K^0_S\pi^+\omega$ to be $(3.392 \pm 0.044_{\rm stat} \pm 0.085_{\rm syst})\%$, $(0.848 \pm 0.046_{\rm stat} \pm 0.031_{\rm syst})\%$, and $(0.707 \pm 0.041_{\rm stat} \pm 0.029_{\rm syst})\%$, respectively. The accuracy of the branching fraction measurement of the decay $D^0\to K^-\pi^+\omega$ is improved by a factor of seven compared to the world average value. The $D^{0}\to K^0_S\pi^{0}\omega$ and $D^{+}\to K^0_S\pi^{+}\omega$ decays are observed for the first time.