Measurement of Singly Cabibbo-Suppressed Decays $D \to \omega \pi \pi$

TL;DR

This paper reports precise measurements of the branching fractions for certain singly Cabibbo-suppressed decays of D mesons using BESIII data, improving previous results and providing first measurements for some decay modes.

Contribution

It provides the first measurement of the branching fraction for $D^+ o ho^+ ho^0$ and improves the precision of $D^0 o ho^0 ho^0$ measurements, enhancing understanding of charm decays.

Findings

Measured $ ext{Br}(D^0 o ho^0 ho^0)$ with improved precision.

First measurement of $ ext{Br}(D^+ o ho^+ ho^0)$.

Set an upper limit on $ ext{Br}(D^0 o ho^0 ho^0)$ at 90\% confidence level.

Abstract

Using 2.93 fb$^{-1}$ of $e^{+}e^{-}$ collision data taken at a center-of-mass energy of 3.773 GeV by the BESIII detector at the BEPCII, we measure the branching fractions of the singly Cabibbo-suppressed decays $D \to \omega \pi \pi$ to be $\mathcal{B}(D^0 \to \omega \pi^+\pi^-) = (1.33 \pm 0.16 \pm 0.12)\times 10^{-3}$ and $\mathcal{B}(D^+ \to \omega \pi^+\pi^0) =(3.87 \pm 0.83 \pm 0.25)\times 10^{-3}$, where the first uncertainties are statistical and the second ones systematic. The statistical significances are $12.9\sigma$ and $7.7 \sigma$, respectively. The precision of $\mathcal{B}(D^0 \to \omega \pi^+\pi^-)$ is improved by a factor of 2.1 over the CLEO measurement, and $\mathcal{B}(D^+ \to \omega \pi^+\pi^0)$ is measured for the first time. No significant signal of $\mathcal{B}(D^0 \to \omega \pi^0\pi^0)$ is observed, and the upper limit on the branching fraction is $\mathcal{B}(D^0 \to \omega \pi^0\pi^0) < 1.10 \times 10^{-3}$ at the $90\%$ confidence level. The branching fractions of $D\to \eta \pi \pi$ are also measured and consistent with existing results.