Measurement of branching fractions of $D^+_s\to K^0_SK^0_S \pi^+\pi^0$ and $D^+_s\to K^0_S K^+\pi^0\pi^0$

TL;DR

This paper reports the first measurements of branching fractions for two specific hadronic decay modes of the $D_s^+$ meson using data from the BESIII detector, providing new quantitative insights into these decay processes.

Contribution

It presents the first observation and measurement of the branching fractions for $D_s^+ o K^0_S K^0_S o ext{final states}$ and $D_s^+ o K^0_S K^+ o ext{final states}$ decays, expanding knowledge of $D_s^+$ decay channels.

Findings

Branching fraction for $D_s^+ o K^0_S K^0_S o ext{final states}$ is $(4.08 imes 10^{-3})$ with uncertainties.

Branching fraction for $D_s^+ o K^0_S K^+ o ext{final states}$ is $(3.32 imes 10^{-3})$ with uncertainties.

First observation of these decay modes with quantified branching fractions.

Abstract

By analyzing $e^+e^-$ collision data corresponding to an integrated luminosity of 7.33~fb$^{-1}$ collected with the BESIII detector at center-of-mass energies ranging from 4.128 to 4.226~GeV, we report the observations of the hadronic decays $D^+_s\to K^0_SK^0_S\pi^+\pi^0$ and $D^+_s\to K^0_S K^+\pi^0\pi^0$. Their decay branching fractions are determined to be ${\mathcal B}(D^+_s\to K^0_SK^0_S \pi^+\pi^0)=(4.08\pm0.46_{\rm stat}\pm0.45_{\rm syst})\times 10^{-3}$ and ${\mathcal B}(D^+_s\to K^0_S K^+\pi^0\pi^0)=(3.32\pm0.64_{\rm stat}\pm0.31_{\rm syst})\times 10^{-3}$, where the first uncertainties are statistical and the second are systematic.