Measurement of $D^+ \to K_S^0 K^+$ and $D^+_s \to K_S^0 \pi^+$ branching ratios

TL;DR

This paper presents precise measurements of specific branching ratios for D meson decays involving K_S^0 and charged kaons or pions, improving the accuracy of previous results using a large data sample from the Belle detector.

Contribution

It provides the most precise measurements to date of these branching ratios, refining our understanding of charm meson decay processes.

Findings

Measured branching ratio D^+ to K_S^0 K^+ relative to D^+ to K_S^0 π^+ as 0.1899±0.0011±0.0022.

Measured branching ratio D_s^+ to K_S^0 π^+ relative to D_s^+ to K_S^0 K^+ as 0.0803±0.0024±0.0019.

Utilized 605 fb^{-1} of data from the Belle detector at KEKB.

Abstract

We report an improved measurement of $D^+ \to K_S^0 K^+$ and $D^+_s\to K_S^0 \pi^+$ branching ratios using 605 fb$^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The measured branching ratios with respect to the Cabibbo-favored modes are $\mathcal{B}(D^+ \to K_S^0 K^+)/\mathcal{B}(D^+ \to K_S^0 \pi^+)$ = 0.1899$\pm0.0011\pm$0.0022 and $\mathcal{B}(D^+_s \to K_S^0 \pi^+)/\mathcal{B}(D^+_s \to K_S^0 K^+)$ = 0.0803$\pm0.0024\pm$0.0019 where the first uncertainties are statistical and the second are systematic.