Measurement of branching fractions and $CP$ asymmetries for $D_s^{+} \rightarrow K^+ (\eta, \pi^0) $ and $D_s^{+} \rightarrow \pi^+ (\eta, \pi^0)$ decays at Belle

TL;DR

This paper presents precise measurements of branching fractions and $CP$ asymmetries for specific $D_s^{+}$ decays using Belle data, finding no evidence of $CP$ violation.

Contribution

It provides the most precise $CP$ asymmetry measurements for these decays to date, improving understanding of $CP$ violation in charm meson decays.

Findings

Most precise $CP$ asymmetry measurements to date

No evidence of $CP$ violation observed

Branching fractions measured with high accuracy

Abstract

We report measurements of the branching fractions and $CP$ asymmetries for $D_s^{+} \rightarrow K^{+} \eta $, $D_s^{+} \rightarrow K^{+} \pi^0 $, and $D_s^{+} \rightarrow \pi^{+} \eta $ decays, and the branching fraction for $D_s^{+} \rightarrow \pi^{+} \pi^0$. Our results are based on a data sample corresponding to an integrated luminosity of 921 fb$^{-1}$ collected by the Belle detector at the KEKB $e^+e^-$ asymmetric-energy collider. Our measurements of $CP$ asymmetries in these decays are the most precise to-date; no evidence for $CP$ violation is found.