Study of Cabibbo Suppressed Decays of the Ds Charmed-Strange Meson involving a KS

TL;DR

This paper reports the discovery of new Cabibbo suppressed decay modes of the Ds meson involving a Ks, providing measurements of their branching ratios and expanding understanding of charm meson decay processes.

Contribution

The study identifies and measures two previously unobserved Cabibbo suppressed decay modes of the Ds meson involving Ks, with quantified branching ratios.

Findings

Discovery of Ds -> Kspi-pi+pi+ decay mode with 179 events.

Observation of Ds -> Kspi+ decay mode with 113 events.

Measured branching ratios for both decay modes.

Abstract

We study the decay of Ds meson into final states involving a Ks and report the discovery of Cabibbo suppressed decay modes Ds -> Kspi-pi+pi+ (179 +/- 36 events) and Ds -> Kspi+ (113 +/-26 events). The branching ratios for the new modes are Gamma(Ds -> Kspi-pi+pi+)/Gamma(Ds -> KsK-pi+pi+) = 0.18 +/- 0.04 +/- 0.05 and Gamma(Ds -> Kspi+)/Gamma(Ds -> KsK+) = 0.104 +/- 0.024 +/- 0.013.