Suppressed Decays of $D_{s}^{+}$ Mesons to Two Pseudoscalar Mesons

Using data collected near the

D_{s}^{* +} D_{s}^{-}

peak production energy

E_{cm} = 4170 MeV

by the CLEO-c detector, we study the decays of

D_{s}^{+}

mesons to two pseudoscalar mesons. We report on searches for the singly Cabibbo-suppressed

D_{s}^{+}

decay modes

K^{+} η

K^{+} η^{'}

π^{+} K_{S}^{0}

K^{+} π^{0}

, and the isospin-forbidden decay mode

D_{s}^{+} \to π^{+} π^{0}

. We normalize with respect to the Cabibbo-favored

D_{s}^{+}

modes

π^{+} η

π^{+} η^{'}

, and

K^{+} K_{S}^{0}

, and obtain ratios of branching fractions:

B (D_{s}^{+} \to K^{+} η) / B (D_{s}^{+} \to π^{+} η) = (8.9 \pm 1.5 \pm 0.4) %

B (D_{s}^{+} \to K^{+} η^{'}) / B (D_{s}^{+} \to π^{+} η^{'}) = (4.2 \pm 1.3 \pm 0.3) %

B (D_{s}^{+} \to π^{+} K_{S}^{0}) / B (D_{s}^{+} \to K^{+} K_{S}^{0}) = (8.2 \pm 0.9 \pm 0.2) %

B (D_{s}^{+} \to K^{+} π^{0}) / B (D_{s}^{+} \to K^{+} K_{S}^{0}) = (5.5 \pm 1.3 \pm 0.7) %

, and

B (D_{s}^{+} \to π^{+} π^{0}) / B (D_{s}^{+} \to K^{+} K_{S}^{0}) < 4.1 %

at 90% C.L., where the uncertainties are statistical and systematic, respectively.

This publication has 6 references indexed in Scilit:

Review of Particle Physics
Journal of Physics G: Nuclear and Particle Physics, 2006
Measurement of Absolute Hadronic Branching Fractions of $D$ Mesons and $e^{+} e^{-} \to D \bar{D}$ Cross Sections at $E_{c . m .} = 3773 MeV$
Physical Review Letters, 2005
The CLEO RICH detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005
Two-body Cabibbo-suppressed charmed meson decays
Physical Review D, 2003
The CLEO III drift chamber
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2002
The CLEO II detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1992

Suppressed Decays ofDs+Mesons to Two Pseudoscalar Mesons