Suppressed Decays of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>D</mml:mi><mml:mi>s</mml:mi><mml:mo>+</mml:mo></mml:msubsup></mml:math>Mesons to Two Pseudoscalar Mesons

G. S. Adams, Mark Anderson, J. P. Cummings, I. Danko, D. Hu, B. Moziak, J. Napolitano, Q. He, J. Insler, H. Muramatsu

Abstract

Using data collected near the ${D}_{s}^{*+}{D}_{s}^{\ensuremath{-}}$ peak production energy ${E}_{\mathrm{cm}}=4170\text{ }\text{ }\mathrm{MeV}$ 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 ${K}^{+}\ensuremath{\eta}$, ${K}^{+}{\ensuremath{\eta}}^{\ensuremath{'}}$, ${\ensuremath{\pi}}^{+}{K}_{S}^{0}$, ${K}^{+}{\ensuremath{\pi}}^{0}$, and the isospin-forbidden decay mode ${D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$. We normalize with respect to the Cabibbo-favored ${D}_{s}^{+}$ modes ${\ensuremath{\pi}}^{+}\ensuremath{\eta}$, ${\ensuremath{\pi}}^{+}{\ensuremath{\eta}}^{\ensuremath{'}}$, and ${K}^{+}{K}_{S}^{0}$, and obtain ratios of branching fractions: $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}\ensuremath{\eta})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\eta})=(8.9\ifmmode\pm\else\textpm\fi{}1.5\ifmmode\pm\else\textpm\fi{}0.4)%$, $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\eta}}^{\ensuremath{'}})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\eta}}^{\ensuremath{'}})=(4.2\ifmmode\pm\else\textpm\fi{}1.3\ifmmode\pm\else\textpm\fi{}0.3)%$, $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{K}_{S}^{0})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{K}_{S}^{0})=(8.2\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}0.2)%$, $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{0})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{K}_{S}^{0})=(5.5\ifmmode\pm\else\textpm\fi{}1.3\ifmmode\pm\else\textpm\fi{}0.7)%$, and $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{K}_{S}^{0})&lt;4.1%$ at 90% C.L., where the uncertainties are statistical and systematic, respectively.

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