Showing papers by "L. Köpke published in 1985"
TL;DR: Measurements of the branching ratios of ten Cabibbo-suppressed hadronic weak decays of the D/sup +/ and D/Sup 0/ are presented from data collected with the Mark III detector SPEAR.
Abstract: Measurements of the branching ratios of ten Cabibbo-suppressed hadronic weak decays of the D/sup +/ and D/sup 0/ are presented from data collected with the Mark III detector SPEAR. In addition to the previously observed channels D/sup 0/..-->..K/sup -/K/sup +/ and ..pi../sup -/..pi../sup +/, we report new measurements of D/sup 0/..--> pi../sup -/..pi../sup +/..pi../sup 0/ and ..pi../sup -/..pi../sup +/..pi../sup -/..pi../sup +/, and D/sup +/..-->..K/sup 0/K/sup +/, ..pi../sup 0/..pi../sup +/, K-bar/sup asterisk0/(892)K/sup +/, phi..pi../sup +/, K/sup -/K/sup +/..pi../sup +/, and ..pi../sup -/..pi../sup +/..pi../sup +/.
37 citations
TL;DR: In this article, the authors present evidence for the radiative decay J/\ensuremath{\psi}\ensure-math{\rightarrow}\enuremath{-rightarrow}ensure)-math{\gamma},ensure -gamma,ensure −omega{-omega} with a branching fraction of (1.76\ifmmode\pm\else\textpm\fi{}0.09
Abstract: We present evidence for the radiative decay J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\omega}\ensuremath{\omega} with a branching fraction of (1.76\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.45)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$. The \ensuremath{\omega}\ensuremath{\omega} invariant-mass distribution peaks at 1.8 GeV/${c}^{2}$, just above threshold. Analysis of angular correlations indicates that \ensuremath{\omega}\ensuremath{\omega} system below 2 GeV/${c}^{2}$ is predominantly pseudoscalar. Upper limits are presented for the branching fractions of \ensuremath{\omega}\ensuremath{\omega} decays of the \ensuremath{\theta}(1690), the ${g}_{T}$ states near 2.2 GeV/${c}^{2}$, and the ${\ensuremath{\eta}}_{c}$.
28 citations
TL;DR: In this paper, the leptonic branching ratios have been measured to be $B(\ensuremath{\tau}) = 3.77$ GeV and $B(18.5) = 1.0
Abstract: Pairs of $\ensuremath{\tau}$ leptons produced at $\sqrt{s}=3.77$ GeV have been studied in $e\ensuremath{\mu}$, $\mathrm{ee}$, and $\ensuremath{\mu}\ensuremath{\mu}$ final states. The leptonic branching ratios have been measured to be $B(\ensuremath{\tau}\ensuremath{\rightarrow}e\ensuremath{
u}\ensuremath{
u})=(18.2\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.5)%$ and $B(\ensuremath{\tau}\ensuremath{\rightarrow}\ensuremath{\mu}\ensuremath{
u}\ensuremath{
u})=(18.0\ifmmode\pm\else\textpm\fi{}1.0\ifmmode\pm\else\textpm\fi{}0.6)%$. Limits have been set for the two-body decays $\ensuremath{\tau}\ensuremath{\rightarrow}\mathrm{eG}$ and $\ensuremath{\tau}\ensuremath{\rightarrow}\ensuremath{\mu}G$, where $G$ is a light Goldstone boson.
27 citations
1 citations