Using 9.32, 5.88 million Upsilon(2S,3S) decays taken with the CLEO-III detector, we obtain five product branching fractions for the exclusive processes Upsilon(2S) => gamma chi_{b0,1,2}(1P) => gamma ...gamma Upsilon(1S) and Upsilon(3S) => gamma chi_{b1,2}(1P) => gamma gamma Upsilon(1S). We observe the transition chi_{b0}(1P) => gamma Upsilon(1S) for the first time. Using the known branching fractions for BUpsilon(2S) => gamma chi_{bJ}(1P), we extract values for Bchi_{bJ}(1P) => gamma Upsilon(1S) for J=0, 1, 2. In turn, these values can be used to unfold the Upsilon(3S) product branching fractions to obtain values for BUpsilon(3S) => gamma chi_{b1,2}(1P) for the first time individually. Comparison of these with each other and with the branching fraction BUpsilon(3S) => gamma chi_{b0} previously measured by CLEO provides tests of relativistic corrections to electric dipole matrix elements.
Using 586 \(\textrm{pb}^{-1}\) of \(e^{+}e^{-}\) collision data acquired at \(\sqrt{s}=4.170\) GeV with the CLEO-c detector at the Cornell Electron Storage Ring, we report the first observation of ...\(D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}\) with a significance of \(5.3 \sigma\). The ratio of branching fractions \(\calB(D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}) / \calB(D_{s}^{*+} \to D_{s}^{+} \gamma)\) is measured to be \( 0.72^{+0.15}_{-0.13} (\textrm{stat}) \pm 0.10 (\textrm{syst})%\), which is consistent with theoretical expectations.
We present the first search for the decay \(D^+_{s}\to \omega e^{+}\nu\) to test the four-quark content of the \(D^+_{s}\) and the \(\omega\)-\(\phi\) mixing model for this decay. We use 586 ...\(\mathrm{pb}^{-1}\) of \(e^{+}e^{-}\) collision data collected at a center-of-mass energy of 4170 MeV. We find no evidence of a signal, and set an upper limit on the branching fraction of \(\mathcal{B}(D^+_{s}\to\omega e^+\nu)<\)0.20% at the 90% confidence level.
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