Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session Y7: Particle Decays II |
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Sponsoring Units: DPF Chair: Steve Nahn, Yale University Room: Marriott Tampa Waterside Room 1 |
Tuesday, April 19, 2005 1:30PM - 1:42PM |
Y7.00001: Recent Results from Besii $\psi(2S)$ Data Zijin Guo Recent results will be reported based on analyses using sample of 14 million $\psi(2S)$ events collected with the BESII detector at the BEPC, including $\chi_{c0}\to f_0(980)f_0(980)$, $\chi_{c0,1,2} \to K^*(892)\bar K^*(892)$, $\chi_{c0,2}\to \omega\omega$ and $\chi_{cJ}$ mass and width measurement with $\gamma$ conversion, and a study of $\psi(2S)\to \pi^0 (\eta) p \bar p$. [Preview Abstract] |
Tuesday, April 19, 2005 1:42PM - 1:54PM |
Y7.00002: Search for Psi(3770) Decays into non D-Dbar States Rukshana Patel \begin{document} Using a data sample of 60~pb$^{-1}$ taken by the CLEO-c detector operating at the Cornell Electron Storage Ring, we present new results on a search for $\psi(3770)$ decays into non D-Dbar states. \end{document} [Preview Abstract] |
Tuesday, April 19, 2005 1:54PM - 2:06PM |
Y7.00003: Study of $\psi(3686)$ Decays to $K^+K^-$ and baryon anti-baryon John Yelton \begin{document} Using 3.05 Million $\psi(3686)$ decays from the CLEO III and CLEO-c data samples, we have made improved measurements of the $\psi(3686)$ decaying to baryon and anti-baryon and $K^+K^-$ final states. We present results on nine modes: the world's most precise measurements of $K^+K^-$, $p\overline{p}$, $\lambda\overline{\lambda}$, $\Xi^-\overline{\Xi^-}$, $\Xi^0\overline{\Xi^0}$, the first observations of, $\Xi^0\overline{\Xi^0}$, and signals of marginal significance in $\Xi^{*0}\overline{\Xi^{*0}}$ and $\Omega^-\overline{\Omega^-}$. \end{document} [Preview Abstract] |
Tuesday, April 19, 2005 2:06PM - 2:18PM |
Y7.00004: Radiative transitions from $\psi(3770) \to \chi_{cJ}$ Jamila Butt \begin{document} We present preliminary measurements of branching ratios for $\psi(3770)\to\gamma\chi_{cJ}$ using CLEO-c data. \end{document} [Preview Abstract] |
Tuesday, April 19, 2005 2:18PM - 2:30PM |
Y7.00005: Evidence for the Decay $\Sigma^+ \rightarrow p \mu^+ \mu^-$ Edmond Dukes The HyperCP (E871) experiment collected $\sim$\ $10^{10}$ hyperon decays in the 1997 and 1999 Fermilab fixed-target running periods. Using the data from the 1999 run, we report on the observation of three isolated events with reconstructed masses consistent with the hypothesis $\Sigma^+ \rightarrow p~\mu^+~\mu^- $. This is the rarest decay ever observed in the baryon sector. The dimuon mass distribution is unexpectedly narrow, suggesting that the decay may proceed via an intermediate state of mass $214.3{\pm}0.5$\,MeV/$c^2$. Possible interpretations of the observed events will be discussed including the decay of an sgoldstino-like particle. [Preview Abstract] |
Tuesday, April 19, 2005 2:30PM - 2:42PM |
Y7.00006: Observation of $\Omega_{c}^{0}$ in E781(SELEX) Experiment at Fermilab Ahmet Ayan We report the observation of 107 $\pm$ 22 $\Omega_{c}^{0}$ events in $\Omega^{-} \pi^{-} \pi^{+} \pi^{+}$, $\Omega^{-} \pi^{+}$, and $\Xi^{-} K^{-} \pi^{+} \pi^{+}$ decay modes. The data were taken by the SELEX experiment (E781) spectrometer using 600 GeV/$c$ $\Sigma ^{-}$, $\pi ^{-}$ and 540 GeV/c $p$ beams. The mass of the $\Omega_{c}^{0}$ is measured to be $2706.6 \pm 2.0 \pm 2.1$, using the three decay modes. [Preview Abstract] |
Tuesday, April 19, 2005 2:42PM - 2:54PM |
Y7.00007: Studies of the $X(3872)$ Isaac Hall The true nature of the $X(3872)$ continues to be a mystery. Various possibilities exist and further experimental studies are necessary to determine which description is correct. We present our latest measurements on the $X(3872)$ from data collected using the D{\O} detector. [Preview Abstract] |
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