Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session I10: Charm Production, Decay, and Excited States |
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Sponsoring Units: DPF Chair: Gregory Dubois-Felsmann, California Institute of Technology Room: Hyatt Regency Dallas Cumberland C |
Sunday, April 23, 2006 10:30AM - 10:42AM |
I10.00001: $D$ hadronic branching fractions Steven Stroiney The CLEO-c experiment at the CESR $e^+ e^-$ collider has collected 281 pb$^{-1}$ of data at the $\psi(3770)$ resonance, producing 1 million $D^0 \overline{D}^0$ and 0.8 million $D^+ D^-$ events. By exploiting the pair production of these charmed mesons, we can determine their absolute hadronic branching fractions without using the luminosity of the sample. We have previously measured branching fractions for the $D^0$ and $D^+$ from 56 pb$^{-1}$ of data; here we report preliminary updates to these measurements from the 281 pb$^{-1}$ sample now available. [Preview Abstract] |
Sunday, April 23, 2006 10:42AM - 10:54AM |
I10.00002: D Meson Decays into $\phi$, $\eta$ and $\eta'$ Radia Sia We report on inclusive and exclusive decays of charmed mesons into particles that have a large content of $s\overline{s}$ quarks, namely the $\phi$, $\eta$ and $\eta'$. Data taken with the CLEO detector in the energy region where correlated $D\overline{D}$ pairs are produced are used, where one $D$ meson is fully reconstructed and then the properties of the other $D$ are examined. These measurements are particularly useful for ascertaining the properties of $B$ meson decays. [Preview Abstract] |
Sunday, April 23, 2006 10:54AM - 11:06AM |
I10.00003: Hadronic $D_s$ decays Peter Onyisi The CLEO-c experiment at the CESR $e^+ e^-$ collider has collected a large sample of $D_s^\pm D_s^{\mp *}$ events at $E_{cm} \sim 4.17$~GeV. By exploiting the pair production of these charmed mesons, we can determine their absolute hadronic branching fractions without reference to the total luminosity of the sample. Here we report preliminary measurements of major $D_s^+$ hadronic branching fractions, in particular ${\mathcal B}(D_s^+ \to \phi \pi^+)$. [Preview Abstract] |
Sunday, April 23, 2006 11:06AM - 11:18AM |
I10.00004: Measurement of Charm-Production Cross Sections in \(e^{+}e^{-}\) Annihilations at Center-of-Mass Energies Between 3.97 and 4.26GeV Brian Lang Using the CLEO-c detector at the Cornell Electron Storage Ring, we have measured charmed-hadron production cross sections for $e^{+}e^{-}$ annihilations at twelve center-of-mass energies between 3.97 and 4.26~GeV. Observed cross sections for the final states $D\bar{D}$, $D^{*}\bar{D}$, $D^{*}\bar{D}^{*}$, $D_{s}\bar{D}_{s}$, $D_{s}^{*}\bar{D}_{s}$, and $D_{s}^{*}\bar{D}_{s}^{*}$ are presented, as well as the total charm cross section. Observed cross sections have been radiatively corrected to obtain tree-level cross sections and $R$. [Preview Abstract] |
Sunday, April 23, 2006 11:18AM - 11:30AM |
I10.00005: Measurement of the Branching Fraction for B$_{s} \rightarrow D_{s1}^{\pm}$(2536) $\mu \nu X\:$ at D\O Jason Rieger The orbitally excited charm state ${D}_{s1}^{\pm}(2536)$ has been observed at D\O\ in the decay channel ${B}_{s} \rightarrow {D}_{s1}^{\pm}(2536) \mu \nu {X} \:$ with ${D}_{s1}^{\pm}(2536) \rightarrow {D}^{* \pm} K^0_S \:$. The ${D}_{s1}^{\pm}(2536)\:$ mass peak is presented with a signal significance of greater than 5.0$\sigma$ and the branching fraction for the semileptonic decay to this state is measured in approximately 1~fb$^{-1}$ of data. [Preview Abstract] |
Sunday, April 23, 2006 11:30AM - 11:42AM |
I10.00006: Studies of the X(3872) Alexandre Rakitine We investigate the puzzling nature of the state $X(3872)$ using data obtained with the CDF\,II detector at the Fermilab Tevatron Collider. The shape of the dipion mass spectrum in $X(3872)\to\,J/\psi\,\pi^+\pi^-$ decay is compared to theoretical predictions for the dipion spin-parity $0^{++}$ and $1^{--}$. For $0^{++}$ case, the QCD multipole expansion for charmonium is used, and only $^3S_1$ state is found to be compatible with data. There is, however, no $^3S_1$ charmonium state available for assignment to the $X(3872)$. For the $1^{--}$ case the hypothesis $X(3872)\to\,J/\psi\rho^0$ is tested and found to be compatible with the data. [Preview Abstract] |
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