Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session H10: Production Studies in e+e- Collisions |
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Sponsoring Units: DPF Chair: Bruce Berger, Lawrence Berkeley National Laboratory Room: Hyatt Regency Dallas Cumberland C |
Sunday, April 23, 2006 8:30AM - 8:42AM |
H10.00001: Dipion Transitions from $\Upsilon(3S)$ and $\Upsilon(2S)$ Todd Pedlar The CLEO experiment has collected 5.8 million $\Upsilon(3S)$ and 7.8 million $\Upsilon(2S)$ decays. We report recent results of measurements of both charged and neutral two-pion transitions: $\Upsilon(3S)\rightarrow\Upsilon(2S)\pi\pi$, $\Upsilon(3S)\rightarrow\Upsilon(1S)\pi\pi$ and $\Upsilon(2S)\rightarrow\Upsilon(1S)\pi\pi$. Branching ratios for these transitions, two-pion invariant mass distributions, and angular distributions of the pions will be presented. [Preview Abstract] |
Sunday, April 23, 2006 8:42AM - 8:54AM |
H10.00002: Exclusive $\chi_c$ decays to multibody final states Rukshana Patel Using a 3.08 million data sample obtained at the $\psi(2S)$ resonance collected by the CLEO detector, we measure exclusive hadronic decays of the P-wave spin-triplet charmonium states $\chi_{cJ} $, where $J=0,1,2 $, into multibody final states involving one or more neutral mesons. Such decay rates may provide some hint on the decay patterns of glueball states, and help to test perturbative QCD. [Preview Abstract] |
Sunday, April 23, 2006 8:54AM - 9:06AM |
H10.00003: Studies of $e^+e^-$ annihilations into vector-vector final states Kai Yi The observation of the exclusive reaction $e^+e^-\rightarrow \phi \rho$ will be reported. The final state C-parity configuration and the production angle distribution suggest that this is produced through a two-virtual-photon annihilation process. The cross section for this process at $\sqrt s=10.58~GeV $ based on approximately $230~{\rm fb}^{- 1}$ of BaBar data will be reported. We also report results of searches for other exclusive processes, such as $e^+e^-\rightarrow \phi \phi$, in the same data set. [Preview Abstract] |
Sunday, April 23, 2006 9:06AM - 9:18AM |
H10.00004: Measurement of Upper Limits for $\Upsilon\to \gamma + {\cal R}$ Decays Shawn Henderson Using data collected from the CLEO III detector at the Cornell Electron Storage Ring, we report on a new study of exclusive radiative decays of the $\Upsilon$ resonances into two-body final states ${\cal R}\gamma$, with ${\cal R}$ some resonant hadronic state. We present preliminary upper limits for these $\Upsilon({\rm 1S})$, $\Upsilon({\rm 2S})$, and $\Upsilon({\rm 3S})$ two-body decays as a function of $\gamma$ energy. Additionally, we place upper limits on two-body final states of continuum $q{\overline q}$ decays for center-of-mass energies just below the $\Upsilon({\rm 1S})$, $\Upsilon({\rm 2S})$, and $\Upsilon({\rm 3S})$ energies. [Preview Abstract] |
Sunday, April 23, 2006 9:18AM - 9:30AM |
H10.00005: Comparisons of Exact Results for the Virtual Photon Contribution to Single Hard Bremsstrahlung in Radiative Return for Electron-Positron Annihilation Scott Yost, B.F.L. Ward, Stanislaw Jadach We compare fully differential exact results for the virtual photon correction to single hard photon bremsstrahlung obtained using independent calculations, both for $e^+e^-$ annihilation at high-energy colliders and for radiative returnapplications. The results are compared using Monte Carlo evaluations of the matrix elements as well as by direct analytical evaluation of certain critical limits. Special attention is given to the issues of numerical stability and the treatment of finite-mass corrections. It is found that agreement on the order of $10^{-5}$ or better is obtained over most of the range of hard photon energies, at CMS energies relevant to both high energy collisions and radiative return experiments. [Preview Abstract] |
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