Gao Peng Chen

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BABAR, the detector for the SLAC PEP-II asymmetric eþe B Factory operating at the Uð4SÞ resonance, was designed to allow comprehensive studies of CP-violation in B-meson decays. Charged particle tracks are measured in a multi-layer silicon vertex tracker surrounded by a cylindrical wire drift chamber. Electromagnetic showers from electrons and photons are(More)
We have measured the branching fraction and photon energy spectrum for the radiative penguin process b → sγ. We find B(b → sγ) = (3.21 ± 0.43 ± 0.27 −0.10) × 10 , where the errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, 〈Eγ〉 = 2.346± 0.032± 0.011 GeV, and 〈E(More)
The generation of naturally-sounding F0 contours in TTS enhances the intelligibility and perceived naturalness of synthetic speech. In earlier works the first author developed a linguistically motivated model of German intonation based on the quantitative Fujisaki model of the production process of F0, and an automatic procedure for extracting the(More)
The branching fractions of the exclusive decays B0-->K(*0)gamma and B+-->K(*+)gamma are measured from a sample of (22.74+/-0.36)x10(6) BB decays collected with the BABAR detector at the PEP-II asymmetric e(+)e(-) collider. We find B (B0-->K(*0)gamma) = [4.23+/-0.40(stat)+/-0.22(syst)]x10(-5), B(B+-->K(*+)gamma) = [3.83+/-0.62(stat)+/-0.22(syst)]x10(-5) and(More)
The paper presents the application of the trainable SFC superpositional prosodic model to Chinese. Within the SFC model, prosodic parameters (F0, syllabic lengthening) are interpreted as the superposition of overlapping multiparametric contours. These contours are associated with high-level prosodic features operating at different scopes, such as tones,(More)
BES data on J/ψ → γ(KKππ) are presented. The KK̄ contribution peaks strongly near threshold. It is fitted with a broad 0 resonance with mass M = 1800 ± 100 MeV, width Γ = 500 ± 200 MeV. A broad 2 resonance peaking at 2020 MeV is also required with width ∼ 500 MeV. There is further evidence for a 2 component peaking at 2.55 GeV. The non-KK̄ contribution is(More)
We report a new measurement of the Cabibbo-Kobayashi-Maskawa parameter Vub made with a sample of 9.7 x 10(6) BB- events collected with the CLEO II detector. Using heavy quark theory, we combine the observed yield of leptons from semileptonic B decay in the end-point momentum interval 2.2-2.6 GeV/c with recent CLEO II data on B-->X(s)gamma to find Vub =(More)
A preliminary study of time dependence of BB oscillations using dilepton events is presented. The avor of the B meson is determined by the charge sign of the lepton. To separate signal leptons from cascade and fake leptons we have used a method which combines several discriminating variables in a neural network. The time evolution of the oscillations is(More)
We have searched a sample of 9.6 million BB̄ events for the lepton-flavorviolating decays B → heμ, B+ → h−e+e+, B+ → h−e+μ+, and B+ → h−μ+μ+, where h is π, K, ρ, and K(892), a total of sixteen modes. We find no evidence for these decays, and place 90% confidence level upper limits on their branching fractions that range from 1.0 to 8.3× 10−6. Typeset using(More)