43,075 research outputs found
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
Full text linkFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Consideration of the Near-Fault Effect on Seismic Design Code for Sites Near the Chelungpu Fault
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The CHAI libraries
No full textAbstract. In this paper we present CHAI, a set of haptic/graphics C++ libraries that were developed in the last years by a varied group of researchers. The CHAI libraries allow both high level and low level programming of haptic applications. Users that are not interested in implementation details can easily build visual-haptic scenes using a large set of pre-implemented algorithms. However, differently from other existing haptic libraries, the CHAI libraries allow users to tweak with low level details, such as changing the control algorithms for supported devices or adding new custom devices. CHAI is a growing project, one featuring the efforts of many researchers around the world. A steering committee will periodically review any proposed addition to the libraries and publish new extended releases. Some demos created using CHAI, as well as the main features of the libraries, will be demonstrated during Eurohaptics demo session. In such occasions CD-ROMs containing the latest release of CHAI, as well as its documentation, will be freely handed out to anyone who is interested.
Propagation of surface waves in anisotropic solids: theoretical calculation and experiment
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