2,454 research outputs found

    Equivalent-Layer Method for Optical Waveguides with a Multi-Quantum-Well Structure

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    An equivalent-layer method for analyzing multiple-quantum-well (MQW) waveguides is presented. This method not only allows the whole waveguide to be treated as a three-layer waveguide but offers exact solutions for the propagation constant of MQW waveguides and the power confinement factor within the MQW structure as well. A comparison between this method and two other three-layer models is given

    The traveling-wave V-antenna

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    Combination resonant V-antenna and traveling-wave dipole antenn

    Analyzing eta' photoproduction data on the proton at energies of 1.5--2.3 GeV

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    The recent high-precision data for the reaction γppη\gamma p\to p\eta' at photon energies in the range 1.5--2.3 GeV obtained by the CLAS collaboration at the Jefferson Laboratory have been analyzed within an extended version of the photoproduction model developed previously by the authors based on a relativistic meson-exchange model of hadronic interactions [Phys. Rev. C \textbf{69}, 065212 (2004)]. The η\eta' photoproduction can be described quite well over the entire energy range of available data by considering S11S_{11}, P11P_{11}, P13P_{13}, and D13D_{13} resonances, in addition to the tt-channel mesonic currents. The observed angular distribution is due to the interference between the tt-channel and the nucleon ss- and uu-channel resonance contributions. The j=3/2j=3/2 resonances are required to reproduce some of the details of the measured angular distribution. For the resonances considered, our analysis yields mass values compatible with those advocated by the Particle Data Group. We emphasize, however, that cross-section data alone are unable to pin down the resonance parameters and it is shown that the beam and/or target asymmetries impose more stringent constraints on these parameter values. It is found that the nucleonic current is relatively small and that the NNηNN\eta^\prime coupling constant is not expected to be much larger than 2.Comment: Revised version based on revised (finalized) CLAS data (14 pages, 10 figures, RevTeX4

    Experimental studies of the traveling-wave v- antenna and related antennas

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    Traveling wave V-antenna - effect on radiation pattern and V-antennas with more than one set of resistors and arm

    Stochastic Process Associated with Traveling Wave Solutions of the Sine-Gordon Equation

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    Stochastic processes associated with traveling wave solutions of the sine-Gordon equation are presented. The structure of the forward Kolmogorov equation as a conservation law is essential in the construction and so is the traveling wave structure. The derived stochastic processes are analyzed numerically. An interpretation of the behaviors of the stochastic processes is given in terms of the equation of motion.Comment: 12 pages, 9 figures; corrected typo

    Comment on "Valence QCD: Connecting QCD to the Quark Model"

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    I criticize certain conclusions about the physics of hadrons drawn from a "valence QCD" approximation to QCD.Comment: 12 pages, 8 figures; some minor improvements made to the tex

    Exclusive ϕ\phi production in proton-proton collisions in the resonance model

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    The exclusive ϕ\phi meson production in proton-proton reactions is calculated within the resonance model. The considered model was already successfully applied to the description of π\pi, η\eta, ρ\rho, ω\omega, ππ\pi\pi production in proton-proton collisions. The only new parameter entering into the model is the ωϕ\omega-\phi mixing angle θmix\theta_{mix} which is taken equal to θmix3.7o\theta_{mix} \approx 3.7^o.Comment: 7 pages, 1 figure, to appear in the brief report section of PR
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