نتایج جستجو برای: electrical resonance
تعداد نتایج: 387783 فیلتر نتایج به سال:
We show that the Flatté formula is not adequate to interpret precision data on a resonance production near an inelastic threshold. A unitary parameterization, satisfying generalized Watson’s theorem for the production amplitudes, is proposed to replace the Flatté parameterization in the phenomenological analyses of the experimental data.
We derive a single-channel effective K̄N interaction from chiral SU(3) coupledchannel dynamics, emphasizing the important role of the πΣ channel and the structure of the Λ(1405) resonance. The chiral low energy theorem requires strongly attractive interaction not only in the K̄N channel but also in the πΣ channel. As a consequence of the strong πΣ dynamics, the equivalent potential in single K̄N c...
Using a sample of 58× 106 J/ψ events collected with the BESII detector, radiative decays J/ψ → γγV , where V = ρ or φ, are studied. A resonance around 1420 MeV/c2 (X(1424)) is observed in the γρ mass spectrum. Its mass and width are measured to be 1424 ± 10 (stat) ± 11 (sys) MeV/c2 and 101.0 ± 8.8 ± 8.8 MeV/c2, respectively, and its branching ratio B(J/ψ → γX(1424) → γγρ) is determined to be (1...
Abstract We derive expressions for pion photoproduction amplitudes in the 1/Nc expansion of QCD, and obtain linear relations directly from this expansion that relate electromagnetic multipole amplitudes at all energies. The leading-order relations in 1/Nc compare favorably with available data, while the next-to-leading order relations seem to provide only a small improvement. However, when reso...
A test technique for capacitive MEMS accelerometers and electrostatic microactuators, based on the measurement of pull-in voltages and resonance frequency, is described. Using this combination of measurements, one can estimate process-induced variations in the device layout dimensions as well as deviations from nominal value in material properties, which can be used either for testing or device...
Our contribution to the Eta’05 workshop on “Production and Decay of η and η Mesons” (1518.9.2005, Cracow, Poland) is summarized. First we discuss open questions in the theoretical treatment of Coulomb-interaction in the context of reaction processes like pp → ppη. Then we review η-η and σ(600)-f0(980) mixing in the U(3)×U(3) Linear Sigma Model and extract information on η-η mixing and the K 0 (...
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