We present a study of the inclusive photon spectra from 5.9 million J/ψ decays collected with the KEDR detector at the VEPP-4M e＋e collider. We measure the branching fraction of radiative decay J/ψ→ηcγ, ηc widt...We present a study of the inclusive photon spectra from 5.9 million J/ψ decays collected with the KEDR detector at the VEPP-4M e＋e collider. We measure the branching fraction of radiative decay J/ψ→ηcγ, ηc width and mass. Our preliminary results are： M（ηc） = 2979.4± 1.5 ± 1.9 MeV/c^2, Г（ηc） = 27.8±5.1 ±3.3 MeV, B（Jψ→ηcγ） = （2.34±0.15±0.40）%.展开更多
We report results of experiments performed with the KEDR detector at the VEPP-4M e^＋e^- collider. They include precise measurement of the D^0 and D^± meson masses, determination of the ψ（3770） resonance param...We report results of experiments performed with the KEDR detector at the VEPP-4M e^＋e^- collider. They include precise measurement of the D^0 and D^± meson masses, determination of the ψ（3770） resonance parameters, and a search for narrow resonances in e^＋e^- annihilation at center-of-mass energies between 1.85 and 3.1 GeV.展开更多
This paper is devoted to a comprehensive study on a new type of microwave structures named magnetoelectric(ME)gradient structures.These structures are studied in this paper to understand the possibilities and applicat...This paper is devoted to a comprehensive study on a new type of microwave structures named magnetoelectric(ME)gradient structures.These structures are studied in this paper to understand the possibilities and application principles in feasible devices.The structure under study was calculated at different values of the applied electric field and different values of the relative per-mittivity of the artificial dielectric layer.The layered multiferroic structure in inhomogeneous electric and magnetic fields was calculated on the basis of the previously proposed mathematical model.The eigenwaves spectrum for several considered cases was the result of the performed calculation.The concept of using ME gradient structures in the design of electronically controlled microwave devices is formed on the basis of the results of a numerical experiment.Structures of this type will preferably be used in electronically controlled devices for the directional transmission of microwave signals,as it was shown in the theoretical part of the paper.展开更多
基金Supported by the Russian Foundation for Basic Research,grants 08-02-00258,08-02-00258RF Presidential Grant for Sc. Sch. NSh-5655.2008.2
文摘We present a study of the inclusive photon spectra from 5.9 million J/ψ decays collected with the KEDR detector at the VEPP-4M e＋e collider. We measure the branching fraction of radiative decay J/ψ→ηcγ, ηc width and mass. Our preliminary results are： M（ηc） = 2979.4± 1.5 ± 1.9 MeV/c^2, Г（ηc） = 27.8±5.1 ±3.3 MeV, B（Jψ→ηcγ） = （2.34±0.15±0.40）%.
基金Supported by Russian Foundation for Basic Research,Grant 04-02-16712,07-02-00816,07-02-01162RF Presidential Grant for Sc.Sch.NSh-5655.2008.2
文摘We report results of experiments performed with the KEDR detector at the VEPP-4M e^＋e^- collider. They include precise measurement of the D^0 and D^± meson masses, determination of the ψ（3770） resonance parameters, and a search for narrow resonances in e^＋e^- annihilation at center-of-mass energies between 1.85 and 3.1 GeV.
基金The research was carried out at the expense of the grant of the Russian Science Foundation№22-29-00085,https://rscf.ru/project/22-29-00085/.
文摘This paper is devoted to a comprehensive study on a new type of microwave structures named magnetoelectric(ME)gradient structures.These structures are studied in this paper to understand the possibilities and application principles in feasible devices.The structure under study was calculated at different values of the applied electric field and different values of the relative per-mittivity of the artificial dielectric layer.The layered multiferroic structure in inhomogeneous electric and magnetic fields was calculated on the basis of the previously proposed mathematical model.The eigenwaves spectrum for several considered cases was the result of the performed calculation.The concept of using ME gradient structures in the design of electronically controlled microwave devices is formed on the basis of the results of a numerical experiment.Structures of this type will preferably be used in electronically controlled devices for the directional transmission of microwave signals,as it was shown in the theoretical part of the paper.
