Using the KEDR detector at the VEPP-4M \(e^+e^-\) collider, we have measured the values of \(R_{\text{uds}}\) and \(R\) at seven points of the center-of-mass energy between 3.12 and 3.72 GeV. The ...total achieved accuracy is about or better than \(3.3\%\) at most of energy points with a systematic uncertainty of about \(2.1\%\). At the moment it is the most accurate measurement of \(R(s)\) in this energy range.
Using the inclusive photon spectrum based on a data sample collected at the \(J/\psi\) peak with the KEDR detector at the VEPP-4M \(e^+e^-\) collider, we measured the rate of the radiative decay ...\(J/\psi\to\gamma\eta_{\rm c}\) as well as \(\eta_{\rm c}\) mass and width. Taking into account an asymmetric photon lineshape we obtained \(\Gamma^0_{\gamma\eta_{\rm c}}=2.98\pm0.18 \phantom{|}^{+0.15}_{-0.33}\) keV, \(M_{\eta_{\rm c}} = 2983.5 \pm 1.4 \phantom{|}^{+1.6}_{-3.6}\) MeV/\(c^2\), \(\Gamma_{\eta_{\rm c}} = 27.2 \pm 3.1 \phantom{|}^{+5.4}_{-2.6}\) MeV.
The ratio of the electron and muon widths of the \(J/\psi\) meson has been measured using direct \(J/\psi\) decays in the KEDR experiment at the VEPP-4M electron-positron collider. The result ...\(\Gamma_{ee}(J/\psi)/\Gamma_{\mu\mu}(J/\psi)=1.0022\pm0.0044\pm0.0048\ (0.65\%)\) is in good agreement with the lepton universality. The experience collected during this analysis will be used for a \(J/\psi\) lepton width determination with up to 1% accuracy.
The proposed approach makes possible the simultaneous solution of the problems of recognizing and determining the orientation of planar objects by robot-vision systems. The approach involves the ...search for a characteristic point on the basis of values of invariant functions, computed according to the coordinates of circuit points. Results of computer simulation are presented. (B.J.)
Low temperature ESR spectra of gamma-irradiated samples of mouse liver regenerating after partial hepatectomy were studied. As compared to ESR spectra of gamma-irradiated samples of health animals ...liver, in regenerating liver samples new ESR signals from paramagnetic centres S(2.0005) and S(2.0025) were revealed; these signals were earlier recorded by the authors in gamma-irradiated samples of hepatoma 22a. It is concluded that the paramagnetic centres S(2.0005) and S(2.0025) are typical of proliferating tissues of different ethiology.
