Showing papers by "Konstantin Beloborodov published in 2013"
TL;DR: In this article, the vector meson dominance model with two excited states was used to extract the transition form factor of the center-of-mass energy range 105--200 GeV.
Abstract: The cross section for the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ has been measured in the center-of-mass energy range 105--200 GeV The experiment has been performed at the ${e}^{+}{e}^{\ensuremath{-}}$ collider VEPP-2000 with the SND detector The measured ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0}$ cross section above 14 GeV is the most accurate to date Below 14 GeV our data are in good agreement with the previous SND and CMD-2 measurements Data on the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0}$ cross section are well described by the vector meson dominance model with two excited $\ensuremath{\rho}$-like states From the measured cross section we have extracted the ${\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0}$ transition form factor It has been found that the vector meson dominance model cannot describe simultaneously our data and data obtained from the $\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decay We have also tested the conserved vector current hypothesis comparing our results on the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0}$ cross section with data on the ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{
u}}_{\ensuremath{\tau}}$ decay and have found that the conserved vector current hypothesis works well within the reached experimental accuracy of about 5%
34 citations
21 Dec 2013-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a threshold Cherenkov counter based on dense aerogel with refraction index n = 1.13 was used for kaon identification at momenta below 1 ǫ/c in the SND detector, which takes data at the VEPP2000 e + e − collider.
Abstract: A threshold Cherenkov counter based on dense aerogel with refraction index n =1.13 is described. This counter is used for kaon identification at momenta below 1 GeV/ c in the SND detector, which takes data at the VEPP-2000 e + e − collider. The results of measurements of the counter efficiency using electrons, muons, pions, and kaons produced in e + e − annihilation are presented.
10 citations