In the SND experiment at VEPP-2M e^+e^- collider the phi(1020) ---> eta+gamma ---> 3pi^0+gamma decay was studied. The branching ratio B(phi--->eta+gamma) = (1.246 +- 0.025 +- 0.057)% was measured.
The processes \(e^+e^-\to\mu^+\mu^-\) and \(e^+e^-\to\pi^+\pi^-\) have been studied with SND detector at VEPP-2M \(e^+e^-\) collider in the vicinity of \(\phi(1020)\) resonance. The branching ratios ...\(B(\phi\to\mu^+\mu^-)=(3.30\pm 0.45\pm 0.32)\times 10^{-4}\) and \(B(\phi\to\pi^+\pi^-)=(0.71\pm 0.11\pm 0.09)\times 10^{-4}\) were obtained.
The new data on \(\rho,\omega,\phi\) radiative decays into \(\pi^0\gamma,\eta\gamma,\eta'\gamma\) from SND experiment at VEPP-2M \(e^+e^-\) collider are presented.
The current status of experiments with SND detector at VEPP-2M e^+e^- collider in the energy range 2E_0=400-1400 MeV and recent results of data analysis for \(\phi\), \(\omega\) and \(\rho\) decays ...and e^+e^- annihilation into hadrons are presented.
In the experiment with the SND detector at VEPP-2M e^+e^- collider the process \(e^+e^-\to\pi^+\pi^-\pi^0\) was studied in the energy range 2E_0 from 1.04 to 1.38 GeV. A broad peak was observed with ...the visible mass \(M_{vis}=1220\pm 20\) MeV and cross section in the maximum \(\sigma_0\simeq 4\) nb. The peak can be interpreted as a \(\omega\)-like resonance \(\omega (1200)\).
The Spherical Neutral Detector (SND) operates at VEPP-2M collider in Novosibirsk studying e^+e^- annihilation in the energy range up to 1.4 GeV. Detector consists of a fine granulated spherical ...scintillation calorimeter with 1632 NaI(Tl) crystals, two cylindrical drift chambers with 10 layers of sense wires, and a muon system made of streamer tubes and plastic scintillation counters. The detector design, performance, data acquisition and processing are described.
SND (Spherical Neutral Detector) is a general purpose nonmagnetic detector, successfully operating at Novosibirsk VEPP-2M collider during last four years in the center of mass energy range from 400 ...MeV up to 1400 MeV. Its crucial part is a 3-layer, fine grained, spherical NaI(Tl) electromagnetic calorimeter consisted of 1632 individual counters. Here we present a detailed description of the calorimeter and its performance, including such topics as calorimeter design, electronics, calibration, energy and spatial resolutions, particle identification. The calorimeter performance is illustrated by examples from the current studies of different physical processes.
In the SND experiment at the VEPP-2M electron-positron collider the PHI(1020)--->PI0+PI0+GAMMA decay was studied. The branching ratio B(PHI--->PI0+PI0+GAMMA)=(1.14+-0.10+-0.12)x10^{-4} was measured. ...It was shown, that the F0(980)GAMMA mechanism dominates in this decay and the 4-quark model of F0(980) describes our data most consistently.
