The review of experimental results obtained with SND detector at VEPP-2M e + e − collider in the energy region √ s = 0.36 -1.38 GeV is given. The presented results include the following items: studies of the light vector mesons radiative decays, OZI-rule and G-parity suppressed φ-meson rare decays, φ-meson parameters measurements, studies of e + e − → π + π − π 0 process dynamics, η and KS mesons rare decays, η and φ mesons conversion decays, and study of the e + e − annihilation into hadrons.The Spherical Neutral Detector (SND) operated since 1995 up to 2000 at VEPP-2M [1] e + e − collider in the energy range from 0.36 to 1.38 GeV. SND was described in detail in Ref. [2]. During six experimental years SND had collected data with integrated luminosity about 30 pb −1 .
Radiative decays of the φ, ω, ρ mesonsElectric dipole transitions of the φ meson. Till recently φ meson electric dipole transitions were not observed. A search for such decays was first performed with ND detector at VEPP-2M and the upper limits of about 10 −3 were obtained [3]. About the same time the theoretical proposal of the φ → f 0 γ,
We reexamine the problem of simultaneously describing in a consistent way all radiative and leptonic decays of light mesons (V→ P␥, P→V␥, P→␥␥, V→e ϩ e Ϫ ). For this purpose, we rely on the hidden local symmetry model in both its anomalous and non-anomalous sectors. We show that the SU͑3͒ symmetry breaking scheme proposed by Bando, Kugo and Yamawaki, supplemented with nonet symmetry breaking in the pseudoscalar sector, allows one to reach a nice agreement with all data, except for the K* Ϯ radiative decay. An extension of this breaking pattern allows one to account for this particular decay mode too. Considered together, the whole set of radiative decays provides a pseudoscalar mixing angle P ӍϪ11°and a value for V which is Ӎ3°from that of ideal mixing. We also show that it is impossible, in a practical sense, to disentangle the effects of nonet symmetry breaking and those of glue inside the Ј, using only light meson decays.
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