The BABAR Collaboration BABAR, the detector for the SLAC PEP-II asymmetric e + e − B Factory operating at the Υ (4S) resonance, was designed to allow comprehensive studies of CP -violation in B-meson decays. Charged particle tracks are measured in a multi-layer silicon vertex tracker surrounded by a cylindrical wire drift chamber. Electromagnetic showers from electrons and photons are detected in an array of CsI crystals located just inside the solenoidal coil of a superconducting magnet. Muons and neutral hadrons are identified by arrays of resistive plate chambers inserted into gaps in the steel flux return of the magnet. Charged hadrons are identified by dE/dx measurements in the tracking detectors and in a ring-imaging Cherenkov detector surrounding the drift chamber. The trigger, data acquisition and data-monitoring systems , VME-and network-based, are controlled by custom-designed online software. Details of the layout and performance of the detector components and their associated electronics and software are presented.

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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,