SND Experiment

• from 1995 to 2000 - data collection at the e⁺e⁻ storage ring in the energy range 2E=0.4-1.4 GeV,
• from 2001 to 2008 - and the storage ring to VEPP-2000,
• from 2009 - data collection at the e⁺e⁻ storage ring in the energy range 2E=1.0-2.0 GeV.

  Physics

• quark structure of the light scalar mesons can be studied in electric-dipole radiative decays ;
• precise measurement of the e⁺e⁻annihilation cross section into hadrons is the important component in definition of the muon anomalous magnetic dipole moment;
• precise measurement of the hadronic cross sections is necessary to study the radial excitation of the light vector mesons ρ, ω, and φ;
• measurement of the higher order quantum electrodynamic processes is important for the QED theory test.

• the solid angle is covered up to 96% of 4π sr,
• the NaI calorimeter has uniform spherical shape with fine segmentation in azimuthal and polar angles and 3 layers in radial direction,
• drift chamber is used as a central tracker,
• external anti-coincidence flat scintillation counters are enhanced by the coordinate system made of arrays of strimmer tubes.

  Experimental program

• Radiative decays
• OZI and G-parity suppressed decays
• Electromagnetic decays
• e⁺e⁻ annihilation into hadrons
• Test of QED processes
• Search for rare decays
• Search for C-even reactions

  Detector

Results