For experiments with the SND detector at the electron-positron collider VEPP-2000 a new particle identification system is designed, constructed, and put into operation. The system is designed for the separation of π and K mesons up to particle energy of 1 GeV, in the case of dense aerogel with a refractive index n = 1.13, and e/π-separation energy up to 0.45 GeV, in the case of the aerogel with n = 1.05. Cherenkov radiator is dense aerogel with a refractive index n = 1.13. Structurally, the system has the form of a barrel, divided into 9 sections in the axial angle. Light collection is implemented through green wave length shifter on the flat PMT with micro channel plate. MIP particle creates a signal 6—10 photoelectrons. The system was calibrated on the e, μ, π and K particles produced in e+e– —collisions. The present report is a preliminary result on the measurement cross-section of the process e+e– → K+K– .
|quote your primary experiment||Spherical neutral detector|