Separation of $e^+e^-\to e^+e^-$ and $e^+e^-\to\pi^+\pi^-$ events using   SND detector calorimeter
  The technique of discrimination of the $e^+e^-\to e^+e^-$ and $e^+e^-\to \pi^+\pi^-$ events in energy range $0.5 < \sqrt{s} < 1$ GeV by energy deposition in the calorimeter of SND detector was developed by applying machine learning method. Identification efficiency for $e^+e^-\to e^+e^-$ and $e^+e^-\to \pi^+\pi^-$ events in the range from 99.3 to 99.8 % has been achived. 
M.N. Achasov, K.I. Beloborodov, A.S. Kupich
physics.ins-det