Study of conversion decays φ→ηe+e−, η→e+e−γ and η→π+π−e+e− at CMD-2

Abstract Using 15.1 pb −1 of data collected by CMD-2 in the φ -meson energy range, the branching ratios of the following conversion decays have been measured: B ( φ → ηe + e − )=(1.14±0.10±0.06)×10 −4 , B ( η → e + e − γ )=(7.10±0.64±0.46)×10 −3 , B ( η → π + π − e + e − )=(3.7 +2.5 −1.8 ±0.3)×10 −4 . The upper limits for the following rare conversion decays have been obtained at the 90% confidence level: B ( φ → ημ + μ − ) −6 , B ( η → e + e − e + e − ) −5 .