High precision mass measurements in /Ψ and /Υ families revisited

Abstract High precision mass measurements in Ψ and ϒ families performed in 1980–1984 at the VEPP-4 collider with OLYA and MD-1 detectors are revisited. The corrections for the new value of the electron mass are presented. The effect of the updated radiative corrections has been calculated for the J / Ψ (1 S ) and Ψ (2 S ) mass measurements.