Determination of J/psi Event Number via J/psi -> mu(+)mu(-) and J/psi -> e(+)e(-) at BESIII

The decays of J/psi -> mu(+)mu(-) and J/psi -> e(+)e(-) are studied by Monte-Carlo simulation, based on the Beijing Spectrometer (BES) III offline software system. The methods of determination of the J/psi event number via J/psi -> mu(+)mu(-) and J/psi -> e(+)e(-) are presented, respectively. These methods can be used to determine the J/psi event number for the coming BESIII J/psi data sample.