Systematics Effects in $Z'$ Searches at the NLC
  We investigate the incidence of several systematic effects on the $Z'$ discovery limits of the NLC. These include the initial state radiation and the systematic errors due to the imperfect polarization measurement, the finite detector angular resolution and the uncertainty on the integrated luminosity. We focus on three reactions involving leptonic couplings: muon pair production, Bhabha scattering and M\o ller scattering. 
Frank Cuypers (PSI)