BHAGEN95 - A MONTE-CARLO PROGRAM FOR BHABHA SCATTERING AT LEP1 SLC AND LEP2 ENERGIES/

We present the Monte Carlo program BHAGEN95, for calculating the cross -section of the Bhabha scattering process at LEP1/SLC and LEP2 energie s, usable with continuity from small-to large-angle configurations. We discuss some improvements in the event generator BHAGEN94, which is n ow part of the new code. In particular the weak and QCD corrections ar e implemented up to two loops for the relevant contributions, and the emission of one hard photon is treated exactly. We have included all t he radiative corrections which are necessary to obtain, for a typical experimental event selection, a precision of 0.1-0.2% at small angle. At large angle we estimate a precision of 0.5%, with the exception of the region where the beam energy is a few GeV above the Z-boson resona nce, where it is up to 1%. A detailed comparison with other codes for both small-angle and large-angle Bhabha scattering is performed.