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There are, indeed, some kinematical cuts for processes with divergent cross-sections, which can be seen by looking at the whizard.in file as described above. However, the only kinematic cut that leads to a genuine loss of events is a 4 GeV minimum invariant mass cut on final state fermion-antifermion pairs.

Beam-Beam Background Stdhep Files

Beam-beam background processes are extremely large cross-section process such as AA -> e1E1, AA> e2E2, and AA-> hadrons where the AA center-of-mass energy goes all the way down to threshold. The photons can be either beamstrahlung or Weiszacker-Williams. All Beam-Beam background Stdhep files are unweighted.