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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.
Stdhep File | Ecm(GeV) | Process | Cross-section (fb) | Nevents |
---|---|---|---|---|
ftp://ftp-lcd.slac.stanford.edu/ilc/ILC500/backgrounds/gghad/stdhep/whizard/w15786_01.stdhep | 500 | AA-->hadrons | 4.61E08 | 241,232 |
ftp://ftp-lcd.slac.stanford.edu/ilc/ILC500/backgrounds/ggmumu/stdhep/whizard/w17395_01.stdhep | 500 | AA-->e2E2 | 1.36E09 | 433,931 |