Description
Running the ffbar process:
k4GeneratorsConfig share/ECFAHiggsFactories/ffbar/ffbar.yaml --ecmsFiles share/ECFAHiggsFactories/ffbar/ecmsffbar.yaml
The comparison for the muon neutrino process (no ISR, LO):
MuonNeutrino_91200 sqrts= 91.2:
Madgraph 3946.1 +- 2.12004e-05 pb
Pythia 3950.92 +- 0 pb
Sherpa 3949.85 +- 0.830024 pb
Whizard 3949.82 +- 0.465203 pb
MuonNeutrino_150000 sqrts= 150:
Madgraph 2.7465 +- 1.19575e-08 pb
Pythia 2.7924 +- 1.55264e-08 pb
Sherpa 2.74942 +- 0.000578213 pb
Whizard 2.74835 +- 0.000321437 pb
MuonNeutrino_200000 sqrts= 200:
Madgraph 0.97874 +- 3.56797e-09 pb
Pythia 1.0022 +- 0 pb
Sherpa 0.784725 +- 0.00350383 pb
Whizard 0.979436 +- 0.000114831 pb
MuonNeutrino_350000 sqrts= 350:
Madgraph 0.23089 +- 0 pb
Pythia 0.239463 +- 0 pb
Sherpa 0.231004 +- 4.86866e-05 pb
Whizard 0.230984 +- 2.70002e-05 pb
good agreement between Sherpa, Whizard and Madgraph.
The issue is at sqrts=200GeV: Sherpa is way off.
The only difference between all configuration files is sqrts and there is only a single process (Z exchange)