How we ran the MC
USECNTRULES T or F = CR or NCR
QDIQSUPP Default 0.15 0.20
HCSIMLEVEL 0 or 1 (shower)
And of course pythia 5 vrs pythia 6
DO_MAT_ELEM T IESIMLEVEL 1 OESIMLEVEL 2
CPU/job 1423.29 sec c,cbar Pythia generated: 22109 Scaled c,cbar Pythia: 193091.7 ? 10? Topher warp ~230 files per mc run ?90 cpu hours gmode/ mc run = 180 K (~45% of gmode in our data sample of 3051 runs in mcs6)
To generate one ccbar full data set would require ~3 alpha (500MHz) months!