Three Types of MCs
SlowMC - GEANT based simulation
- detector design/offline software development
- accurate but slow
you have to go through entire lives of all generated secondary particles
FastMC - Parametrized shower/interaction
- detector design/offline software development
CDF and D0 upgrade design has been done partially w/ MCfast
http://fnpspa.fnal.gov/mcfast.html
QuickMC - Parametrized performance of detector (s,e, etc.)
- direct connection of 4-vector of input particle and analysis results
- as quick as event generator
should be revised when detector design/analysis software changed