Global Strategy

• The Common Alpgen+Pythia MC production will start from a conservative setting. Variations around this setting will be made to try to fit the data best. To this aim: 
• 2 factorization scales will be used, 
• variations around their central values will be made using the global Qfact
• using all the defaults, different PDFs will be tried
• using all the defaults, the pT(j) cuts will be modified
• using all the defaults, the dR(j,j) cuts will be changed
  
• The optimal Alpgen setting will be derived from these systematic comparisons between data and W(+jets)->enu/munu and Z(+jets)->ee/mumu Alpgen+Pythia samples. For these samples, mainly gluon or light flavor quark jets will be considered (final states w/ 1 or 2 c from the ME will be rejected in order to avoid double counting wrt to W+c+jets and W+ccbar+jets processes). Nevertheless we'll also produce samples of V+Q+jets and V+QQ+jets in order not to delay analyses using b-tagging
• This optimal setting will then be utilized for all the Alpgen+Pythia processes (V+jets w/ tau decays, V+Q+jets, V+QQ+jets, photon+jets, QQ+jets, H+jets, VV+jets,...) while waiting for further specific studies
• We'll study MC samples of V+(0-4)jets
  

Last update:  SM  28 Apr 04