Observables
From Wiki Les Houches 09
Identifying/analyzing observables, ratios of observables, systematic uncertainties (renorm.scale, PDFs), obtaining cross sections from public codes/ntuples. The observables might involve both jets and leptons. Identify for which process/observable NLO calculations are available. What is suitable for start-up (eg. normalization issues, Drell-Yan, top, ...)
People signed up for this group:
- Bruce
- Rohini
- Kajari
- Gudrun
- Vitaliano
- Tanju
- Peter
- Frank-Peter
- Laura
- Giacinto
- Jon
- Matthew
- Matteo
- Nikolas
- Alessandro
- Joanna
- Lorenzo
- Jeppe
- Paolo
- Radja
- Reinhard
Contributions from several discussions so far
- Normalization of tT cross section, using Z and/or Z*, or Z at high pT (in order to enhance gluon contribution and thus reduce anti-correlation
with the gg-PDF needed for the tT production)
- cf. the discussion about Higgs systematics
- Rohini, Bruce, Michael Dittmar, Guenther, Joey, Nikolas
- Same as above, but normalization of Di-boson production
- Bruce, Nikolas
- Action item for these normalization studies: get numbers on exp. and theo. uncertainties for the Z (large pt) counting for a given int. lumi.
- detailed study of di-lepton (DY) Production, all relevant systematics
- Samir, Kajari
- discussions on ratios of cross sections in W/Z+jet production
- example : sigma(W+>=3jets)/sigma(W+>=2jets), look at 3rd jet production as function of rap diff. of leading 2 jets
- Z+jet : analysis of hadronic part of event, such as event shapes
- Jeppe,Vitaliano, Piergiulio, Alessandro,Joey
- discussion of relevant observables in QCD incl. jet production
- incl. cross section, ratio of di-jet production in diff. rap. bins
- clear wish (high priority): obtain NLO+shower code for di-jet production
- Paolo
- discussion on observables involving photons
- W+gamma (comparison of available calc.), gamma-gamma final states
- important issue: definition of isolation
- Kajari, Susan,Joey
- establishment of Root Ntuples for easy use by experimentalists, containing all necessary info from LO/NLO codes output, see subpage ROOT ntuples
- Joey, Joanna,Frank-Peter
- comparison of NLO predictions (e.g. W + 3 jets) for different observables/scales in order to understand the uncertainties of scale choices/cross section results; using knowledge of existing NLO calculations to understand motivated scale choices at LO for uncalculated (to NLO) cross sections
- Joey, Nikolas, Giulia, Tanju...