Distributions of quantities to compare to data in order to constrain systematic uncertainties

The purpose of this page is to collect a list of useful distributions to compare data and Monte-Carlo in order to constrain radiation degrees of freedom and/or other systematics. The jet veto analysis in the dilepton channel is a very good example of this. For systematic experiment independent MC-generator comparisons the measurements should be unfolded and implemented as Rivet routines.

Jet multiplicity (related) distributions

Jet veto

  • First jet These analyses are ready from both, ATLAS and CMS. It allowed ATLAS to modify the Pythia parameters (ISR/FSR) to cover a smaller uncertainty than the previous settings. ATLAS Rivet routine link.
  • sum(pT) of jets in a phase space region (ditto)
  • Second jet We propose to also look at the second jet in the dilepton channel (excluding the two jets from ttbar).

Direct multiplicity measurement in different phase space regions

phase space regions = jet pt- (and eta-) cuts

  • Unfolded spectrum of njets in lepton+jets channel
  • Unfolded spectrum of njets in dilepton channel

Differential distributions

Jet shapes

  • track and calo, for each of b-tagged and light jets
  • Example: jet mass, jet energy in jet cones of different radius (omega and rho parameters)

External links

* Link to November 8th presentation


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Topic revision: r4 - 2015-10-08 - MartijnMulders
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