Difference: TheorySystematics (10 vs. 11)

Revision 112014-05-21 - LizaMijovic

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Theory systematics


Signal (ttbar and single top) TH systematics

  • Generator modeling: comparison of central predictions from generators. Other sources not ending in one of the following categories and specific to a certain analysis may end up here (example: DR vs DS scheme for ttbar subtraction in Wt). General guidelines suggest to use for the ttbar signal at least one multileg generator and at least one NLO generator, and for single top at least two different models (one of which NLO). Differences coming from the use of different (tuned) PS models can also end up in this category whenever it is clear this is not already covered by the explicit systematic error on the description of radiation (and hadronisation).
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  • The full generator cards and PS setups, as well as the generator versions used for the systematics should be public, such that the samples are in principle reproducible for a person not internal to an individual experiment. The TOPLHCWG twikis are likely the right places where to put this information: ATLASCMSGeneratorCards .
  • ATLAS and CMS will aim to provide Rivet implementations for their analyses, when they are likely to be useful for constraining the theory systematics.


MC-MC and data-MC comparison plots

Collection of plots showing the variations currently used in ATLAS and CMS for the modelling systematics evaluation and how they compare to the available data.

Papers and notes with ATLAS and CMS theory modelling info

Please have a look at ATLAS top public results and CMS top public results pages for more and guaranteed to be up-to-date information.

Descriptions and comparisons of generator setups used by ATLAS and CMS:

  • ATL-PHYS-PUB-2014-005:Comparison of Monte Carlo generator predictions for gap fraction and jet multiplicity observables in top-antitop events
  • ATL-PHYS-PUB-2013-005: Monte Carlo generator comparisons to ATLAS measurements constraining QCD radiation in top anti-top final states
  • CMS-CR-2013-417: Signal modeling uncertainties in top quark production

 -- RobertoChierici - 05-Apr-2012 \ No newline at end of file
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