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Twiki:

ATLAS Physics

-Top Working Group
-TopCrossSectionTauJetsChannel
-TopCommonScales
-TopCommonObjects
-TopSystematicUncertainties
-TopRootCoreRelease
-TopD3PDProductions

- D3PDContent
-TopInputsD3PDMaker  
- TopTauObjects

- TauRecommendationsWinterConf2013
 
- DataPreparationCheckListForPhysicsAnalysis
-GRL Twiki
-GRL SVN
- Tau Working Group
 -Susy2012

- HSG6Analysis2012

-TopETmissFall2012

- METUtilityAthena

SVN Repository:
- Ahmed Hasib
- Catrin Bernius

Monte Carlo & Data Samples:

- MC signal and background samples for analysis. 
- TopMC2012   (Signal samples: ttbar Baseline and Systematic Samples)
- TopData2012     : For recommendations look at Top Reconstruction Group and Top GRL
- ATLAS Monte Carlo Working Group

• The x-section and filt. efficiency (FE) values from AMI should be used for reference. In the sample lists the product of the FE*x-section is passed. The exception are the cases when sample x-section is not filled to AMI correctly and has not been manually corrected. In this case a note is passed in the sample lists below. See here for AMI command line querry tips.

• The following content is automatically filled in the twiki tables:
  • Brief : brief string describing the sample (automatically extracted)
  • Channel : decay channel: (automatically extracted)
    • ttbar options:
      • AllHadronic: both t and tbar decay to hadrons
      • DiLepton : both t and tbar decay to leptons, lepton = e,mu,tau
      • NoAllHadronic : at least one of t and tbar doesn't decay to hadrons (directly)
  • MC Generator : generator string (automatically extracted). "Pythia" or "fPythia" refer to Pythia6 unless "Pythia8" is explicitly stated. Similar for "Herwig" or "fHerwig" vs "HerwigPP" or "Herwig++".
  • DSID : dataset ID. Click on it to view the sample jO file.
  • Nominal Size : the requested number of reconstructed events (= size of AOD). If the entry is 0 the AOD exists but no events are available. If the entry is blank then the AOD does not exist. (automatically extracted)
  • FE x-sec [pb]* : filtering efficiency (branching ratio) times the cross-section (automatically obtained from AMI unless specified otherwise)
  • K-factor : K-factor obtained from the reference x-section and the FE* x-sec [pb] field (automatically extracted)
  • Reference x-sec: link to reference x-section article or twiki (set as table input)
  • Production link: link to the sample-related tasks data in the production system database (automatically extracted)
  • AMI EVGEN: link to evgen (most informative for MC aspects...)-level AMI info (automatically extracted)
  • AMI AOD: link to AOD (automatically extracted)
  • AMI NTUP_TOP: link to the Top D3PD (automatically extracted)
  • Comm: comment field (set as table input)

  Sample Notes

  Generator used for the largest fraction of the samples is MC@NLO+Herwig/Jimmy. Note that MC@NLO samples have event weight. Each event has a weight of +1 or -1. Only the sum of the weights is a physical quantity. If you are calculating the integrated luminosity for the sample, your numerator should be the sum of the weight. While the default generator to be used for the analysis is MC@NLO+Herwig/Jimmy the ttbar samples are also generated with a variety of other MC generators.

 
• Pythia and Herwig: Both of these general purpose generators contain a large number of built-in processes which are generated at the lowest QCD order, therefore they are at
fixed leading-order. However, they provide reduced accuracy in multi-parton final states as they handle QCD and QED radiations only at the parton shower evolution (see next paragraphs). Therefore, they are not the primary choice for the generation of events. In the analysis presented here Herwig is used only for the generation of di-boson events.

• AlpGen: The AlpGen generator is a leading-order matrix element generator specialized for multi-parton final states (2 → N). In contrast to Pythia and Herwig, it provides a more accurate description by using perturbation theory on all the relevant tree-level Feynman diagrams with a fixed number of outgoing partons. The result is bare partons and therefore an additional simulation package must be interfaced to handle subsequent processes. This generator is used to simulate the backgroundW+jets, Z+jets and QCD multi-jet processes up to five outgoing partons.

• Sherpa: Similar to AlpGen it provides a more accurate description of multi-parton final states based on matrix element calculation. However, it can also handle internally
the rest of the processes without needing to couple with an external package. In this thesis, W+jets events generated with this generator are used for systematic studies.

• AcerMC: Also a leading-order generator, the AcerMC provides a library of matrix-element calculation of a number of built-in processes. Primarily aimed for background processes
with a large number of partons in the final state, such as W+jets and Z+jets, it can also be used for the simulation of t¯t events. Simulated ttbar events using AcerMC are used for the systematic studies of ISR/FSR effects

• MC@NLO and POWHEG: The only generators in this thesis that provide both real and virtual corrections in the generation process at next-to-leading order. Primarily used
for the production of top quark events. The MCatNLO is used to generate the signal events for the ttbar cross-section analysis, while POWHEG is used for systematic studies.
MC@NLO is also used for generation of the single-top events.



Presentation Slides:
- Analysis Code, SVN and Trigger: July 13, 2012
- Status of TauPlusJets2012 Code: July 27, 2012
- Status of TauPlusJets2012 Code: Aug 03, 2012

Papers:

Measurement of the ttbar production cross section in the final state with a hadronically decaying tau lepton and jets
 using the ATLAS detector: ATLAS-CONF-2012-032 March 12, 2012

Measurement of the ttbar production cross section in the tau + jets channel using the ATLAS detector

Important Indico Pages:

Object Selection

Notes

• For TOP2012 we may keep 2011 isolation cuts, while a full re-optimization of the 2012 isolation cuts (also considering mini-isolation as candidate) is being pursued

RootCorePackages2012

egammaAnalysisUtils-00-03-61 I'm using the tag version 00-03-79 currently.