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Analysing pp W events using HepMCAnalysis Tool .

Analysing pp W events using HepMCAnalysis Tool . Marc Sangel Supervisor: Sebastian Johnert DESY Summer Student Programm Hamburg, DESY, 02. September 2011. Outline. Analysis Chain. HepMC Format. Graph structure of physics event HepMC f ormat: v ertex and particle structure

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Analysing pp W events using HepMCAnalysis Tool .

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  1. AnalysingppWeventsusingHepMCAnalysisTool. Marc Sangel Supervisor: Sebastian Johnert DESY Summer Student Programm Hamburg, DESY, 02. September 2011

  2. Outline

  3. Analysis Chain

  4. HepMC Format • Graph structure of physics event • HepMCformat: vertex and particle structure • Particles: kinematic information, ID, … • Each particle belongs at least to one vertex

  5. HepMCAnalysis tool

  6. Workflow of HepMCAnalysis

  7. Why is ppWinteresting?

  8. Results for different generators: W histograms (W) • Hardly differences between Pythia6 and Pythia8 • Higher differences between Herwig++ and Pythia • Herwig++ does not decrease for first bin → will be checked

  9. Results for different generators: histograms Pythia6 Herwig++ Pythia8 • No significant deviations between generators for histograms • Highest deviation: Herwig++ • -ln(tan())

  10. Results for different generators: charged stable particles number • peculiar behaviour of Pythia8 • Pythia6 and Herwig++ very similar Pythia6 Herwig++ Pythia8

  11. Parton Distribution Functions (PDFs)

  12. Results for Different PDFs: W histograms • Good agreement of PDFs different orders for • Differences between LO and other PDFs in rapidity of W as expected • LOmod distributions close to NLO distributions (W) LO NLO NNLO LOmod (LO*)

  13. Results for different PDF: histograms • Again good agreement of histograms • Behaviour as expected • LOmod gives good approximation of NLO • Similar results in arXive:0711.273v3 [hep-ph] LO NLO NNLO LOmod (LO*)

  14. Results for different PDFs: Charged particles • Again big differences for charged particle histograms number LO NLO NNLO LOmod (LO*)

  15. Efficiency calculation

  16. Results of efficiencies for different PDFs For hadronically and leptonically decaying : For hadronically decaying only: Decay ratio (had/total) ATLAS: Efficiency: 0.0975, Error: 0.0019; (arXive:1108.4101v1)

  17. Summary

  18. Class Library

  19. Generators

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