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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

AnalysingppWeventsusingHepMCAnalysisTool.

Marc Sangel

Supervisor: Sebastian Johnert

DESY Summer Student Programm

Hamburg, DESY, 02. September 2011




Hepmc format
HepMC Format

  • Graph structure of physics event

  • HepMCformat: vertex and particle structure

  • Particles: kinematic information, ID, …

  • Each particle belongs at least to one vertex



Workflow of hepmcanalysis
Workflow of HepMCAnalysis


Why is pp w interesting
Why is ppWinteresting?


Results for different g enerators w histograms
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


Results for different generators histograms
Results for different generators: histograms

Pythia6

Herwig++

Pythia8

  • No significant deviations between generators for histograms

  • Highest deviation: Herwig++

  • -ln(tan())


Results for different generators charged stable particles
Results for different generators: charged stable particles

number

  • peculiar behaviour of Pythia8

  • Pythia6 and Herwig++ very similar

Pythia6

Herwig++

Pythia8



Results for different pdfs w histograms
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*)


Results for different pdf histograms
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*)


Results for different pdfs charged particles
Results for different PDFs: Charged particles

  • Again big differences for charged particle histograms

number

LO

NLO

NNLO

LOmod (LO*)



Results of efficiencies for different pdfs
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)





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