Event Generation Offline Guide


A variety of event generators are currently used in CMS. They range from general-purpose ones (Pythia8, Herwig++, Sherpa) to more specific ones (Matrix Element calculators like Alpgen, MadGraph5_aMCatNLO, generators for diffractive physics, cosmic muon generators, and so on).
The objective of general-purpose event generators is to provide as accurate as possible a description of what happens in a particle collision. They contain theory and models for a number of physics aspects, such as hard and soft interactions, parton distributions, initial and final state parton showers, multiple interactions, fragmentation and decay. They are also used for hadronization of the parton-level events modeled with one or another ME generator.

In CMSSW, generators are incorporated as external, well-encapsulated packages, while CMS-specific software provides an interface to one or another packge and allows to tune it to generate events of a desired topology, via a set of generator-oriented configuration cards.
As many uncertainties are involved here, we do not speak of the "algorithms" but rather refer to activities in the area of fine-tuning and validating various MC tools, via links to relevant documents.
Neither is it possible to provide a uniform recipe for modifying parameters/settings.

  • The main generator page is here
  • A tutorial on how to generate events in 30 minutes is here
  • A more detailed tutorial on how to generate events is here

Responsible: Roberto Covarelli
Last reviewed by: RobertoCovarelli - 2015-02-27

Topic attachments
I Attachment History Action Size Date Who Comment
Texttxt Pythia_6227_decay_table.txt r1 manage 548.4 K 2007-03-13 - 15:55 PaoloBartalini Pythia 6.227 decay table (result of the call to PYLIST(12))
Texttxt Pythia_6409_decay_table.txt r1 manage 549.4 K 2007-08-24 - 12:22 PaoloBartalini  
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Topic revision: r27 - 2015-03-04 - RobertoCovarelli

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