2. Generation and Fast Simulation

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Valentin Volkl, Juraj Smiesko, Clement Helsens, Gerardo Ganis, Xunwu Zuo

If you want to get started with generation and analysis of fast-simulated events, you’re at the right place.

If you want to get started with generation and a first quick inspection of fast-simulated events, you’re at the right place. This chapter focuses on the generation of samples. A more in-depth look at FCCAnalyse is given in the next chapter.

Fast simulation is currently supported through the Delphes approach. Support for the Papas approach, initially used for FCC-ee, is discontinued.

If you have any problems or questions, you can open an issue on the GitHub repository where these lessons are developed.

Contents:

• 2.1. Getting Started with Event Generation
  • 2.1.1. Enabling FCC Software
  • 2.1.2. Generators
    • 2.1.2.1. Overview
    • 2.1.2.2. Pythia8
    • 2.1.2.3. Whizard
    • 2.1.2.4. KKMCee
    • 2.1.2.5. BHLUMI
    • 2.1.2.6. BabaYaga
    • 2.1.2.7. Herwig
    • 2.1.2.8. MadGraph5
  • 2.1.3. Hands-on case study: ditau events with Pythia8, Whizard and KKMCee
    • 2.1.3.1. Generating ditaus with Pythia8
    • 2.1.3.2. Generating ditaus with Whizard
      • 2.1.3.2.1. LHEf to EDM4hep conversion
    • 2.1.3.3. Generating ditaus with KKMCee
      • 2.1.3.3.1. Generating HepMC events
      • 2.1.3.3.2. HepMC to EDM4hep conversion
        • 2.1.3.3.2.1. Dissection of hepmc2edm.py
        • 2.1.3.3.2.2. Running hepmc2edm.py
    • 2.1.3.4. Looking at the produced files. Comparing distributions
      • 2.1.3.4.1. Looking the MCParticle class
      • 2.1.3.4.2. Building FCCAnalyses
      • 2.1.3.4.3. Creating histograms with FCCAnalyses
        • 2.1.3.4.3.1. Dissection of histmaker_ttmm.py
        • 2.1.3.4.3.2. Running histmaker_ttmm.py
      • 2.1.3.4.4. Comparing distributions
      • 2.1.3.4.5. Possible conclusion of the exercise
• 2.2. Getting Started with Fast Simulation in Delphes
  • 2.2.1. Generate and Simulate Events with DelphesEDM4Hep
  • 2.2.2. Sample Generation: Pythia8 + EvtGen
  • 2.2.3. Creating custom decay file
• 2.3. EDM4hep Event Data Explorer: eedE
  • 2.3.1. edm4hep2json
  • 2.3.2. Using eedE
    • 2.3.2.1. Visualizing the MC particle Tree