Frequently Asked Questions

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• How do I start?
  
• Can I really generate any process I want?
  
• What are the dependences of the MadGraph5_aMC@NLO code (and how to get them on lxplus (CERN))?
  
• How do I set the renormalization and factorization scales?
  
• How do I apply generation cuts?
  
• How do I shower the parton-level events?
  
• How do I get the scale dependence and PDF uncertainty without regenerating the events?
  
• How can I evaluate loops only for specific phase-space points using MadLoop?
  
• How can I run MadGraph5_aMC@NLO with a script?
  

Current limitations and common mistakes

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• Processes that need generation cuts
• Loops: what is possible and what is not
• Decay chains
• Inclusion of the width: schemes
• Appearance of resonances in real corrections
• Lepton-hadron collisions
• Inclusive samples and merging different parton/jet multiplicities (FxFx merging)
• Special settings for the parton shower

Sample of processes

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For a non-exhaustive list of processes, see the MadGraph5_aMC@NLO paper arXiv:1405.0301.