CalcHEP and Pythia

Asked by Hoda Elgendy

I need to know why do we use Calchep with Pythia? What is the difference between MadGraph and Calchep?

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Launchpad Janitor (janitor) said :
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This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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Alexander Belyaev (alexander.belyaev) said :
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Dear Hoda,
looks like your question was never answered.
Apoloies for this.
We need PYTHIA to perform beyond parton level evaluations/simulations.
Madgraph is based on helicity amplitude method, while CalcHEP is using matrix element squared one.
CalcHEP also has nice raphical interface.
All details can be found in CalcHEP manual and in my lectures:
https://www.dropbox.com/s/xihesw5mx8g6pzu/tools_nextphd_belyaev.pdf?dl=0
Please let us know if you have further questions

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