Difference: CMSDAS2018_GEN_Draft (3 vs. 4)

Revision 42018-08-23 - AndreasAlbert

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Part 1: Using MadGraph to generate parton-level events

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TASK 3: Parton showering

To generate physical collision events, the LHE files we have created need to be showered. Parton showering accounts for non-perturbative QCD effects with phenomenological models.

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The most used tool for parton showering in CMS is Pythia 8 (P8). While we could again run P8 completely on our own (you can download it from the P8 website, compile and run it on your laptop if you'd like), we are going to use the CMSSW GeneratorInterface in this exercise. Simply stated, CMSSW can act as a wrapper around various generators and chain their outputs together. This makes it quite easy to run large-scale production from a gridpack to the finished (Mini/Nano)AOD file.
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The most used tool for parton showering in CMS is Pythia 8 (P8). While we could again run P8 completely on our own (you can download it from the P8 website INSERTLINKHERE, compile and run it on your laptop if you'd like), we are going to use the CMSSW GeneratorInterface in this exercise. Simply stated, CMSSW can act as a wrapper around various generators and chain their outputs together. This makes it quite easy to run large-scale production from a gridpack to the finished (Mini/Nano)AOD file.
 

Use cmsDriver to shower an existing LHE file

 
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