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Add a new PMGDecayProductsSelectionTool to PMGTools

Tadej Novak requested to merge tadej/athena:analysis/truth1 into 21.2

Maybe I'm mistaken but there has never been a nice way to dump TRUTH0/TRUTH3 to flat ntuples. I started porting my code to the CP algorithms and this is the first step which can also be used in standard jobs. Although this MR for now only contains one tool I plan to add more:

  • a tool to select by PDG ID
  • an algorithm to decorate parent and child information

The PMGDecayProductsSelectionTool selects particles if they satisfy the following requirements:

  • they originate from one of the required initial particles
  • they only decay through an allowed list of particles (optional)

/cc @lcorpe

Edited by Tadej Novak

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