ATC: ATLAS Center at ANL

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[[snowmass2013:montecarlo| <<back]]

======  How to access leptons ======

The example of how to access leptons is given in examples/Example1.C (for electrons) inside  Delphes3
installation directory.
======  How to access missing ET ======

The example of how to access missing ET  is given in examples/Example2.C
of the Delphes installation directory.

======  How to access jets  ======

This is more complicated due to the presence of pileup and fake jets. 
In an idealized scenario, we will need identify "signal" jets reconstructed from  non-pileup
particles and apply an offset correction to compensate for extra energy from pileup.
Here is simple method:

  - Build truth jets using Fastjets and non-pileup particles (status=1)
  - Match reconstructed jets with truth jets using a cone 0.15-0.2 in Eta and Phi. Such matched jets will be used for further analysis. The matching is a simplified  method to select signal jets (the jet vertex fraction used in ATLAS is not implemented in Delphes) 
  - Apply  a simple  offset correction to correct jets back to the "non-pileup" scenario.

See the correction procedure [[snowmass2013:howto_d3_jets|here]]