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Cleanup electronSuperCluster Builder

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:bremSearch_tune into master

Cleaning up a bit the code in electronSuperCluster Builder

  • Simplify a bit the selection logic code, same functionality but a bit cleaner.
  • Remove a few counters for which I was not even sure, if/how we use them, or would work in MT
  • Use the default threshold in the configuration (1.5 GeV, as we seed the GSF at 1.5 - 2 GeV should be ok)
  • Use the egamma EMFraction variable if available (includes pre-sampler).
  • The so called brem search does the checks at the 2nd layer of the calorimeter as this is where the extrapolation occured.
  • And it has more of a photon like window for the search (since this is supposed to be brem like photons we look for here)

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