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Highlights of the SiD -Iowa Particle Flow Algorithm. Previous (LOI) version of PFA was for up to 500 GeV collider energy. Even at 500 GeV performance sufficient, but could be improved. Established a ground-up approach:

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highlights of the sid iowa particle flow algorithm
Highlights of the SiD-Iowa Particle Flow Algorithm
  • Previous (LOI) version of PFA was for up to 500 GeV collider energy.
    • Even at 500 GeV performance sufficient, but could be improved.
  • Established a ground-up approach:
    • Targeted diagnostics for each piece of the algorithm to evaluate each piece.
  • Photon reconstruction:
    • Once photons are reconstructed, the hits are taken out from use.
    • An anti veto is in place which checks “photon-hits” for fakes and treats them as hadrons.
  • Sub-cluster categories (clump purity)
    • Clump (sub-cluster) purity was not good enough: make smaller (don’t use NN).
  • Linking probabilities of sub-clusters (discriminating variables, likelihood)
    • Use identical clustering for linking probability and shower reconstruction.
    • Add likelihood method with several discriminating variables.
  • Shower reconstruction (two passes):  IN PROGRESS
    • Form a high purity skeleton with all tracks treated similarly.
    • Add hits in second pass with adjudication between nearby showers.
highlights of the sid iowa particle flow algorithm1
Highlights of the SiD-Iowa Particle Flow Algorithm

Clump reconstruction

performance

Variables in likelihood

used for linking

Discrimination improves significantly when angles b and c are added in the likelihood

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