Track association to MC particle

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Track association to MC particles

UNDER CONSTRUCTION !

Definition, Track MC particles:

  • VELO part:
    If  70% of the clusters are associated to the same MC particle, then the VELO part is associated to a MC particle (id_velo).
  • TT part:
    If  all clusters except one are associated to the same MC particle, then the TT part is associated to a MC particle (id_TT).
  • T part:
    If  70% of clusters are associated to the same MC particle, then the T part is associated to a MC particle (id_T).
     
  • Long tracks:             id_velo == id_T, no check on id_TT
    Exception:                If the MC particle in T(id_T) is a daughter of the MC particle in the VELO(id_VELO), then the track is associated to both MC particles.
  • Upstream tracks:      id_T     == id_TT
  • Downstream tracks: id_velo == id_TT
  • Else,  track is defined as a ghost.

Definition, cluster MC particles:

  • Sum of associations of the hits to MC particles inside a cluster.

Definition, hit MC:

  • VELO: A MC particle is related to a MCVeloFE if it contributes > 10% of  VeloSimParams::threshold.
    The VeloSimParams::threshold value is by default 4500 electrons.
  • ST     : A MC particle is related to a digit if it contributes more than 10% to the total deposited charge.
  • OT    : Any MC particle having a MCHit in OT is associated to an OTDigit. (Can there be more than one MC particle associated to the same OTDigit ?).
  • TO BE KEPT IN MIND: Hits from spillover events have by default no link to the MC truth, therefore any track reconstructed from a spillover MC particle is a ghost.

Implementation:

TR 27/02/2006