Gabriele Cosmo
67 lines
2.2 KiB
Plaintext
67 lines
2.2 KiB
Plaintext
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RE01 - An extended example for run and event
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Contact : M.Asai (SLAC)
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1. Introduction
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This example demonstrates how to connect the information between
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primary particles and hits. It also utilize some user-information
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classes.
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1.1 Geometry and region information
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It has a quite simple cylindrical tracker of 5 layers and a
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cylindrical calorimeter of lead and scintillator. Dedicated regions
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are assigned to both tracker and calorimeter mother volumes not
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for setting additional production thresholds but for adding some
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more information to these regions. RE01RegionInformation is the
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class for this purpose.
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A "readout geometry" is attached to the calorimeter to define
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its cells.
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1.2 Physics
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This example basically uses QGSP_BERT physics list. In addition
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to this, RE01UnknownDecayPhysics is used for adding decay process to
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G4UnknownParticle.
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1.3 Event generator
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An event sample is attached. This event has a Higgs particle
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which decays into e+e- and mu+mu- pairs through two Z bosons.
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It uses G4HEPEvtInterface.
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In this example, by utilizing G4UnknownParticle, all particles
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appear in the primary event are converted to G4Track and then
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to RE01Trajectory. Relation between primary particles and track
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IDs are shown at the end of event execution.
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2. "Source track" information
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"Source track" is meant for a track that is either a primary
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particle or a track born is the tracking region. This information
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is stored in RE01TrackInformation class object and copied from
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a parent track to its daughters.
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2.1 Track suspension
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All source tracks are suspended for their tracking when they are
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getting into the calorimeter region. Thus, all tracks in the tracker
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region are tracked before generating any shower in the calorimeter.
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2.2 Tracker hits associated with primary particle information
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Information kept in RE01TrackInformation is used to connect each
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tracker hit to the primary particle.
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2.3 Energy deposition of each source track
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Utilizing RE01StackingAction, shower generation is done for each
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souorce track separately, and thus energy deposition in calorimeter
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cells are shown for each individual source track. With the trajectory
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information, energy deposition for each primary particle can also
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be gotten.
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