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| 2 | RE01 - An extended example for run and event
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| 3 | --------------------------------------------
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| 4 |
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| 5 | Contact : M.Asai (SLAC)
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| 6 |
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| 7 | 1. Introduction
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| 8 |
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| 9 | This example demonstrates how to connect the information between
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| 10 | primary particles and hits. It also utilize some user-information
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| 11 | classes.
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| 12 |
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| 13 | 1.1 Geometry and region information
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| 14 |
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| 15 | It has a quite simple sylindrical tracker of 5 layers and a
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| 16 | sylindrical calorimeter of lead and scintillator. Dedicated regions
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| 17 | are assigned to both tracker and calorimeter mother volumes not
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| 18 | for setting additional production thresholds but for adding some
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| 19 | more information to these regions. RE01RegionInformation is the
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| 20 | class for this purpose.
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| 21 | A "readout geometry" is attached to the calorimeter to define
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| 22 | its cells.
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| 23 |
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| 24 | 1.2 Physics
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| 25 |
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| 26 | This example basically uses LHEP_BERT physics list. In addition
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| 27 | to this, RE01DecayPhysics is used for adding G4UnknownParticle and
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| 28 | G4UnknownDecay process.
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| 29 |
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| 30 | 1.3 Event generator
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| 31 |
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| 32 | An event sample is attached. This event has a Higgs particle
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| 33 | which decays into e+e- and mu+mu- pairs through two Z bosons.
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| 34 | It uses G4HEPEvtInterface.
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| 35 | In this example, by utilizing G4UnknownParticle, all particles
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| 36 | appear in the primary event are converted to G4Track and then
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| 37 | to RE01Trajectory. Relation between primary particles and track
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| 38 | IDs are shown at the end of event execution.
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| 39 |
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| 40 | 2. "Source track" information
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| 41 |
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| 42 | "Source track" is meant for a track that is either a primary
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| 43 | particle or a track born is the tracking region. This information
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| 44 | is stored in RE01TrackInformation class object and copied from
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| 45 | a parent track to its daughters.
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| 46 |
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| 47 | 2.1 Track suspension
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| 48 |
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| 49 | All source tracks are suspended for their tracking when they are
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| 50 | getting into the calorimeter region. Thus, all tracks in the tracker
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| 51 | region are tracked before generating any shower in the calorimeter.
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| 52 |
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| 53 | 2.2 Tracker hits associated with primary particle information
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| 54 |
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| 55 | Information kept in RE01TrackInformation is used to connect each
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| 56 | tracker hit to the primary particle.
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| 57 |
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| 58 | 2.3 Energy deposition of each source track
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| 59 |
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| 60 | Utilizing RE01StackingAction, shower generation is done for each
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| 61 | souorce track separately, and thus energy deposition in calorimeter
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| 62 | cells are shown for each individual source track. With the trajectory
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| 63 | information, energy deposition for each primary particle can also
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| 64 | be gotten.
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| 65 |
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| 66 |
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