Gabriele Cosmo
75 lines
2.5 KiB
Markdown
75 lines
2.5 KiB
Markdown
\page ExampleRE05 Example RE05
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Example RE05 has a simplified collider detector geometry. This example
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demonstrates the following features. \n
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It was moved in extended examples from novice/N04 with removal of
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novice examples.
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## PYTHIA primary events
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RE05PrimaryGeneratorAction has G4HEPEvtInterface as the generator.
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G4HEPEvtInterface accesses to "pythia_event.data", which contains three
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events of Higgs generation produced by PYTHIA. "pythia_main.f" is an
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example FORTRAN code of PYTHIA for generating this event sample.
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## Readout geometry
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RE05DetectorConstruction defines a simplified collider detecor
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geometry, a tracker made of cylindrical tubes, a calorimeter made of
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cylindrical tubes, and muon trackers made of planes.
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The cylindrical calorimeter is made of tubes of lead and a scintillator.
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Energy deposition in the scintillator is accumulated by RE05CalorimeterSD
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sensitive detector, which is assigned to a dedicated parallel world,
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RE05CalorimeterParallelWorld, which defines the phi-z cell.
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## Physics processes
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The example uses the QBBC physics list, which includes electromagnetic
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and hadronic interactions.
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## Event filtering by the stacking mechanism
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Higgs events in "pythia_event.data" have two lepton pairs produced
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by the Higgs decay via Z0. At the first stage of each event, only the
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primary muons are tracked without tracking secondaries. then the number
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of hits on the muon trackers are examined. At the next stage, only
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the primary charged particles are tracked only inside the barrel
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tracking area and the isolation of the primary muons are examined.
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At the third stage, all particles in the RoI (Region of Interest) along
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the isolated muons are tracked. All these examinations are applied in
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RE05StackingAction.
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## Input macro files
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- exampleRE05.in:
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Read "pythia_event.data" and run 10 events. This macro file
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demonstrates the feature described in the previous section.
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N.B. For release 11.3, this macro is temporarily altered to shoot
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muons by particle gun. Once HepMC3 interface becomes ready, this
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example will be overhauled and this macro file will be updated
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accordingly.
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- exampleRE05.EMtest.in and exampleRE05.EMtest.large_N.in
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Alternative macros with shooting muons for checking EM physics.
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## How to start
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- Execute RE05 in 'batch' mode from macro files
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```
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% ./exampleRE05 exampleRE05.in
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```
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- Execute RE05 in 'interactive mode' with visualization
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```
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% ./exampleRE05
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....
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Idle> type your commands. For instance:
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Idle> /run/beamOn 3
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....
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Idle> exit
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```
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