Example RE05 has a simplified collider detector geometry. This example demonstrates the following features.
It was moved in extended examples from novice/N04 with removal of novice examples.

PYTHIA primary events

RE05PrimaryGeneratorAction has G4HEPEvtInterface as the generator. G4HEPEvtInterface accesses to "pythia_event.data", which contains three events of Higgs generation produced by PYTHIA. "pythia_main.f" is an example FORTRAN code of PYTHIA for generating this event sample.

Readout geometry

RE05DetectorConstruction defines a simplified collider detecor geometry, a tracker made of cylindrical tubes, a calorimeter made of cylindrical tubes, and muon trackers made of planes.

The cylindrical calorimeter is made of tubes of lead and a scintillator. Energy deposition in the scintillator is accumulated by RE05CalorimeterSD sensitive detector, which is assigned to a dedicated parallel world, RE05CalorimeterParallelWorld, which defines the phi-z cell.

Physics processes

The example uses the QBBC physics list, which includes electromagnetic and hadronic interactions.

Event filtering by the stacking mechanism

Higgs events in "pythia_event.data" have two lepton pairs produced by the Higgs decay via Z0. At the first stage of each event, only the primary muons are tracked without tracking secondaries. then the number of hits on the muon trackers are examined. At the next stage, only the primary charged particles are tracked only inside the barrel tracking area and the isolation of the primary muons are examined. At the third stage, all particles in the RoI (Region of Interest) along the isolated muons are tracked. All these examinations are applied in RE05StackingAction.

How to start

Execute RE05 in 'batch' mode from macro files
```
% exampleRE05   exampleRE05.in
```

Execute RE05 in 'interactive mode' with visualization

% exampleRE05
....
Idle> type your commands. For instance:
Idle> /run/beamOn 3
....
Idle> exit