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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 Example RE05
8 ------------
9
10 Example RE05 has a simplified collider detector geometry. This example
11 demonstrates the following features.
12 It was moved in extended examples from novice/N04 with removal of
13 novice examples.
14
15 1. PYTHIA primary events.
16
17 RE05PrimaryGeneratorAction has G4HEPEvtInterface as the generator.
18 G4HEPEvtInterface accesses to "pythia_event.data", which contains three
19 events of Higgs generation produced by PYTHIA. "pythia_main.f" is an
20 example FORTRAN code of PYTHIA for generating this event sample.
21
22 2. Readout geometry
23
24 RE05DetectorConstruction defines a simplified collider detecor
25 geometry, tracker made of cylindrical tubes, calorimeter made of
26 cylindrical tubes, and muon trackers made of planes.
27
28 The cylindrical calorimeter is made of tubes of lead and a scintillator.
29 Energy deposition in the scintillator is accumulated by RE05CalorimeterSD
30 sensitive detector, which is assigned to a dedicated parallel world,
31 RE05CalorimeterParallelWorld, which defines the phi-z cell.
32
33 3. Physics processes
34
35 The example uses the QBBC physics list, which includes electromagnetic
36 and hadronic interactions.
37
38 4. Event filtering by the stacking mechanism.
39
40 Higgs events in "pythia_event.data" have two lepton pairs produced
41 by the Higgs decay via Z0. At the first stage of each event, only the
42 primary muons are tracked without tracking secondaries. then the number
43 of hits on the muon trackers are examined. At the next stage, only
44 the primary charged particles are tracked only inside the barrel
45 tracking area and the isolation of the primary muons are examined.
46 At the third stage, all particles in the RoI (Region of Interest) along
47 the isolated muons are tracked. All these examinations are applied in
48 RE05StackingAction.
49
50 5. Input macro files
51
52 5.1 exampleRE05.in
53
54 Read "pythia_event.data" and run 10 events. This macro file
55 demonstrates the feature described in the previous section.
56
57 N.B. For release 11.3, this macro is temporarily altered to shoot
58 muons by particle gun. Once HepMC3 interface becomes ready, this
59 example will be overhauled and this macro file will be updated
60 accordingly.
61
62 5.2 exampleRE05.EMtest.in and exampleRE05.EMtest.large_N.in
63
64 Alternative macros with shooting muons for checking EM physics.
65
66 6. How to start
67
68 - Execute RE05 in 'batch' mode from macro files
69 % exampleRE05 exampleRE05.in
70
71 - Execute RE05 in 'interactive mode' with visualization
72 % exampleRE05
73 ....
74 Idle> type your commands. For instance:
75 Idle> /run/beamOn 3
76 ....
77 Idle> exit
