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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 HepMCEx01
8 ---------
9
10 HepMCEx01 is based on ExampleN04, which has a simplified collider detector
11 geometry. Only part of the primary generator action is replaced with new one.
12 This example demonstrates the following features.
13
14 1. HepMC interface
15
16 ExN04PrimaryGeneratorAction has HepMCG4Interface as the generator.
17 There are two types of generators provided as samples. One generator reads
18 primary information from a HepMC Ascii file (data/example_MyPythia.dat).
19 The other one generates primaries directly invoking PYTHIA routines
20 in every event.
21
22 2. Readout geometry
23
24 ExN04DetectorConstruction 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 Cylindrical calorimeter is made of tubes of lead and scintirator
28 without cut in phi nor z direction. Energy deposition in scintirator
29 is accumulated by ExN04CalorimeterSD sensitive detector, which has
30 a readout geometry to find the phi-z cell.
31
32 3. Full set of "ordinary" physics processes
33
34 FTFP_BERT physics list defines almost all of leptons and hadrons which
35 Geant4 has dedicated classes for. Also almost all physics processes
36 Geant4 has are defined.
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 ExN04StackingAction.
49
50 5. Installation
51
52 See HepMC/README how to build this example.
53
54 6. Execution
55
56 % HepMCEx01 hepmc_pygen.in
57
