| Geant4 Cross Reference |
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2
3 Example of the external decayer implementatio
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5
6 The complete PYTHIA6 documentation can be fou
7 http://home.thep.lu.se/~torbjorn/pythiaaux/re
8
9 The PYTHIA6 external decayer was originally d
10 the AliRoot framework, by Andreas Morsch (CER
11 The dependence on the ALICE software was take
12 by Christian Holm Christensen,
13 The dependence on the Root framework and the
14 the Geant4 framework was done by Ivana Hrivna
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17
18 The use of the external decayer is demonstrat
19 classes from common examples repository, see
20
21 The G4Pythia6Decayer class provides the imple
22 G4VExternalDecayer interface with using PYTHI
23 to be able to use PYTHIA6, which is written i
24 a C++ interface class Pythia6 is provided. Th
25 interfaces only the PYTHIA6 functions relevan
26
27 The G4Pythia6Decayer is instantiated in the P
28 in the ConstructProcess() function where the
29 to G4Decay process for all particles.
30 To demonstrate the decay with external decaye
31 the B- meson is defined in ExG4PrimaryGenerat
32 as it has no own decay table defined within G
33
34 With PYTHIA6, it is possible to force a selec
35 type. This selection can be chosen interactiv
36 the implemented Geant4 UI command:
37
38 /pythia6Decayer/forceDecayType decayType
39
40 where the available decay types are listed i
41 enumaration.
42
43 The classes Pythia6, G4Pythia6Decayer, G4Pyth
44 are independent from the example classes and
45 in another user application.
46
47 Installation:
48
49 1. Download the PYTHIA6 source file from the
50 http://www.hepforge.org/downloads/pythia6
51
52 2A.) With CMake: Build pythia6 library
53
54 For a convenience a CMake file for buildin
55 the source is provided in
56 examples/extended/eventgenerator/CMakeList
57 Build the pythia6 library following the in
58 and then define the environment variables:
59 PYTHIA6 the path where pythia6 li
60 PYTHIA6_VERSION the pythia version
61
62 2B.) With GNUmake: Define the environment var
63 PYTHIA6 the path to pythia-versi
64 PYTHIA6_VERSION the pythia version
65
66 e.g. If you download pythia-6.4.26.f.gz an
67 then you have to set:
68 export PYTHIA6=$HOME
69 export PYTHIA6_VERSION="6.4.26"
70
71 Pythia6 will be then compiled together wit
72
73 3. Compilation:
74 Then the example is compiled in a standard
75 Note that with GNUmake build, an additiona
76 needed before 'gmake'.
77
78 Execution:
79
80 % pythia6_decayer pythia6_decayer.in
81
82 This example uses the following user action cl
83 repository available in common subdirectory:
84 DetectorConstruction
85 GunPrimaryGeneratorAction