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0003 =========================================================
0004 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
0005 =========================================================
0006
0007 dmparticle
0008 ----------
0009
0010 V. Grichine (25.03.2017)
0011
0012 Geant4 application for testing of dark matter particles and processes
0013 (based on TestEm8 and monopole examples)
0014
0015 This is very preliminary and simplified Geant4 example for light dark matter (LDM) particles.
0016 It consists of LDM bremsstrahlung process (in G4LDMPhysics constructor)
0017 for protons creating G4LDMPhotons.
0018 The latter decays creating G4LDMHi and G4LDMHiBar LDM scalar particles. They
0019 can scatter on nucleons and electrons.
0020
0021 The first version has electromagnetic processes only. Hadron constructors can be added similarly
0022 to HadrN examples.
0023
0024 More LDM processes will be added according to experiment requirements
0025
0026
0027
0028 1- GEOMETRY DEFINITION
0029
0030 The geometry consists of a single block of a homogenous material,
0031 placed in a world.
0032
0033 Parameters define the geometry :
0034 - the material of the box
0035 - the thickness of the box
0036 - the tranverse dimension of the box
0037
0038 The default is 130 cm of tungsten.
0039 Equivalent UI commands are following:
0040 /testex/det/setMat G4_W
0041 /testex/det/sizeX 130 cm
0042 /testex/det/sizeYZ 30 cm
0043
0044 The default geometry is constructed in DetectorConstruction class,
0045 but all of the above parameters can be changed interactively via
0046 the commands defined in the DetectorMessenger class.
0047
0048 2- PHYSICS LIST
0049
0050 Physics Lists include EM standard physics and decay physics, additional
0051 dark matter particle physics imlemented inside PhysicsList method. By
0052 default DMLPhoton is defined with the mass 0.5 GeV.
0053 To define different mass of this photon or enable DMLHi, DMLHiBar
0054 command line commands should be applied.
0055
0056 3- AN EVENT : THE PRIMARY GENERATOR
0057
0058 The primary kinematic consists of a single particle which hits the
0059 block perpendicular to the input face. The type of the particle
0060 and its energy are set in the PrimaryGeneratorAction class, and can
0061 changed via the G4 build-in commands of ParticleGun class (see
0062 the macros provided with this example).
0063 The default is proton 100 GeV
0064
0065 4- HOW TO START ?
0066
0067 - execute Test in 'batch' mode from macro files
0068 % dmparticle dmparticle.in
0069 % dmparticle dmparticle.in 0.2 0.4
0070
0071 two extra numbers are masses in GeV of DMLPhoton and DMLHi
0072
0073 5- HISTOGRAMS
0074
0075 The result is five histograms:
0076 - energy deposition along the target
0077
0078 The histogram is saved in Root file.
0079
