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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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dmparticle
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V. Grichine (25.03.2017)
Geant4 application for testing of dark matter particles and processes
(based on TestEm8 and monopole examples)
This is very preliminary and simplified Geant4 example for light dark matter (LDM) particles.
It consists of LDM bremsstrahlung process (in G4LDMPhysics constructor)
for protons creating G4LDMPhotons.
The latter decays creating G4LDMHi and G4LDMHiBar LDM scalar particles. They
can scatter on nucleons and electrons.
The first version has electromagnetic processes only. Hadron constructors can be added similarly
to HadrN examples.
More LDM processes will be added according to experiment requirements
1- GEOMETRY DEFINITION
The geometry consists of a single block of a homogenous material,
placed in a world.
Parameters define the geometry :
- the material of the box
- the thickness of the box
- the tranverse dimension of the box
The default is 130 cm of tungsten.
Equivalent UI commands are following:
/testex/det/setMat G4_W
/testex/det/sizeX 130 cm
/testex/det/sizeYZ 30 cm
The default geometry is constructed in DetectorConstruction class,
but all of the above parameters can be changed interactively via
the commands defined in the DetectorMessenger class.
2- PHYSICS LIST
Physics Lists include EM standard physics and decay physics, additional
dark matter particle physics imlemented inside PhysicsList method. By
default DMLPhoton is defined with the mass 0.5 GeV.
To define different mass of this photon or enable DMLHi, DMLHiBar
command line commands should be applied.
3- AN EVENT : THE PRIMARY GENERATOR
The primary kinematic consists of a single particle which hits the
block perpendicular to the input face. The type of the particle
and its energy are set in the PrimaryGeneratorAction class, and can
changed via the G4 build-in commands of ParticleGun class (see
the macros provided with this example).
The default is proton 100 GeV
4- HOW TO START ?
- execute Test in 'batch' mode from macro files
% dmparticle dmparticle.in
% dmparticle dmparticle.in 0.2 0.4
two extra numbers are masses in GeV of DMLPhoton and DMLHi
5- HISTOGRAMS
The result is five histograms:
- energy deposition along the target
The histogram is saved in Root file.
Gabriele Cosmo