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