Hi all,
I’m doing some study about Fractional charged particles.
Now I want to processing the MC simulation with Geant4, but I didn’t find a fractional charged particle in particle list. Then I tried to modify the charge of muon, but It didn’t work, I modified the source code like this:
I wonder weather I can modify the muon’s charge to do this simulation or I need to create a new fractional charged particle.
Thanks for your help!
Hello,
in general it is not a good idea to modify parameters of standard particles. I would suggest to have a look into $G4INSTALL/examples/extended/exoticphysics
There are two examples so far - magnetic monopole and dark matter photon. In both we suggest that a new particle is created by user, corresponding physical processes are added on top of physics for ordinary particles.
VI
Hi，
Thanks for your instruction, I’ve successfully created a fractional charged particle and it can be used in my model.
The PhysicsList in my model uses the G4VModulePhysicsList(), so I need to write a FcpPhysicsList for my fcp particle which was derived from G4MonopolePhysics.
I set the mass to 120 MeV, and charge to 0.66 e. it worked well with G4hMultipleScattering and G4hIonisation. I also want to add the Bremsstrahlung, but it didn’t work.
Thank you for your help!
Hello,
bremsstrahlung and pair production have non-zero cross sections above 1 GeV.
Order of processes are a bit different:
(new G4hMultipleScattering, -1, 1, -1)
(new G4hIonisation, -1, 2, 1)
if needed:
(new G4hBremsstrahlung, -1, -1, 2)
(new G4hPairProduction, -1, -1, 3)
VI
Hi,
When I added the process as you wrote, it still didn’t work whether the mass is above 1GeV or still 120MeV. but when I remove the Bremsstrahlung process, it works well.
(There are some mistake in the last version reply, so I revised it.)
Thank you!
I’m looking forward to your replay!
