|Message: Re: Electron beam from muon decay||Not Logged In (login)|
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I don't know whether or not your muon beam is polarized. If it is you must use code found in /examples/extended/field05 to assign the muon polarization:
as well as set the muon decay channel to G4MuonDecayChannelWithSpin and replace the defaul G4Decay process with G4DecayWithSpin. (see F05PhysicsList::ConstructParticle and F05PhysicsList::ConstructProcess).
I don't know how you can a priori know the diretion of the decay electron/positron from a muon decay in flight, especially if the muon beam has divergence and momentum spread, the muons have a finite lifetime, the beam may be polarized etc.
Don't know why you start 400m upstream unless your decay electrons starting that far upstream can reach your detector.