|Message: Re: Electromangnetic physics||Not Logged In (login)|
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Hi, Vladimer, These physicslists are NOT equivalent for EM in our simulation!! For Muon physicslist, in hadronic package (MuonPhysics.cc), the processes added like this, pManager = G4MuonPlus::MuonPlus()->GetProcessManager(); pManager->AddProcess(&fMuPlusIonisation, ordInActive,2,2); pManager->AddDiscreteProcess(&fMuPlusBremsstrahlung); pManager->AddDiscreteProcess(&fMuPlusPairProduction); pManager->AddProcessp(&fMuPlusMultipleScattering); pManager->SetProcessOrdering(&fMuPlusMultipleScattering, idxAlongStep, 1); pManager->SetProcessOrdering(&fMuPlusMultipleScattering, idxPostStep, 1); ... similar for MuonMinus But in novice example N02, the Muon processes are (ExN02PhysicsList.cc) pmanager->AddProcess(new G4Multiplescattering,-1,1,1); pmanager->AddProcess(new G4MuIonisation, -1,2,2); pmanager->AddProcess(new G4MuBremsstrahlung, -1,3,3); pmanager->AddProcess(new G4MuPairProduction, -1,4,4); If the two physicslists are equivalent, for a single MuonPlus particle, we should get the same result. But our momentum resolution is different in these two cases, the first one gives 28 MeV, the second one gives 5 MeV, 5 MeV seems to be correct in our simulation. We declare the only differnce in our simulation is the substitution of the Muon Physics from N02 to hadronic muon package. We are using GEANT4.70+p01. I am wondering if the muon physics list in hadronic package is the standard EM for muon. Huaimin Liu IHEP, Beijing
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