SteppingAction.cc

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#include "SteppingAction.hh"
#include "RunAction.hh"
#include "G4SteppingManager.hh"
#include "G4VProcess.hh"
#include "G4ParticleTypes.hh"

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SteppingAction::SteppingAction(RunAction* RuAct)
:G4UserSteppingAction(),fRunAction(RuAct)
{ 
 fMuonMass = G4MuonPlus::MuonPlus()->GetPDGMass();
}

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SteppingAction::~SteppingAction()
{ }

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void SteppingAction::UserSteppingAction(const G4Step* aStep)
{
 const G4VProcess* process = aStep->GetPostStepPoint()->GetProcessDefinedStep();
 if (process == 0) return;  
 G4String processName = process->GetProcessName();
 fRunAction->CountProcesses(processName); //count processes
  
 if (processName != "GammaToMuPair") return;
 
 G4StepPoint* PrePoint = aStep->GetPreStepPoint();  
 G4double      EGamma  = PrePoint->GetTotalEnergy();
 G4ThreeVector PGamma  = PrePoint->GetMomentum();
    
 G4double      Eplus(0), Eminus(0);
 G4ThreeVector Pplus   , Pminus;
 const G4TrackVector* secondary = fpSteppingManager->GetSecondary();
 for (size_t lp=0; lp<(*secondary).size(); lp++) {
   if ((*secondary)[lp]->GetDefinition()==G4MuonPlus::MuonPlusDefinition()) {
     Eplus  = (*secondary)[lp]->GetTotalEnergy();
     Pplus  = (*secondary)[lp]->GetMomentum();
   } else {
     Eminus = (*secondary)[lp]->GetTotalEnergy();
     Pminus = (*secondary)[lp]->GetMomentum();                 
   }
 }
               
 G4double xPlus = Eplus/EGamma, xMinus = Eminus/EGamma;
 G4double thetaPlus = PGamma.angle(Pplus), thetaMinus = PGamma.angle(Pminus);
 G4double GammaPlus = Eplus/fMuonMass;
 G4double GammaMinus= Eminus/fMuonMass;
 
 G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();

 if(0.0 == thetaPlus || 0.0 == thetaMinus) {
   G4cout << "SteppingAction: "
          << "thetaPlus= " << thetaPlus << " thetaMinus= " << thetaMinus
          << " gamPlus= " << GammaPlus << " gamMinus= " <<  GammaMinus
          << "  " << thetaPlus *GammaPlus - thetaMinus*GammaMinus << G4endl;
   return;
 }
 analysisManager->FillH1(1,1./(1.+std::pow(thetaPlus*GammaPlus,2)));
 analysisManager->FillH1(2,std::log10(thetaPlus*GammaPlus));

 analysisManager->FillH1(3,std::log10(thetaMinus*GammaMinus));
 analysisManager->FillH1(4,std::log10(std::fabs(thetaPlus *GammaPlus
                                              -thetaMinus*GammaMinus)));
 
 analysisManager->FillH1(5,xPlus);
 analysisManager->FillH1(6,xMinus);
}

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