CMSMonopolePhysics.cc

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#include "SimG4Core/PhysicsLists/interface/CMSMonopolePhysics.h"
#include "SimG4Core/PhysicsLists/interface/MonopoleTransportation.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "G4ParticleDefinition.hh"
#include "G4ProcessManager.hh"

#include "G4StepLimiter.hh"
#include "G4hMultipleScattering.hh"
#include "G4hIonisation.hh"
#include "G4mplIonisation.hh"
#include "G4mplIonisationWithDeltaModel.hh"

#include "CLHEP/Units/GlobalSystemOfUnits.h"

CMSMonopolePhysics::CMSMonopolePhysics(const HepPDT::ParticleDataTable* pdt, const edm::ParameterSet& p)
    : G4VPhysicsConstructor("Monopole Physics") {
  verbose = p.getUntrackedParameter<int>("Verbosity", 0);
  magCharge = p.getUntrackedParameter<int>("MonopoleCharge", 1);
  deltaRay = p.getUntrackedParameter<bool>("MonopoleDeltaRay", true);
  multiSc = p.getUntrackedParameter<bool>("MonopoleMultiScatter", false);
  transport = p.getUntrackedParameter<bool>("MonopoleTransport", true);
  double mass = p.getUntrackedParameter<double>("MonopoleMass", 200);
  if (pdt && mass > 0.0) {
    int ii = 0;
    for (HepPDT::ParticleDataTable::const_iterator p = pdt->begin(); p != pdt->end(); ++p, ++ii) {
      HepPDT::ParticleData particle = (p->second);
      std::string particleName = (particle.name()).substr(0, 8);
      if (strcmp(particleName.c_str(), "Monopole") == 0) {
        names.push_back(particle.name());
        masses.push_back(mass * CLHEP::GeV);
        elCharges.push_back((int)(particle.charge()));
        pdgEncodings.push_back(particle.pid());
        monopoles.push_back(nullptr);
        if (verbose > 0)
          G4cout << "CMSMonopolePhysics: Monopole[" << ii << "] " << particleName << " Mass " << particle.mass()
                 << " GeV, Magnetic Charge " << magCharge << ", Electric Charge " << particle.charge() << G4endl;
      } else if (strcmp(particleName.c_str(), "AntiMono") == 0) {
        names.push_back(particle.name());
        masses.push_back(mass * CLHEP::GeV);
        elCharges.push_back((int)(particle.charge()));
        pdgEncodings.push_back(particle.pid());
        monopoles.push_back(nullptr);
        if (verbose > 0)
          G4cout << "CMSMonopolePhysics: Monopole[" << ii << "] " << particleName << " Mass " << particle.mass()
                 << " GeV, Magnetic Charge " << magCharge << ", Electric Charge " << particle.charge() << G4endl;
      }
    }
  }
  if (verbose > 0)
    G4cout << "CMSMonopolePhysics has " << names.size() << " monopole candidates and delta Ray option " << deltaRay
           << G4endl;
}

CMSMonopolePhysics::~CMSMonopolePhysics() {}

void CMSMonopolePhysics::ConstructParticle() {
  for (unsigned int ii = 0; ii < names.size(); ++ii) {
    // monopoles are created once in the master thread
    if (!monopoles[ii]) {
      G4int mc = (pdgEncodings[ii] >= 0) ? magCharge : -magCharge;
      Monopole* mpl = new Monopole(names[ii], pdgEncodings[ii], masses[ii], mc, elCharges[ii]);
      monopoles[ii] = mpl;
      if (verbose > 0)
        G4cout << "Create Monopole " << names[ii] << " of mass " << masses[ii] / CLHEP::GeV << " GeV, magnetic charge "
               << mc << ", electric charge " << elCharges[ii] << " and PDG encoding " << pdgEncodings[ii] << " at "
               << monopoles[ii] << G4endl;
    }
  }
}

void CMSMonopolePhysics::ConstructProcess() {
  // Add standard EM Processes
  if (verbose > 0) {
    G4cout << "### CMSMonopolePhysics ConstructProcess()" << G4endl;
  }
  G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();

  for (unsigned int ii = 0; ii < monopoles.size(); ++ii) {
    if (monopoles[ii]) {
      Monopole* mpl = monopoles[ii];
      G4ProcessManager* pmanager = mpl->GetProcessManager();
      if (!pmanager) {
        std::ostringstream o;
        o << "Monopole without a Process Manager";
        throw edm::Exception(edm::errors::Configuration, o.str().c_str());
        return;
      }

      G4double magn = mpl->MagneticCharge();
      G4double mass = mpl->GetPDGMass();
      if (verbose > 1) {
        G4cout << "### CMSMonopolePhysics instantiates for " << mpl->GetParticleName() << " at " << mpl << " Mass "
               << mass / CLHEP::GeV << " GeV Mag " << magn << " Process manager " << pmanager << G4endl;
      }

      if (magn != 0.0) {
        G4int idxt(0);
        pmanager->RemoveProcess(idxt);
        pmanager->AddProcess(new MonopoleTransportation(mpl, verbose), -1, 0, 0);
      }

      if (mpl->GetPDGCharge() != 0.0) {
        if (multiSc) {
          G4hMultipleScattering* hmsc = new G4hMultipleScattering();
          ph->RegisterProcess(hmsc, mpl);
        }
        G4hIonisation* hioni = new G4hIonisation();
        ph->RegisterProcess(hioni, mpl);
      }
      if (magn != 0.0) {
        G4mplIonisation* mplioni = new G4mplIonisation(magn);
        if (!deltaRay) {
          G4mplIonisationWithDeltaModel* ion = new G4mplIonisationWithDeltaModel(magn, "PAI");
          ion->SetParticle(mpl);
          mplioni->AddEmModel(0, ion, ion);
        }
        ph->RegisterProcess(mplioni, mpl);
      }
      pmanager->AddDiscreteProcess(new G4StepLimiter());
      if (verbose > 1) {
        pmanager->DumpInfo();
      }
    }
  }
}