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Remove obsolete printInfo from G4muDarkBremsstrahlung #38965

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Aug 4, 2022
Merged

Remove obsolete printInfo from G4muDarkBremsstrahlung #38965

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95f76de
Removed obsolete PrintInfo() function from G4muDarkBremsstrahlung
Aug 2, 2022
75acca3
Change G4muDarkBremsstrahlungModel to get muon mass from geant partic…
Aug 2, 2022
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2 changes: 0 additions & 2 deletions SimG4Core/CustomPhysics/interface/G4muDarkBremsstrahlung.h
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Expand Up @@ -20,8 +20,6 @@ class G4muDarkBremsstrahlung : public G4VEmProcess {

G4bool IsApplicable(const G4ParticleDefinition& p) override;

void PrintInfo() override;

void SetMethod(std::string method_in);

G4bool IsEnabled();
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2 changes: 2 additions & 0 deletions SimG4Core/CustomPhysics/interface/G4muDarkBremsstrahlungModel.h
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Expand Up @@ -21,6 +21,7 @@ struct ParamsForChi {
double AA;
double ZZ;
double MMA;
double MMu;
double EE0;
};
struct frame {
Expand Down Expand Up @@ -81,6 +82,7 @@ class G4muDarkBremsstrahlungModel : public G4VEmModel {
G4ParticleDefinition* theAPrime;
G4ParticleChangeForLoss* fParticleChange;
G4double MA;
G4double muonMass;
G4bool isMuon;

private:
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2 changes: 0 additions & 2 deletions SimG4Core/CustomPhysics/src/G4muDarkBremsstrahlung.cc
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Expand Up @@ -33,8 +33,6 @@ void G4muDarkBremsstrahlung::InitialiseProcess(const G4ParticleDefinition*) {
}
}

void G4muDarkBremsstrahlung::PrintInfo() {}

void G4muDarkBremsstrahlung::SetMethod(std::string method_in) {
((G4muDarkBremsstrahlungModel*)EmModel(1))->SetMethod(method_in);
return;
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42 changes: 19 additions & 23 deletions SimG4Core/CustomPhysics/src/G4muDarkBremsstrahlungModel.cc
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Expand Up @@ -35,8 +35,8 @@ G4muDarkBremsstrahlungModel::G4muDarkBremsstrahlungModel(const G4String& scalefi
SetParticle(p);
} //Verify that the particle is a muon.
theAPrime = G4APrime::APrime();
MA = G4APrime::APrime()->GetPDGMass() / CLHEP::GeV; //Get the A' mass.

MA = G4APrime::APrime()->GetPDGMass() / CLHEP::GeV; //Get the A' mass.
muonMass = G4MuonMinus::MuonMinusDefinition()->GetPDGMass() / CLHEP::GeV; //Get the muon mass
highKinEnergy = HighEnergyLimit();
lowKinEnergy = LowEnergyLimit();
fParticleChange = nullptr;
Expand Down Expand Up @@ -186,12 +186,9 @@ frame G4muDarkBremsstrahlungModel::GetMadgraphData(double E0)
G4double G4muDarkBremsstrahlungModel::DsigmaDx(double x, void* pp) {
ParamsForChi* params = (ParamsForChi*)pp;

//G4double Mel = 5.1E-04;
G4double Mmu = 0.106;

G4double beta = sqrt(1 - (params->MMA) * (params->MMA) / (params->EE0) / (params->EE0));
G4double num = 1. - x + x * x / 3.;
G4double denom = (params->MMA) * (params->MMA) * (1. - x) / x + Mmu * Mmu * x;
G4double denom = (params->MMA) * (params->MMA) * (1. - x) / x + (params->MMu) * (params->MMu) * x;
G4double DsDx = beta * num / denom;

return DsDx;
Expand All @@ -203,12 +200,12 @@ G4double G4muDarkBremsstrahlungModel::chi(double t, void* pp) {
* params->AA;
* params->ZZ;
* params->MMA;
* params->MMu;
* params->EE0;
*/
G4double Mel = 5.1E-04;
G4double MUp = 2.79;
G4double Mpr = 0.938;

G4double d = 0.164 / pow((params->AA), 2. / 3.);
G4double ap = 773.0 / Mel / pow((params->ZZ), 2. / 3.);
G4double a = 111.0 / Mel / pow((params->ZZ), 1. / 3.);
Expand Down Expand Up @@ -236,8 +233,6 @@ G4double G4muDarkBremsstrahlungModel::ComputeCrossSectionPerAtom(
}

E0 = E0 / CLHEP::GeV; //Change energy to GeV.
//G4double Mel = 5.1E-04;
G4double Mmu = 0.106;
if (E0 < 2. * MA)
return 0.;

Expand All @@ -249,12 +244,13 @@ G4double G4muDarkBremsstrahlungModel::ComputeCrossSectionPerAtom(
G4double tmax = MA * MA;

gsl_function F;
ParamsForChi alpha = {1.0, 1.0, 1.0, 1.0};
ParamsForChi alpha = {1.0, 1.0, 1.0, 1.0, 1.0};
F.function = &G4muDarkBremsstrahlungModel::chi;
F.params = &alpha;
alpha.AA = A;
alpha.ZZ = Z;
alpha.MMA = MA;
alpha.MMu = muonMass;
alpha.EE0 = E0;

//Integrate over chi.
Expand All @@ -270,8 +266,8 @@ G4double G4muDarkBremsstrahlungModel::ComputeCrossSectionPerAtom(
G.params = &alpha;
G4double xmin = 0;
G4double xmax = 1;
if ((Mmu / E0) > (MA / E0))
xmax = 1 - Mmu / E0;
if ((muonMass / E0) > (MA / E0))
xmax = 1 - muonMass / E0;
else
xmax = 1 - MA / E0;
G4double res, err;
Expand Down Expand Up @@ -312,7 +308,7 @@ G4DataVector* G4muDarkBremsstrahlungModel::ComputePartialSumSigma(const G4Materi
for (G4int i = 0; i < nElements; i++) {
cross += theAtomNumDensityVector[i] *
ComputeCrossSectionPerAtom(
particle, kineticEnergy, (*theElementVector)[i]->GetZ(), (*theElementVector)[i]->GetA(), cut);
particle, kineticEnergy, (*theElementVector)[i]->GetZ(), (*theElementVector)[i]->GetN(), cut);
dv->push_back(cross);
}
return dv;
Expand Down Expand Up @@ -340,26 +336,26 @@ void G4muDarkBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticl
if (tmin >= tmax) {
return;
} // limits of the energy sampling
G4double Mmu = 0.106;

E0 = E0 / CLHEP::GeV; //Convert the energy to GeV, the units used in the sampling files.

frame data = GetMadgraphData(E0);
double EAcc, Pt, P, PhiAcc;
if (method == "forward_only") {
EAcc = (data.fEl->E() - Mmu) / (data.E - Mmu - MA) * (E0 - Mmu - MA);
EAcc = Mmu + EAcc;
EAcc = (data.fEl->E() - muonMass) / (data.E - muonMass - MA) * (E0 - muonMass - MA);
EAcc = muonMass + EAcc;
Pt = data.fEl->Pt();
P = sqrt(EAcc * EAcc - Mmu * Mmu);
P = sqrt(EAcc * EAcc - muonMass * muonMass);
PhiAcc = data.fEl->Phi();
int i = 0;
while (Pt * Pt + Mmu * Mmu > EAcc * EAcc) //Skip events until the Pt is less than the energy.
while (Pt * Pt + muonMass * muonMass > EAcc * EAcc) //Skip events until the Pt is less than the energy.
{
i++;
data = GetMadgraphData(E0);
EAcc = (data.fEl->E() - Mmu) / (data.E - Mmu - MA) * (E0 - Mmu - MA);
EAcc = Mmu + EAcc;
EAcc = (data.fEl->E() - muonMass) / (data.E - muonMass - MA) * (E0 - muonMass - MA);
EAcc = muonMass + EAcc;
Pt = data.fEl->Pt();
P = sqrt(EAcc * EAcc - Mmu * Mmu);
P = sqrt(EAcc * EAcc - muonMass * muonMass);
PhiAcc = data.fEl->Phi();

if (i > 10000) {
Expand All @@ -372,7 +368,7 @@ void G4muDarkBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticl
TLorentzVector* newcm = new TLorentzVector(data.cm->X(), data.cm->Y(), data.cm->Z() - ediff, data.cm->E() - ediff);
el->Boost(-1. * data.cm->BoostVector());
el->Boost(newcm->BoostVector());
double newE = (data.fEl->E() - Mmu) / (data.E - Mmu - MA) * (E0 - Mmu - MA);
double newE = (data.fEl->E() - muonMass) / (data.E - muonMass - MA) * (E0 - muonMass - MA);
el->SetE(newE);
EAcc = el->E();
Pt = el->Pt();
Expand All @@ -387,7 +383,7 @@ void G4muDarkBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticl

EAcc = EAcc * CLHEP::GeV; //Change the energy back to MeV, the internal GEANT unit.

G4double muon_mass_mev = 105.6;
G4double muon_mass_mev = muonMass * CLHEP::GeV;
G4double momentum = sqrt(EAcc * EAcc - muon_mass_mev * muon_mass_mev); //Muon momentum in MeV.
G4ThreeVector newDirection;
double ThetaAcc = std::asin(Pt / P);
Expand Down