double Propagation::ExtractPhotonEnergyMC(double z, Process &proc) const {
double esoft = 0;
//double snew = 0;
double emin = proc.GetMin();
Particle pi = proc.GetIncidentParticle();
Particle pb = proc.GetTargetParticle();
double Epi = pi.GetEnergy();
double m = pi.GetMass();
esoft = ShootPhotonEnergyMC(emin / (4.0 * Epi), z);
//snew = 4 * Epi * esoft + m * m;
pb.SetEnergy(esoft);
proc.SetTargetParticle(pb);
proc.SetCMEnergy();
return esoft;
}
double Propagation::ExtractMinDist(Process &proc, int type, double R, double R2,
std::vector<double> &Etarget) const {
double min_dist1 = 0;
double min_dist2 = 0;
Process proc1(proc);
Process proc2(proc);
double tmp_lambda1 = 0;
double tmp_lambda2 = 0;
Particle pt;
pt.SetType(0);
pt.Setz(proc.GetIncidentParticle().Getz());
if (type == 22) {
if (Etarget[0]) {
proc1.SetName(Process::PP);
pt.SetEnergy(Etarget[0]);
proc1.SetTargetParticle(pt);
proc1.SetCMEnergy();
tmp_lambda1 = GetLambdaTab(proc1, Process::PP);
min_dist1 = -tmp_lambda1 * log(R);
}
if (Etarget[1]) {
pt.SetEnergy(Etarget[1]);
proc2.SetTargetParticle(pt);
proc2.SetCMEnergy();
tmp_lambda2 = GetLambdaTab(proc2, Process::DPP);
min_dist2 = -tmp_lambda2 * log(R2);
}
#ifdef DEBUG_ELECA
std::cerr << "comparing 2 mindists: " << min_dist1 << "("
<< tmp_lambda1 << ") vs " << min_dist2 << " ( "
<< tmp_lambda2 << ") " << std::endl;
#endif
if (min_dist2 < min_dist1) {
min_dist1 = min_dist2;
proc.SetName(Process::DPP);
pt.SetEnergy(Etarget[1]);
proc.SetTargetParticle(pt);
proc.SetCMEnergy();
} else {
proc.SetName(Process::PP);
pt.SetEnergy(Etarget[0]);
proc.SetTargetParticle(pt);
proc.SetCMEnergy();
}
} //end if type 0
else if (abs(type) == 11) {
proc1.SetName(Process::ICS);
pt.SetEnergy(Etarget[0]);
proc1.SetTargetParticle(pt);
tmp_lambda1 = GetLambdaTab(proc1, Process::ICS);
min_dist1 = -tmp_lambda1 * log(R);
proc2.SetName(Process::TPP);
pt.SetEnergy(Etarget[1]);
proc2.SetTargetParticle(pt);
tmp_lambda2 = GetLambdaTab(proc2, Process::TPP);
min_dist2 = -tmp_lambda2 * log(R2);
#ifdef DEBUG_ELECA
std::cerr << "comparing 2 mindists: " << min_dist1 << "("
<< tmp_lambda1 << ") vs " << min_dist2 << " ( "
<< tmp_lambda2 << ") " << std::endl;
#endif
if (min_dist2 < min_dist1) {
min_dist1 = min_dist2;
proc.SetName(Process::TPP);
pt.SetEnergy(Etarget[1]);
proc.SetTargetParticle(pt);
proc.SetCMEnergy();
} else {
proc.SetName(Process::ICS);
pt.SetEnergy(Etarget[0]);
proc.SetTargetParticle(pt);
proc.SetCMEnergy();
}
} //else e+/e-
else
std::cerr << "something wrong in particle type ( " << type
<< ". Propagation of photons and e+/e- is the only allowed.)"
<< std::endl;
return min_dist1;
}