KaonPhysics.cxx

#include "SimCore/KaonPhysics.h"
 
namespace simcore {
KaonPhysics::KaonPhysics(const G4String& name,
                         const framework::config::Parameters& parameters)
    : G4VPhysicsConstructor(name) {
  kplus_branching_ratios_ =
      parameters.get<std::vector<double>>("kplus_branching_ratios");
  kminus_branching_ratios_ =
      parameters.get<std::vector<double>>("kminus_branching_ratios");
  k0l_branching_ratios_ =
      parameters.get<std::vector<double>>("k0l_branching_ratios");
  k0s_branching_ratios_ =
      parameters.get<std::vector<double>>("k0s_branching_ratios");
  kplus_lifetime_factor_ = parameters.get<double>("kplus_lifetime_factor");
  kminus_lifetime_factor_ = parameters.get<double>("kminus_lifetime_factor");
  k0l_lifetime_factor_ = parameters.get<double>("k0l_lifetime_factor");
  k0s_lifetime_factor_ = parameters.get<double>("k0s_lifetime_factor");
}
void KaonPhysics::setDecayProperties(
    G4ParticleDefinition* kaon, const std::vector<double>& branching_ratios,
    double lifetime_factor) const {
  auto table{kaon->GetDecayTable()};
  if (!table) {
    EXCEPTION_RAISE("KaonPhysics", "Unable to get the decay table from " +
                                       kaon->GetParticleName());
  }
  ldmx_log(trace) << "Decay details (" << kaon->GetParticleName()
                  << ") before setting branching ratios and lifetimes";
  dumpDecayDetails(kaon);
  kaon->SetPDGLifeTime(kaon->GetPDGLifeTime() * lifetime_factor);
  if (kaon == G4KaonZeroLong::Definition()) {
    (*table)[KaonZeroLongDecayChannel::pi0_pi0_pi0]->SetBR(
        branching_ratios[KaonZeroLongDecayChannel::pi0_pi0_pi0]);
    (*table)[KaonZeroLongDecayChannel::pi0_pip_pim]->SetBR(
        branching_ratios[KaonZeroLongDecayChannel::pi0_pip_pim]);
    (*table)[KaonZeroLongDecayChannel::pip_e_nu]->SetBR(
        branching_ratios[KaonZeroLongDecayChannel::pip_e_nu]);
    (*table)[KaonZeroLongDecayChannel::pim_e_nu]->SetBR(
        branching_ratios[KaonZeroLongDecayChannel::pim_e_nu]);
    (*table)[KaonZeroLongDecayChannel::pim_mu_nu]->SetBR(
        branching_ratios[KaonZeroLongDecayChannel::pim_mu_nu]);
    (*table)[KaonZeroLongDecayChannel::pip_mu_nu]->SetBR(
        branching_ratios[KaonZeroLongDecayChannel::pip_mu_nu]);
  } else if (kaon == G4KaonZeroShort::Definition()) {
    (*table)[KaonZeroShortDecayChannel::pip_pim]->SetBR(
        branching_ratios[KaonZeroShortDecayChannel::pip_pim]);
    (*table)[KaonZeroShortDecayChannel::pi0_pi0]->SetBR(
        branching_ratios[KaonZeroShortDecayChannel::pi0_pi0]);
  } else {
    (*table)[ChargedKaonDecayChannel::mu_nu]->SetBR(
        branching_ratios[ChargedKaonDecayChannel::mu_nu]);
    (*table)[ChargedKaonDecayChannel::pi_pi0]->SetBR(
        branching_ratios[ChargedKaonDecayChannel::pi_pi0]);
    (*table)[ChargedKaonDecayChannel::pi_pi_pi]->SetBR(
        branching_ratios[ChargedKaonDecayChannel::pi_pi_pi]);
    (*table)[ChargedKaonDecayChannel::pi_pi0_pi0]->SetBR(
        branching_ratios[ChargedKaonDecayChannel::pi_pi0_pi0]);
    (*table)[ChargedKaonDecayChannel::pi0_e_nu]->SetBR(
        branching_ratios[ChargedKaonDecayChannel::pi0_e_nu]);
    (*table)[ChargedKaonDecayChannel::pi0_mu_nu]->SetBR(
        branching_ratios[ChargedKaonDecayChannel::pi0_mu_nu]);
  }
  ldmx_log(trace) << "Decay details (" << kaon->GetParticleName()
                  << ") after setting branching ratios and lifetimes"
                  << std::endl;
  dumpDecayDetails(kaon);
}
void KaonPhysics::ConstructParticle() {
  auto kaon_plus{G4KaonPlus::Definition()};
  auto kaon_minus{G4KaonMinus::Definition()};
  auto kaon_long{G4KaonZeroLong::Definition()};
  auto kaon_short{G4KaonZeroShort::Definition()};
 
  if (!kaon_plus || !kaon_minus || !kaon_long || !kaon_short) {
    EXCEPTION_RAISE("KaonPhysics",
                    "Unable to get the charged kaon particle definitions, "
                    "something is very wrong with the configuration.");
  }
  setDecayProperties(kaon_plus, kplus_branching_ratios_,
                     kplus_lifetime_factor_);
  setDecayProperties(kaon_minus, kminus_branching_ratios_,
                     kminus_lifetime_factor_);
  setDecayProperties(kaon_long, k0l_branching_ratios_, k0l_lifetime_factor_);
  setDecayProperties(kaon_short, k0s_branching_ratios_, k0s_lifetime_factor_);
}
 
void KaonPhysics::dumpDecayDetails(const G4ParticleDefinition* kaon) const {
  ldmx_log(trace) << "Decay table details for " << kaon->GetParticleName()
                  << std::scientific << std::setprecision(15)
                  << " (PDG Lifetime " << kaon->GetPDGLifeTime() << ")"
                  << std::endl;
  auto* table{kaon->GetDecayTable()};
  if (not table) {
    ldmx_log(error) << "No Kaon decay table.";
    return;
  }
  const int entries{table->entries()};
  for (auto i{0}; i < entries; ++i) {
    const auto channel{(*table)[i]};
    const auto daughters{channel->GetNumberOfDaughters()};
    std::string products{};
    // N-1 to avoid extra " + "
    for (auto j{0}; j < daughters; ++j) {
      auto* d{channel->GetDaughter(j)};
      if (d) {
        products += d->GetParticleName();
      } else {
        products += "NULL";
      }
      if (j < daughters - 1) {
        // only add '+' when there are more to come
        products += " + ";
      }
    }
    ldmx_log(trace) << "Channel " << i << " (" << kaon->GetParticleName()
                    << " -> " << products << ") Kinematics type "
                    << channel->GetKinematicsName() << " with BR "
                    << channel->GetBR() << std::endl;
  }
}
 
}  // namespace simcore