MECInteractionListGenerator.cxx

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//____________________________________________________________________________
/*
 Copyright (c) 2003-2025, The GENIE Collaboration
 For the full text of the license visit http://copyright.genie-mc.org
 
 Costas Andreopoulos <c.andreopoulos \at cern.ch>
 University of Liverpool
*/
//____________________________________________________________________________
 
#include "Framework/Algorithm/AlgConfigPool.h"
#include "Framework/EventGen/InteractionList.h"
#include "Framework/Interaction/Interaction.h"
#include "Framework/Messenger/Messenger.h"
#include "Framework/ParticleData/PDGCodes.h"
#include "Framework/ParticleData/PDGUtils.h"
#include "Physics/Multinucleon/EventGen/MECInteractionListGenerator.h"
 
using namespace genie;
 
//___________________________________________________________________________
MECInteractionListGenerator::MECInteractionListGenerator() :
InteractionListGeneratorI("genie::MECInteractionListGenerator")
{
 
}
//___________________________________________________________________________
MECInteractionListGenerator::MECInteractionListGenerator(string config):
InteractionListGeneratorI("genie::MECInteractionListGenerator", config)
{
 
}
//___________________________________________________________________________
MECInteractionListGenerator::~MECInteractionListGenerator()
{
 
}
//___________________________________________________________________________
InteractionList *
  MECInteractionListGenerator::CreateInteractionList(
      const InitialState & init_state) const
{
  LOG("IntLst", pINFO) << "InitialState = " << init_state.AsString();
 
  int nupdg  = init_state.ProbePdg();
  int tgtpdg = init_state.Tgt().Pdg();
 
  const Target & target = init_state.Tgt();
 
  if(target.A() < 4) return 0;
 
  InteractionList * intlist = new InteractionList;
 
  if(!fSetDiNucleonCode&&fIsCC) {
         LOG("IntLst", pWARN) << "fIsCC(val) = " << fIsCC;
      Interaction * interaction = Interaction::MECCC(tgtpdg, nupdg, 0.0);
      intlist->push_back(interaction);
  }
 
  if(!fSetDiNucleonCodeEM&&fIsEM) {
   LOG("IntLst", pWARN) << "fIsCC(val) = " << fIsCC;
      Interaction * interaction = Interaction::MECEM(tgtpdg, nupdg, 0.0);
      intlist->push_back(interaction);
  }
 
  const int nc = 3;
  const int nucleon_cluster[nc] = {
    kPdgClusterNN, kPdgClusterNP, kPdgClusterPP };
 
  for(int ic = 0; ic < nc; ic++) {
     int ncpdg = nucleon_cluster[ic];
     if(fIsCC&&fSetDiNucleonCode) {
       bool allowed = false;
       LOG("IntLst", pWARN) << "fIsCC(emp) = " << fIsCC;
       if(pdg::IsNeutrino(nupdg)) {
         // neutrino CC => final state primary lepton is -1
         // therefore the nucleon-cluster charge needs to be incremented by +1.
         if(ncpdg == kPdgClusterNN || ncpdg == kPdgClusterNP) {
           allowed = true;
         }
       }
       else
         if(pdg::IsAntiNeutrino(nupdg)) {
           // anti-neutrino CC => final state primary lepton is +1
           // therefore the nucleon-cluster charge needs to be incremented by -1.
           if(ncpdg == kPdgClusterNP || ncpdg == kPdgClusterPP) {
             allowed = true;
           }
         }
       if(allowed) {
         Interaction * interaction =
           Interaction::MECCC(tgtpdg,ncpdg,nupdg,0);
         intlist->push_back(interaction);
       }
     }//CC?
     else
       if(fIsNC)
     {
       LOG("IntLst", pWARN) << "fIsNC = " << fIsNC;
       Interaction * interaction =
         Interaction::MECNC(tgtpdg,ncpdg,nupdg,0);
       intlist->push_back(interaction);
     }//NC?
     else
       if(fIsEM&&fSetDiNucleonCodeEM) {
         LOG("IntLst", pWARN) << "fIsEM = " << fIsEM << "  ncpdg = " << ncpdg;
         Interaction * interaction =
           Interaction::MECEM(tgtpdg,ncpdg,nupdg,0);
         intlist->push_back(interaction);
       }//EM?
  }
  return intlist;
 
}
//___________________________________________________________________________
void MECInteractionListGenerator::Configure(const Registry & config)
{
  Algorithm::Configure(config);
  this->LoadConfigData();
}
//____________________________________________________________________________
void MECInteractionListGenerator::Configure(string config)
{
  Algorithm::Configure(config);
  this->LoadConfigData();
}
//____________________________________________________________________________
void MECInteractionListGenerator::LoadConfigData(void)
{
  GetParamDef( "is-CC", fIsCC, false ) ;
  GetParamDef( "is-NC", fIsNC, false ) ;
  GetParamDef( "is-EM", fIsEM, false ) ;
 
  GetParam( "SetDiNucleonCode", fSetDiNucleonCode ) ;
  GetParam( "SetDiNucleonCodeEM", fSetDiNucleonCodeEM ) ;
 
}
//____________________________________________________________________________