CustomParticleFactory.cc

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#include <fstream>
#include <iomanip>
#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <set>
#include <locale>     

#include "SimG4Core/CustomPhysics/interface/CustomPDGParser.h"
#include "SimG4Core/CustomPhysics/interface/CustomParticle.h"
#include "SimG4Core/CustomPhysics/interface/CustomParticleFactory.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ParameterSet/interface/FileInPath.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include <G4ParticleTable.hh>
#include "G4DecayTable.hh"
#include <G4PhaseSpaceDecayChannel.hh>
#include "G4ProcessManager.hh"

using namespace CLHEP;

bool CustomParticleFactory::loaded = false;
std::set<G4ParticleDefinition *> CustomParticleFactory::m_particles;

bool CustomParticleFactory::isCustomParticle(G4ParticleDefinition *particle)
{
  return (m_particles.find(particle)!=m_particles.end());
}

void CustomParticleFactory::loadCustomParticles(const std::string & filePath){
  if(loaded) return;
  loaded = true;

  std::ifstream configFile(filePath.c_str());

  std::string line;
  edm::LogInfo("SimG4CoreCustomPhysics") 
    <<"CustomParticleFactory: Reading Custom Particle and G4DecayTable from \n" 
    << filePath; 
  // This should be compatible IMO to SLHA 
  G4ParticleTable* theParticleTable = G4ParticleTable::GetParticleTable();
  while(getline(configFile,line)){
    line.erase(0, line.find_first_not_of(" \t"));         // Remove leading whitespace.
    if (line.length()==0 || line.at(0) == '#') continue;  // Skip blank lines and comments.  
    if (ToLower(line).find("block") < line.npos &&        // The mass table begins with a line containing "BLOCK MASS".  
    ToLower(line).find("mass")  < line.npos) {
      edm::LogInfo("SimG4CoreCustomPhysics") <<"CustomParticleFactory: Retrieving mass table."; 
      getMassTable(&configFile);
    }
    if(line.find("DECAY")<line.npos){
      int pdgId;
      double width; 
      std::string tmpString;
      std::stringstream lineStream(line);
      lineStream >> tmpString >> pdgId >> width; 
      // assume SLHA format, e.g.: DECAY  1000021  5.50675438E+00   # gluino decays
      edm::LogInfo("SimG4CoreCustomPhysics") 
    <<"CustomParticleFactory: entry to G4DecayTable: pdgID, width " << pdgId << ",  " << width; 
      G4DecayTable* aDecayTable = getDecayTable(&configFile, pdgId);      
      G4ParticleDefinition *aParticle     = theParticleTable->FindParticle(pdgId);
      G4ParticleDefinition *aAntiParticle = theParticleTable->FindAntiParticle(pdgId);
      if (!aParticle) continue;    
      aParticle->SetDecayTable(aDecayTable); 
      aParticle->SetPDGStable(false);
      aParticle->SetPDGLifeTime(1.0/(width*GeV)*6.582122e-22*MeV*s);      
      if(aAntiParticle && aAntiParticle->GetPDGEncoding()!=pdgId){  
    aAntiParticle->SetDecayTable(getAntiDecayTable(pdgId,aDecayTable)); 
    aAntiParticle->SetPDGStable(false);
    aAntiParticle->SetPDGLifeTime(1.0/(width*GeV)*6.582122e-22*MeV*s);
      }         
    }
  }
}

void CustomParticleFactory::addCustomParticle(int pdgCode, double mass, const std::string & name){
  
  if(abs(pdgCode)%100 <14 && abs(pdgCode) / 1000000 == 0){
    edm::LogError("") << "Pdg code too low " << pdgCode << " "<<abs(pdgCode) / 1000000; 
    return;
  }
    
  G4String pType="custom";
  G4String pSubType="";
  G4double spectatormass = 0.0;
  G4ParticleDefinition* spectator = nullptr; 
  if(CustomPDGParser::s_isRHadron(pdgCode)) pType = "rhadron";
  if(CustomPDGParser::s_isSLepton(pdgCode)) pType = "sLepton";
  if(CustomPDGParser::s_isMesonino(pdgCode)) pType = "mesonino";
  if(CustomPDGParser::s_isSbaryon(pdgCode)) pType = "sbaryon";
 
  double massGeV =mass*GeV;
  double width = 0.0*MeV;
  double charge = eplus* CustomPDGParser::s_charge(pdgCode);
  if (name.compare(0,4,"~HIP") == 0)
    {
      if ((name.compare(0,7,"~HIPbar") == 0))  {
    std::string str = name.substr(7); 
    charge=eplus*atoi(str.c_str())/3.;
      } else {
    std::string str = name.substr(4); 
    charge=eplus*atoi(str.c_str())*-1./3.;  
      }
    }
  if (name.compare(0,9,"anti_~HIP") == 0)
    {
      if ((name.compare(0,12,"anti_~HIPbar") == 0))  {
    std::string str = name.substr (12); 
    charge=eplus*atoi(str.c_str())*-1./3.;
      } else {
    std::string str = name.substr (9); 
    charge=eplus*atoi(str.c_str())*1./3.;  
      }
    }
  int spin =  (int)CustomPDGParser::s_spin(pdgCode)-1;
  int parity = +1;
  int conjugation = 0;
  int isospin = 0;
  int isospinZ = 0;
  int gParity = 0;
  int lepton = 0;  //FIXME:
  int baryon = 1;  //FIXME: 
  bool stable = true;
  double lifetime = -1;
 
  G4DecayTable *decaytable = nullptr;
  G4ParticleTable* theParticleTable = G4ParticleTable::GetParticleTable();

  CustomParticle *particle  = new CustomParticle(name, massGeV, width, charge, spin, 
                         parity, conjugation, isospin, isospinZ,
                         gParity, pType, lepton, baryon, pdgCode,
                         stable, lifetime, decaytable);
 
  if(pType == "rhadron" && name!="~g"){  
    G4String cloudname = name+"cloud";
    G4String cloudtype = pType+"cloud";
    spectator = theParticleTable->FindParticle(1000021);
    spectatormass = spectator->GetPDGMass();
    G4double cloudmass = mass-spectatormass/GeV;
    CustomParticle *tmpParticle  = new CustomParticle(
                              cloudname,           cloudmass * GeV ,        0.0*MeV,  0 , 
                              0,              +1,             0,          
                              0,              0,             0,             
                              cloudtype,               0,            +1, 0,
                              true,            -1.0,          NULL );
    particle->SetCloud(tmpParticle);
    particle->SetSpectator(spectator);
    
    edm::LogInfo("SimG4CoreCustomPhysics")
      <<"CustomParticleFactory: " <<name<<" being assigned "
      <<particle->GetCloud()->GetParticleName()
      <<" and "<<particle->GetSpectator()->GetParticleName() << "\n" 
      <<"                        Masses: "<<particle->GetPDGMass()/GeV<<" Gev, "
      <<particle->GetCloud()->GetPDGMass()/GeV<<" GeV and "
      <<particle->GetSpectator()->GetPDGMass()/GeV<<" GeV."; 
  } else if(pType == "mesonino" || pType == "sbaryon") {
    int sign=1;
    if(pdgCode < 0 ) sign=-1;

    G4String cloudname = name+"cloud";
    G4String cloudtype = pType+"cloud";
    if(CustomPDGParser::s_isstopHadron(pdgCode)) {
      spectator = theParticleTable->FindParticle(1000006*sign);
    }
    else { 
      if (CustomPDGParser::s_issbottomHadron(pdgCode)) {
    spectator = theParticleTable->FindParticle(1000005*sign);
      } else {
        spectator = nullptr;
        edm::LogError("SimG4CoreCustomPhysics")<< "CustomParticleFactory: Cannot find spectator parton";
      }
    }
    if(spectator) spectatormass = spectator->GetPDGMass();
    G4double cloudmass = mass-spectatormass/GeV;
    CustomParticle *tmpParticle  = new CustomParticle(
                                                      cloudname,           cloudmass * GeV ,        0.0*MeV,  0 ,
                                                      0,              +1,             0,
                                                      0,              0,             0,
                                                      cloudtype,               0,            +1, 0,
                                                      true,            -1.0,          NULL );
    particle->SetCloud(tmpParticle);
    particle->SetSpectator(spectator);

    edm::LogInfo("SimG4CoreCustomPhysics")
      <<"CustomParticleFactory: "<<name<<" being assigned "
      <<particle->GetCloud()->GetParticleName()
      <<" and "<<particle->GetSpectator()->GetParticleName() << "\n" 
      <<"                        Masses: "
      <<particle->GetPDGMass()/GeV<<" Gev, "
      <<particle->GetCloud()->GetPDGMass()/GeV<<" GeV and "
      <<particle->GetSpectator()->GetPDGMass()/GeV<<" GeV."; 
  }
  else{
    particle->SetCloud(0);
    particle->SetSpectator(0);
  } 
  m_particles.insert(particle);
}

void  CustomParticleFactory::getMassTable(std::ifstream *configFile) {

  int pdgId;
  double mass;
  std::string name, tmp;
  std::string line;
  // This should be compatible IMO to SLHA 
  while (getline(*configFile,line)) {
    line.erase(0, line.find_first_not_of(" \t"));         // remove leading whitespace
    if (line.length()==0 || line.at(0) == '#') continue;  // skip blank lines and comments
    if (ToLower(line).find("block") < line.npos) {
      edm::LogInfo("SimG4CoreCustomPhysics") 
    <<"CustomParticleFactory: Finished the Mass Table "; 
      break;
    }
    std::stringstream sstr(line);
    sstr >> pdgId >> mass >> tmp >> name;  // Assume SLHA format, e.g.: 1000001 5.68441109E+02 # ~d_L 

    edm::LogInfo("SimG4CoreCustomPhysics") 
      <<"CustomParticleFactory: Calling addCustomParticle for pdgId: " << pdgId 
      << ", mass " << mass << ", name " << name; 
    addCustomParticle(pdgId, fabs(mass), name);
    int pdgIdPartner = pdgId%100;
    G4ParticleTable* theParticleTable = G4ParticleTable::GetParticleTable();
    G4ParticleDefinition *aParticle = theParticleTable->FindParticle(pdgIdPartner);
    //Add antiparticles for SUSY particles only, not for rHadrons.
    edm::LogInfo("SimG4CoreCustomPhysics") 
      <<"CustomParticleFactory: Found aParticle = " << aParticle
      << ", pdgId = " << pdgId
      << ", pdgIdPartner = " << pdgIdPartner  
      << ", CustomPDGParser::s_isRHadron(pdgId) = " << CustomPDGParser::s_isRHadron(pdgId)    
      << ", CustomPDGParser::s_isstopHadron(pdgId) = " << CustomPDGParser::s_isstopHadron(pdgId); 
    
    if (aParticle && 
    !CustomPDGParser::s_isRHadron(pdgId)    && 
    !CustomPDGParser::s_isstopHadron(pdgId) && 
    pdgId!=1000006 && 
    pdgId!=-1000006  && 
    pdgId!=25 && 
    pdgId!=35 && 
    pdgId!=36 && 
    pdgId!=37){ 
      int sign = aParticle->GetAntiPDGEncoding()/pdgIdPartner;   
      edm::LogInfo("SimG4CoreCustomPhysics") 
    <<"CustomParticleFactory: Found sign = " << sign 
    << ", aParticle->GetAntiPDGEncoding() " << aParticle->GetAntiPDGEncoding() 
    << ", pdgIdPartner = " << pdgIdPartner;   
      if(abs(sign)!=1) {
    edm::LogInfo("SimG4CoreCustomPhysics")
      <<"CustomParticleFactory: sgn= "<<sign<<" a "
      <<aParticle->GetAntiPDGEncoding()<<" b "<<pdgIdPartner; 
    aParticle->DumpTable();
      }
      if(sign==-1 && pdgId!=25 && pdgId!=35 && pdgId!=36 && pdgId!=37 && pdgId!=1000039){
    tmp = "anti_"+name;
    edm::LogInfo("SimG4CoreCustomPhysics") 
      <<"CustomParticleFactory: Calling addCustomParticle for antiparticle with pdgId: " 
      << -pdgId << ", mass " << mass << ", name " << tmp; 
    addCustomParticle(-pdgId, mass, tmp);
    theParticleTable->FindParticle(pdgId)->SetAntiPDGEncoding(-pdgId);
      }
      else theParticleTable->FindParticle(pdgId)->SetAntiPDGEncoding(pdgId);      
    }
    
    if(pdgId==1000039) theParticleTable->FindParticle(pdgId)->SetAntiPDGEncoding(pdgId); // gravitino     
    if(pdgId==1000024 || pdgId==1000037 || pdgId==37) {   
      tmp = "anti_"+name;
      edm::LogInfo("SimG4CoreCustomPhysics") 
    <<"CustomParticleFactory: Calling addCustomParticle for antiparticle (2) with pdgId: " 
    << -pdgId << ", mass " << mass << ", name " << tmp; 
      addCustomParticle(-pdgId, mass, tmp);
      theParticleTable->FindParticle(pdgId)->SetAntiPDGEncoding(-pdgId);
    }
  }
}

G4DecayTable*  CustomParticleFactory::getDecayTable(std::ifstream *configFile, int pdgId) {

  double br;
  int nDaughters;
  std::vector<int> pdg(4);
  std::string line;
  std::vector<std::string> name(4);

  G4ParticleTable* theParticleTable = G4ParticleTable::GetParticleTable();

  std::string parentName = theParticleTable->FindParticle(pdgId)->GetParticleName();
  G4DecayTable *decaytable= new G4DecayTable();

  while(getline(*configFile,line)) {
    
    line.erase(0, line.find_first_not_of(" \t"));         // remove leading whitespace
    if (line.length()==0) continue;                       // skip blank lines 
    if (line.at(0) == '#' && 
    ToLower(line).find("br")  < line.npos &&
    ToLower(line).find("nda") < line.npos) continue;  // skip a comment of the form:  # BR  NDA  ID1  ID2
    if (line.at(0) == '#') {                              // other comments signal the end of the decay block  
      edm::LogInfo("SimG4CoreCustomPhysics") <<"CustomParticleFactory: Finished the Decay Table "; 
      break;
    }
    
    pdg.clear();
    name.clear();

    std::stringstream sstr(line);  
    sstr >> br >> nDaughters;  // assume SLHA format, e.g.:  1.49435135E-01  2  -15  16  # BR(H+ -> tau+ nu_tau)
    edm::LogInfo("SimG4CoreCustomPhysics") 
      <<"CustomParticleFactory: Branching Ratio: " << br << ", Number of Daughters: " << nDaughters; 
    if (nDaughters > 4) {
      edm::LogError("SimG4CoreCustomPhysics") 
    <<"CustomParticleFactory: Number of daughters is too large (max = 4): " << nDaughters 
    << " for pdgId: " << pdgId; 
      break; 
    }
    for(int i=0; i<nDaughters; i++) {
      sstr >> pdg[i];
      edm::LogInfo("SimG4CoreCustomPhysics") <<"CustomParticleFactory: Daughter ID " << pdg[i]; 
      const G4ParticleDefinition* part = theParticleTable->FindParticle(pdg[i]);
      if (!part) {
    edm::LogWarning("SimG4CoreCustomPhysics")
      <<"CustomParticleFactory: particle with PDG code"<<pdg[i] <<" not found!"; 
    continue;
      }
      name[i] = part->GetParticleName();
    }
    G4PhaseSpaceDecayChannel *aDecayChannel = new G4PhaseSpaceDecayChannel(parentName, br, nDaughters,
                                       name[0],name[1],name[2],name[3]);    
    decaytable->Insert(aDecayChannel);  
  }
  return decaytable;
}

G4DecayTable*  CustomParticleFactory::getAntiDecayTable(int pdgId,  G4DecayTable *theDecayTable) {

  std::vector<std::string> name(4);
  G4ParticleTable* theParticleTable = G4ParticleTable::GetParticleTable();

  std::string parentName = theParticleTable->FindParticle(-pdgId)->GetParticleName();
  G4DecayTable *decaytable= new G4DecayTable();

  for(int i=0;i<theDecayTable->entries();i++){
    G4VDecayChannel *theDecayChannel = theDecayTable->GetDecayChannel(i); 
    int nd = std::min(4, theDecayChannel->GetNumberOfDaughters());
    for(int j=0; j<nd; ++j){
      int id = theDecayChannel->GetDaughter(j)->GetAntiPDGEncoding();
      const G4ParticleDefinition* part = theParticleTable->FindParticle(id);
      if (!part) {
    edm::LogWarning("SimG4CoreCustomPhysics")
      <<"CustomParticleFactory: antiparticle with PDG code"<<id <<" not found!"; 
    continue;
      }
      name[i] = part->GetParticleName();
    }
    G4PhaseSpaceDecayChannel *aDecayChannel = 
      new G4PhaseSpaceDecayChannel(parentName, 
                   theDecayChannel->GetBR(), nd,
                   name[0],name[1],name[2],name[3]);  
    decaytable->Insert(aDecayChannel);
  }
  return decaytable;
}

std::string CustomParticleFactory::ToLower(std::string str) {
  std::locale loc;
  for (std::string::size_type i=0; i<str.length(); ++i)
    str.at(i) = std::tolower(str.at(i),loc);
  return str;   
}