Generator for trident production. More...

#include <PhotonRESGenerator.h>

Inheritance diagram for genie::PhotonRESGenerator:

Collaboration diagram for genie::PhotonRESGenerator:

Public Member Functions
	PhotonRESGenerator ()

	PhotonRESGenerator (string config)

	~PhotonRESGenerator ()

void	Initialize (void) const

void	ProcessEventRecord (GHepRecord *evrec) const

void	Configure (const Registry &config)

void	Configure (string config)

Public Member Functions inherited from genie::EventRecordVisitorI
virtual	~EventRecordVisitorI ()

Public Member Functions inherited from genie::Algorithm
virtual	~Algorithm ()

virtual void	FindConfig (void)

virtual const Registry &	GetConfig (void) const

Registry *	GetOwnedConfig (void)

virtual const AlgId &	Id (void) const
	Get algorithm ID. More...

virtual AlgStatus_t	GetStatus (void) const
	Get algorithm status. More...

virtual bool	AllowReconfig (void) const

virtual AlgCmp_t	Compare (const Algorithm *alg) const
	Compare with input algorithm. More...

virtual void	SetId (const AlgId &id)
	Set algorithm ID. More...

virtual void	SetId (string name, string config)

const Algorithm *	SubAlg (const RgKey &registry_key) const

void	AdoptConfig (void)

void	AdoptSubstructure (void)

virtual void	Print (ostream &stream) const
	Print algorithm info. More...

Private Member Functions
void	LoadConfig (void)

Private Attributes
TPythia6 *	fPythia
	PYTHIA6 wrapper class. More...

double	fQ2PDFmin

Born *	born

Additional Inherited Members
Static Public Member Functions inherited from genie::Algorithm
static string	BuildParamVectKey (const std::string &comm_name, unsigned int i)

static string	BuildParamVectSizeKey (const std::string &comm_name)

static string	BuildParamMatKey (const std::string &comm_name, unsigned int i, unsigned int j)

static string	BuildParamMatRowSizeKey (const std::string &comm_name)

static string	BuildParamMatColSizeKey (const std::string &comm_name)

Protected Member Functions inherited from genie::EventRecordVisitorI
	EventRecordVisitorI ()

	EventRecordVisitorI (string name)

	EventRecordVisitorI (string name, string config)

Protected Member Functions inherited from genie::Algorithm
	Algorithm ()

	Algorithm (string name)

	Algorithm (string name, string config)

void	Initialize (void)

void	DeleteConfig (void)

void	DeleteSubstructure (void)

Registry *	ExtractLocalConfig (const Registry &in) const

Registry *	ExtractLowerConfig (const Registry &in, const string &alg_key) const
	Split an incoming configuration Registry into a block valid for the sub-algo identified by alg_key. More...

template<class T >
bool	GetParam (const RgKey &name, T &p, bool is_top_call=true) const

template<class T >
bool	GetParamDef (const RgKey &name, T &p, const T &def) const

template<class T >
int	GetParamVect (const std::string &comm_name, std::vector< T > &v, bool is_top_call=true) const
	Handle to load vectors of parameters. More...

int	GetParamVectKeys (const std::string &comm_name, std::vector< RgKey > &k, bool is_top_call=true) const

template<class T >
int	GetParamMat (const std::string &comm_name, TMatrixT< T > &mat, bool is_top_call=true) const
	Handle to load matrix of parameters. More...

template<class T >
int	GetParamMatSym (const std::string &comm_name, TMatrixTSym< T > &mat, bool is_top_call=true) const

int	GetParamMatKeys (const std::string &comm_name, std::vector< RgKey > &k, bool is_top_call=true) const

int	AddTopRegistry (Registry *rp, bool owns=true)
	add registry with top priority, also update ownership More...

int	AddLowRegistry (Registry *rp, bool owns=true)
	add registry with lowest priority, also update ownership More...

int	MergeTopRegistry (const Registry &r)

int	AddTopRegisties (const vector< Registry * > &rs, bool owns=false)
	Add registries with top priority, also udated Ownerships. More...

Protected Attributes inherited from genie::Algorithm
bool	fAllowReconfig

bool	fOwnsSubstruc
	true if it owns its substructure (sub-algs,...) More...

AlgId	fID
	algorithm name and configuration set More...

vector< Registry * >	fConfVect

vector< bool >	fOwnerships
	ownership for every registry in fConfVect More...

AlgStatus_t	fStatus
	algorithm execution status More...

AlgMap *	fOwnedSubAlgMp
	local pool for owned sub-algs (taken out of the factory pool) More...

Detailed Description

Generator for trident production.

Author: Alfonso Garcia <aagarciasoto km3net.de> IFIC & Harvard University

Created:: Dec 8, 2021

License:: Copyright (c) 2003-2024, The GENIE Collaboration For the full text of the license visit http://copyright.genie-mc.org or see $GENIE/LICENSE

Definition at line 29 of file PhotonRESGenerator.h.

Constructor & Destructor Documentation

PhotonRESGenerator::PhotonRESGenerator ( )

Definition at line 42 of file PhotonRESGenerator.cxx.

References born, and Initialize().

                                        :
 EventRecordVisitorI("genie::PhotonRESGenerator")
 {
   this->Initialize();
   born = new Born();
 }

PhotonRESGenerator::PhotonRESGenerator ( string config )

Definition at line 49 of file PhotonRESGenerator.cxx.

References Initialize().

                                                     :
 EventRecordVisitorI("genie::PhotonRESGenerator", config)
 {
   this->Initialize();
 }

PhotonRESGenerator::~PhotonRESGenerator ( )

Definition at line 55 of file PhotonRESGenerator.cxx.

 {
 
 }

Member Function Documentation

void PhotonRESGenerator::Configure ( const Registry & config )

virtual

Configure the algorithm with an external registry The registry is merged with the top level registry if it is owned, Otherwise a copy of it is added with the highest priority

Reimplemented from genie::Algorithm.

Definition at line 257 of file PhotonRESGenerator.cxx.

References genie::Algorithm::Configure(), and LoadConfig().

 {
   Algorithm::Configure(config);
   this->LoadConfig();
 }

void PhotonRESGenerator::Configure ( string config )

virtual

Configure the algorithm from the AlgoConfigPool based on param_set string given in input An algorithm contains a vector of registries coming from different xml configuration files, which are loaded according a very precise prioriy This methods will load a number registries in order of priority: 1) "Tunable" parameter set from CommonParametes. This is loaded with the highest prioriry and it is designed to be used for tuning procedure Usage not expected from the user. 2) For every string defined in "CommonParame" the corresponding parameter set will be loaded from CommonParameter.xml 3) parameter set specified by the config string and defined in the xml file of the algorithm 4) if config is not "Default" also the Default parameter set from the same xml file will be loaded Effectively this avoids the repetion of a parameter when it is not changed in the requested configuration

Reimplemented from genie::Algorithm.

Definition at line 263 of file PhotonRESGenerator.cxx.

References genie::Algorithm::Configure(), and LoadConfig().

 {
   Algorithm::Configure(config);
   this->LoadConfig();
 }

void PhotonRESGenerator::Initialize ( void ) const

Definition at line 60 of file PhotonRESGenerator.cxx.

References fPythia, and genie::RandomGen::Instance().

Referenced by PhotonRESGenerator().

 {
   fPythia = TPythia6::Instance();
 
   // sync GENIE/PYTHIA6 seed number                                                                                                                                   
   RandomGen::Instance();
 }

void PhotonRESGenerator::LoadConfig ( void )

private

Definition at line 269 of file PhotonRESGenerator.cxx.

References fPythia, fQ2PDFmin, genie::Algorithm::GetParam(), and genie::constants::kMw.

Referenced by Configure().

 {
 
   // PYTHIA parameters only valid for HEDIS
   double wmin;        GetParam( "Xsec-Wmin",     wmin ) ;
   int warnings;       GetParam( "Warnings",      warnings ) ;
   int errors;         GetParam( "Errors",        errors ) ;
   int qrk_mass;       GetParam( "QuarkMass",     qrk_mass ) ;
   fPythia->SetPARP(2,  wmin);         //(D = 10. GeV) lowest c.m. energy for the event as a whole that the program will accept to simulate. (bellow 2GeV pythia crashes)
   fPythia->SetMSTU(26, warnings);     // (Default=10) maximum number of warnings that are printed
   fPythia->SetMSTU(22, errors);       // (Default=10) maximum number of errors that are printed
   fPythia->SetMSTJ(93, qrk_mass);     // light (d, u, s, c, b) quark masses are taken from PARF(101) - PARF(105) rather than PMAS(1,1) - PMAS(5,1). Diquark masses are given as sum of quark masses, without spin splitting term.
 
   fPythia->SetPMAS(24,1,kMw);  //mass of the W boson (pythia=80.450 // genie=80.385)
   fPythia->SetPMAS(24,2,0.);   //set to 0 the width of the W boson to avoid problems with energy conservation
   fPythia->SetPMAS(6,2,0.);    //set to 0 the width of the top to avoid problems with energy conservation
 
   GetParam( "Q2Grid-Min", fQ2PDFmin );
 
 }

void PhotonRESGenerator::ProcessEventRecord ( GHepRecord * evrec ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 68 of file PhotonRESGenerator.cxx.

References genie::GHepRecord::AddParticle(), genie::utils::math::LongLorentzVector::BoostZ(), born, genie::utils::math::LongLorentzVector::E(), genie::PDGLibrary::Find(), fPythia, fQ2PDFmin, genie::Interaction::FSPrimLepton(), genie::Interaction::FSPrimLeptonPdg(), genie::Kinematics::GetKV(), genie::Born::GetS(), genie::GHepRecord::HitNucleon(), genie::Target::HitNucMass(), genie::Interaction::InitState(), genie::RandomGen::Instance(), genie::PDGLibrary::Instance(), genie::pdg::IsAntiMuon(), genie::pdg::IsAntiNeutrino(), genie::pdg::IsAntiTau(), genie::pdg::IsElectron(), genie::pdg::IsMuon(), genie::pdg::IsNeutrino(), genie::pdg::IsPositron(), genie::pdg::IsTau(), genie::Interaction::Kine(), genie::Interaction::KinePtr(), genie::kIStDecayedState, genie::kIStDISPreFragmHadronicState, genie::kIStFinalStateNuclearRemnant, genie::kIStStableFinalState, genie::kKVn1, genie::kKVn2, genie::kPdgAntiNuE, genie::kPdgAntiNuMu, genie::kPdgAntiNuTau, genie::kPdgNuE, genie::kPdgNuMu, genie::kPdgNuTau, genie::kPdgWM, genie::kPdgWP, genie::constants::kPi, genie::kRfLab, LOG, genie::GHepParticle::P4(), genie::GHepParticle::Pdg(), genie::GHepRecord::Probe(), genie::InitialState::ProbeE(), genie::InitialState::ProbePdg(), pWARN, genie::utils::math::LongLorentzVector::Px(), genie::utils::math::LongLorentzVector::Py(), genie::utils::math::LongLorentzVector::Pz(), genie::units::s, genie::Kinematics::SetFSLeptonP4(), genie::GHepRecord::Summary(), genie::InitialState::Tgt(), and genie::GHepParticle::X4().

 {
 
   Interaction * interaction = evrec->Summary();
   const InitialState & init_state = interaction->InitState();
 
   //incoming v & struck particle & remnant nucleus
   GHepParticle * nu = evrec->Probe();
   GHepParticle * el = evrec->HitNucleon();
 
   GHepParticle * target = evrec -> TargetNucleus();
   if(target) evrec->AddParticle(target->Pdg(), kIStFinalStateNuclearRemnant, 1,-1,-1,-1, *(target->P4()), *(target->X4()) );
 
   TVector3 unit_nu = nu->P4()->Vect().Unit();
 
   int probepdg = init_state.ProbePdg();
 
   long double Mtarget = init_state.Tgt().HitNucMass();
   long double mlout = interaction->FSPrimLepton()->Mass(); //mass of charged lepton
   
   long double Enuin = init_state.ProbeE(kRfLab); 
   long double s = born->GetS(Mtarget,Enuin);
 
   long double n1 = interaction->Kine().GetKV(kKVn1);
   long double n2 = interaction->Kine().GetKV(kKVn2);
 
   long double costhCM = n1;
   long double sinthCM = sqrtl(1-costhCM*costhCM);
   
   long double xmin = fQ2PDFmin/2./Enuin/Mtarget;
   long double x = expl( logl(xmin) + (logl(1.0)-logl(xmin))*n2 );
   long double s_r = s*x;
 
   // Boost velocity CM -> LAB
   long double EnuinCM = sqrtl(s_r)/2.;
   long double beta = (powl(Enuin,2)-powl(EnuinCM,2))/(powl(Enuin,2)+powl(EnuinCM,2));
 
   // Final state primary lepton PDG code
   int pdgl = interaction->FSPrimLeptonPdg();
   assert(pdgl!=0);
 
   if ( pdg::IsElectron(TMath::Abs(pdgl)) || pdg::IsMuon(TMath::Abs(pdgl)) || pdg::IsTau(TMath::Abs(pdgl)) ) {
 
     long double ElpoutCM = (s_r+mlout*mlout)/sqrtl(s_r)/2.;
     long double EnuoutCM = (s_r-mlout*mlout)/sqrtl(s_r)/2.;
     LongLorentzVector p4_lpout( 0.,  EnuoutCM*sinthCM,  EnuoutCM*costhCM, ElpoutCM );
     LongLorentzVector p4_nuout( 0., -EnuoutCM*sinthCM, -EnuoutCM*costhCM, EnuoutCM );
 
     p4_lpout.BoostZ(beta);
     p4_nuout.BoostZ(beta);
 
     TLorentzVector p4lp_o( (double)p4_lpout.Px(), (double)p4_lpout.Py(), (double)p4_lpout.Pz(), (double)p4_lpout.E() );
     TLorentzVector p4nu_o( (double)p4_nuout.Px(), (double)p4_nuout.Py(), (double)p4_nuout.Pz(), (double)p4_nuout.E() );
 
     // Randomize transverse components
     RandomGen * rnd = RandomGen::Instance();
     double phi  = 2* kPi * rnd->RndLep().Rndm();
     p4lp_o.RotateZ(phi);
     p4nu_o.RotateZ(phi);
 
     //rotate from LAB=[0,0,Ev,Ev]->[px,py,pz,E]
     p4lp_o.RotateUz(unit_nu);
     p4nu_o.RotateUz(unit_nu);
 
     int pdgvout = 0;
     if      ( pdg::IsElectron(pdgl) ) pdgvout = kPdgAntiNuE;
     else if ( pdg::IsPositron(pdgl) ) pdgvout = kPdgNuE;
     else if ( pdg::IsMuon(pdgl)     ) pdgvout = kPdgAntiNuMu;
     else if ( pdg::IsAntiMuon(pdgl) ) pdgvout = kPdgNuMu;
     else if ( pdg::IsTau(pdgl)      ) pdgvout = kPdgAntiNuTau;
     else if ( pdg::IsAntiTau(pdgl)  ) pdgvout = kPdgNuTau;
 
     int pdgboson = pdg::IsNeutrino(probepdg) ? kPdgWP : kPdgWM;
 
     // Create a GHepParticle and add it to the event record
     evrec->AddParticle( pdgboson, kIStDecayedState,     0, -1,  5,  6, *nu->P4()+*el->P4(), *(nu->X4()) ); //W [mothers: nuebar_in,e_in][daugthers: nulbar_out,lp_out]
     evrec->AddParticle( pdgl,     kIStStableFinalState, 4, -1, -1, -1, p4lp_o,              *(nu->X4()) );
     evrec->AddParticle( pdgvout,  kIStStableFinalState, 4, -1, -1, -1, p4nu_o,              *(nu->X4()) );
     evrec->Summary()->KinePtr()->SetFSLeptonP4(p4lp_o);
 
   }
   else {
 
     char p6frame[10];
     strcpy(p6frame, "CMS"    );
 
     char p6nu[10], p6tgt[10];
     if      (pdg::IsAntiNeutrino(nu->Pdg())) { strcpy(p6nu, "nu_ebar");   strcpy(p6tgt, "e-");   }
     else if (pdg::IsNeutrino    (nu->Pdg())) { strcpy(p6nu, "nu_e");      strcpy(p6tgt, "e+");   }
 
     int def61  = fPythia->GetMSTP(61);  
     int def71  = fPythia->GetMSTP(71); 
     int def206 = fPythia->GetMDME(206,1);
     int def207 = fPythia->GetMDME(207,1);
     int def208 = fPythia->GetMDME(208,1); 
     fPythia->SetMSTP(61,0);    // (Default=2) master switch for initial-state QCD and QED radiation.
     fPythia->SetMSTP(71,0);    // (Default=2) master switch for initial-state QCD and QED radiation.
     fPythia->SetMDME(206,1,0); //swicht off W decay leptonic modes
     fPythia->SetMDME(207,1,0); 
     fPythia->SetMDME(208,1,0); 
 
     fPythia->Pyinit(p6frame, p6nu, p6tgt, sqrtl(s_r));
     fPythia->Pyevnt();
 
     fPythia->SetMSTP(61,def61);
     fPythia->SetMSTP(71,def71);
     fPythia->SetMDME(206,1,def206);
     fPythia->SetMDME(207,1,def207); 
     fPythia->SetMDME(208,1,def208); 
 
     // get LUJETS record
     fPythia->GetPrimaries();
     TClonesArray * pythia_particles = (TClonesArray *) fPythia->ImportParticles("All");
     int np = pythia_particles->GetEntries();
     assert(np>0);
 
     TMCParticle * particle = 0;
     TIter piter(pythia_particles);
     while( (particle = (TMCParticle *) piter.Next()) ) {
       
       int pdgc = particle->GetKF();
       int ks = particle->GetKS();
 
       if ( ks==21 ) { continue; } //we dont want to save first particles from pythia (init states)
 
       LongLorentzVector p4longo(particle->GetPx(), particle->GetPy(), particle->GetPz(), particle->GetEnergy());
       p4longo.BoostZ(beta); 
 
       TLorentzVector p4o( (double)p4longo.Px(), (double)p4longo.Py(), (double)p4longo.Pz(), (double)p4longo.E() );
       p4o.RotateUz(unit_nu); 
      
       TParticlePDG * part = PDGLibrary::Instance()->Find(pdgc);
       if ( (ks==1 || ks==4) && p4o.E() < part->Mass() ) {
         LOG("PhotonRESGenerator", pWARN) << "Putting at rest one stable particle generated by PYTHIA because E < m";
         LOG("PhotonRESGenerator", pWARN) << "PDG = " << pdgc << " // State = " << ks;
         LOG("PhotonRESGenerator", pWARN) << "E = " << p4o.E() << " // |p| = " << TMath::Sqrt(p4o.P()); 
         LOG("PhotonRESGenerator", pWARN) << "p = [ " << p4o.Px() << " , "  << p4o.Py() << " , "  << p4o.Pz() << " ]";
         LOG("PhotonRESGenerator", pWARN) << "m    = " << p4o.M() << " // mpdg = " << part->Mass();
         p4o.SetXYZT(0,0,0,part->Mass());
       }
 
       // copy final state particles to the event record
       GHepStatus_t ist = (ks==1 || ks==4) ? kIStStableFinalState : kIStDISPreFragmHadronicState;
 
       // fix numbering scheme used for mother/daughter assignments
       int firstmother = -1;
       int lastmother  = -1;
       int firstchild  = -1;
       int lastchild   = -1;
 
       if ( particle->GetParent() < 10 ) {
         if      ( TMath::Abs(pdgc)<7 ) {   //outgoing quarks: mother will be the boson (saved in position 4)
           firstmother = 4;       
           firstchild  = particle->GetFirstChild() - 6;
           lastchild   = particle->GetLastChild()  - 6;
         }
         else if ( TMath::Abs(pdgc)==24 ) { //produced W boson: mother will be the incoming neutrino
           firstmother = 0;
           firstchild  = particle->GetFirstChild() - 6;
           lastchild   = particle->GetLastChild()  - 6;
         }
         else if ( pdgc==22 ) {             //radiative photons: mother will be the incoming electron
           firstmother = 2; 
         }
       }
       else { //rest
         firstmother = particle->GetParent()     - 6; //shift to match boson position
         firstchild  = (particle->GetFirstChild()==0) ? particle->GetFirstChild() - 1 : particle->GetFirstChild() - 6;
         lastchild   = (particle->GetLastChild()==0)  ? particle->GetLastChild()  - 1 : particle->GetLastChild()  - 6;
       }
 
       double lightspeed = 299792458e3; //c in mm/s. Used for time in PYTHIA t[s]=t_pythia[mm]/c[mm/s]
       double vx = nu->X4()->X() + particle->GetVx()*1e12; //pythia gives position in [mm] while genie uses [fm]
       double vy = nu->X4()->Y() + particle->GetVy()*1e12;
       double vz = nu->X4()->Z() + particle->GetVz()*1e12;
       double vt = nu->X4()->T() + particle->GetTime()/lightspeed;
       TLorentzVector pos( vx, vy, vz, vt );
 
       evrec->AddParticle(pdgc, ist, firstmother, lastmother, firstchild, lastchild, p4o, pos );
 
     }
   
     delete particle;
     pythia_particles->Clear("C");
 
   }
 
 }