genie::PhotonCOHWdecPythia8 Class Reference

PhotonCOH W decay with pythia8. More...

#include <PhotonCOHWdecPythia8.h>

Inheritance diagram for genie::PhotonCOHWdecPythia8:

Collaboration diagram for genie::PhotonCOHWdecPythia8:

Public Member Functions
	PhotonCOHWdecPythia8 ()
	PhotonCOHWdecPythia8 (string config)
	~PhotonCOHWdecPythia8 ()
void	ProcessEventRecord (GHepRecord *event) 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.
virtual AlgStatus_t	GetStatus (void) const
	Get algorithm status.
virtual bool	AllowReconfig (void) const
virtual AlgCmp_t	Compare (const Algorithm *alg) const
	Compare with input algorithm.
virtual void	SetId (const AlgId &id)
	Set algorithm ID.
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.

Private Member Functions
bool	Wdecay (GHepRecord *event) const
void	Initialize (void) const
void	LoadConfig (void)

Private Attributes
double	fSSBarSuppression
	ssbar suppression
double	fGaussianPt2
	gaussian pt2 distribution width
double	fNonGaussianPt2Tail
	non gaussian pt2 tail parameterization
double	fRemainingECutoff
	remaining E cutoff stopping fragmentation
double	fDiQuarkSuppression
	di-quark suppression parameter
double	fLightVMesonSuppression
	light vector meson suppression
double	fSVMesonSuppression
	strange vector meson suppression
double	fLunda
	Lund a parameter.
double	fLundb
	Lund b parameter.
double	fLundaDiq
	adjustment of Lund a for di-quark

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.
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.
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.
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
int	AddLowRegistry (Registry *rp, bool owns=true)
	add registry with lowest priority, also update ownership
int	MergeTopRegistry (const Registry &r)
int	AddTopRegisties (const vector< Registry * > &rs, bool owns=false)
	Add registries with top priority, also udated Ownerships.
Protected Attributes inherited from genie::Algorithm
bool	fAllowReconfig
bool	fOwnsSubstruc
	true if it owns its substructure (sub-algs,...)
AlgId	fID
	algorithm name and configuration set
vector< Registry * >	fConfVect
vector< bool >	fOwnerships
	ownership for every registry in fConfVect
AlgStatus_t	fStatus
	algorithm execution status
AlgMap *	fOwnedSubAlgMp
	local pool for owned sub-algs (taken out of the factory pool)

Detailed Description

PhotonCOH W decay with pythia8.

Author

Alfonso Garcia <aagarciasoto \at km3net.de> IFIC (Valencia)

Created:\n Dec 12, 2024

License:\n Copyright (c) 2003-2025, The GENIE Collaboration

For the full text of the license visit http://copyright.genie-mc.org or see $GENIE/LICENSE

Definition at line 44 of file PhotonCOHWdecPythia8.h.

Constructor & Destructor Documentation

PhotonCOHWdecPythia8() [1/2]

PhotonCOHWdecPythia8::PhotonCOHWdecPythia8

(

)

Definition at line 14 of file PhotonCOHWdecPythia8.cxx.

                                           :
EventRecordVisitorI("genie::PhotonCOHWdecPythia8")
{
  this->Initialize();
}

References genie::EventRecordVisitorI::EventRecordVisitorI(), and Initialize().

PhotonCOHWdecPythia8() [2/2]

PhotonCOHWdecPythia8::PhotonCOHWdecPythia8

(

string

config

)

Definition at line 20 of file PhotonCOHWdecPythia8.cxx.

                                                        :
EventRecordVisitorI("genie::PhotonCOHWdecPythia8", config)
{
  this->Initialize();
}

References genie::EventRecordVisitorI::EventRecordVisitorI(), and Initialize().

~PhotonCOHWdecPythia8()

PhotonCOHWdecPythia8::~PhotonCOHWdecPythia8

(

)

Definition at line 26 of file PhotonCOHWdecPythia8.cxx.

{
 
}

Member Function Documentation

Configure() [1/2]

void PhotonCOHWdecPythia8::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 203 of file PhotonCOHWdecPythia8.cxx.

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

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

Configure() [2/2]

void PhotonCOHWdecPythia8::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 209 of file PhotonCOHWdecPythia8.cxx.

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

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

Initialize()

void PhotonCOHWdecPythia8::Initialize ( void ) const

private

Definition at line 250 of file PhotonCOHWdecPythia8.cxx.

{
 
#ifdef __GENIE_PYTHIA8_ENABLED__
  fPythia = Pythia8Singleton::Instance()->Pythia8();
 
  fPythia->readString("Print:quiet = on");
 
  // sync GENIE and PYTHIA8 seeds
  RandomGen * rnd = RandomGen::Instance();
  long int seed = rnd->GetSeed();
  fPythia->readString("Random:setSeed = on");
  fPythia->settings.mode("Random:seed", seed);
  LOG("LeptoHad", pINFO) << "PYTHIA8  seed = " << fPythia->settings.mode("Random:seed");
 
  //needed to only do hadronization
  fPythia->readString("ProcessLevel:all = off");
#endif
 
}

References genie::RandomGen::GetSeed(), genie::Pythia8Singleton::Instance(), genie::RandomGen::Instance(), LOG, and pINFO.

Referenced by PhotonCOHWdecPythia8(), and PhotonCOHWdecPythia8().

LoadConfig()

void PhotonCOHWdecPythia8::LoadConfig ( void )

private

Definition at line 215 of file PhotonCOHWdecPythia8.cxx.

{
 
#ifdef __GENIE_PYTHIA8_ENABLED__
  GetParam( "SSBarSuppression",       fSSBarSuppression       );
  GetParam( "GaussianPt2",            fGaussianPt2            );
  GetParam( "NonGaussianPt2Tail",     fNonGaussianPt2Tail     );
  GetParam( "RemainingEnergyCutoff",  fRemainingECutoff       );
  GetParam( "DiQuarkSuppression",     fDiQuarkSuppression     );
  GetParam( "LightVMesonSuppression", fLightVMesonSuppression );
  GetParam( "SVMesonSuppression",     fSVMesonSuppression     );
  GetParam( "Lunda",                  fLunda                  );
  GetParam( "Lundb",                  fLundb                  );
  GetParam( "LundaDiq",               fLundaDiq               );
 
  fPythia->settings.parm("StringFlav:probStoUD",         fSSBarSuppression);
  fPythia->settings.parm("Diffraction:primKTwidth",      fGaussianPt2);
  fPythia->settings.parm("StringPT:enhancedFraction",    fNonGaussianPt2Tail);
  fPythia->settings.parm("StringFragmentation:stopMass", fRemainingECutoff);
  fPythia->settings.parm("StringFlav:probQQtoQ",         fDiQuarkSuppression);
  fPythia->settings.parm("StringFlav:mesonUDvector",     fLightVMesonSuppression);
  fPythia->settings.parm("StringFlav:mesonSvector",      fSVMesonSuppression);
  fPythia->settings.parm("StringZ:aLund",                fLunda);
  fPythia->settings.parm("StringZ:bLund",                fLundb);
  fPythia->settings.parm("StringZ:aExtraDiquark",        fLundaDiq);
 
  // Same default mass of the W boson in pythia8 and genie, so no need to change in pythia8
  // No problem with energy conservation W and top decays, so no need to set the width to 0
 
  LOG("PhotonCOHGenerator", pINFO) << "Initialising PYTHIA..." ;
  fPythia->init(); 
#endif
 
}

References fDiQuarkSuppression, fGaussianPt2, fLightVMesonSuppression, fLunda, fLundaDiq, fLundb, fNonGaussianPt2Tail, fRemainingECutoff, fSSBarSuppression, fSVMesonSuppression, genie::Algorithm::GetParam(), LOG, and pINFO.

Referenced by Configure(), and Configure().

ProcessEventRecord()

void PhotonCOHWdecPythia8::ProcessEventRecord ( GHepRecord * event ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 31 of file PhotonCOHWdecPythia8.cxx.

{
 
  if(!this->Wdecay(event)) {
    LOG("PhotonCOHGenerator", pWARN) << "W decayer failed!";
    event->EventFlags()->SetBitNumber(kHadroSysGenErr, true);
    genie::exceptions::EVGThreadException exception;
    exception.SetReason("Could not simulate the W decay system");
    exception.SwitchOnFastForward();
    throw exception;
    return;
  }
 
}

References genie::kHadroSysGenErr, LOG, pWARN, genie::exceptions::EVGThreadException::SetReason(), genie::exceptions::EVGThreadException::SwitchOnFastForward(), and Wdecay().

Wdecay()

bool PhotonCOHWdecPythia8::Wdecay ( GHepRecord * event ) const

private

Definition at line 46 of file PhotonCOHWdecPythia8.cxx.

{
 
#ifdef __GENIE_PYTHIA8_ENABLED__
  Interaction * interaction = event->Summary();
  const InitialState & init_state = interaction->InitState();
 
  //incoming v & struck particle & remnant nucleus
  GHepParticle * nu = event->Probe();
 
  GHepParticle * target = event -> TargetNucleus();
  if(target) event->AddParticle(target->Pdg(), kIStFinalStateNuclearRemnant, 1,-1,-1,-1, *(target->P4()), *(target->X4()) );
 
  TVector3 unit_nu = nu->P4()->Vect().Unit();
 
  long double Ev = init_state.ProbeE(kRfLab);
 
  long double Mtgt = init_state.Tgt().Z()*kProtonMass + init_state.Tgt().N()*kNeutronMass;
 
  long double n1 = interaction->Kine().GetKV(kKVn1);
  long double n2 = interaction->Kine().GetKV(kKVn2);
  long double n3 = interaction->Kine().GetKV(kKVn3);
 
  long double costh = n1;
  long double sinth = sqrtl(1-costh*costh);
 
  long double mlout = 0;
  if      (pdg::IsNuE  (TMath::Abs(nu->Pdg()))) mlout = kElectronMass;
  else if (pdg::IsNuMu (TMath::Abs(nu->Pdg()))) mlout = kMuonMass;
  else if (pdg::IsNuTau(TMath::Abs(nu->Pdg()))) mlout = kTauMass;
  long double mlout2 = mlout*mlout;
 
  long double mL      = mlout+kMw;
  long double Delta   = sqrtl( powl(2.*Ev*Mtgt-mL*mL,2)-4.*powl(Mtgt*mL,2) );
  long double s12_min = Ev/(2.*Ev+Mtgt)*(mL*mL+2.*Ev*Mtgt-Delta);
  long double s12_max = Ev/(2.*Ev+Mtgt)*(mL*mL+2.*Ev*Mtgt+Delta);
  long double s12     = expl( logl(s12_min)+(logl(s12_max)-logl(s12_min))*n2);
  long double Q2_min  = powl(s12,2)*Mtgt/(2.*Ev*(2.*Ev*Mtgt-s12));
  long double Q2_max  = s12 - mL*mL;
  double Q2  = expl( logl(Q2_min) + (logl(Q2_max)-logl(Q2_min))*n3 );
  double s_r = s12 - Q2;
 
  long double EW = (s_r+kMw2-mlout2)/sqrtl(s_r)/2.;
  long double El = (s_r-kMw2+mlout2)/sqrtl(s_r)/2.;
  long double p  = sqrtl( EW*EW - kMw2 );
  LongLorentzVector p4_lout( 0., -p*sinth, -p*costh, El );
 
  long double bz = 4.*Ev*Mtgt*Q2/(Q2+s_r)/(2.*Ev*Mtgt-Q2) - (2.*Ev*Mtgt+Q2)/(2.*Ev*Mtgt-Q2);
  long double by = sqrtl(Mtgt*powl(Q2+s_r,2)/(2.*Ev*Q2*(s_r+Q2-2.*Ev*Mtgt))+1.);
 
  p4_lout.BoostZ(-bz);
  p4_lout.BoostY(-by);
 
  TLorentzVector p4l_o(p4_lout.Px(),p4_lout.Py(),p4_lout.Pz(),p4_lout.E());
  p4l_o.RotateX((double)acosl(by)-kPi/2.);
 
 
  // Randomize transverse components
  RandomGen * rnd = RandomGen::Instance();
  double phi  = 2 * kPi * rnd->RndLep().Rndm();
 
  p4l_o.RotateZ(phi);
 
  //rotate from LAB=[0,0,Ev,Ev]->[px,py,pz,E]
  p4l_o.RotateUz(unit_nu);
 
  int pdglout = 0;
  if      (pdg::IsAntiNuE  (nu->Pdg())) pdglout = kPdgPositron;
  else if (pdg::IsNuE      (nu->Pdg())) pdglout = kPdgElectron;
  else if (pdg::IsAntiNuMu (nu->Pdg())) pdglout = kPdgAntiMuon;
  else if (pdg::IsNuMu     (nu->Pdg())) pdglout = kPdgMuon;
  else if (pdg::IsAntiNuTau(nu->Pdg())) pdglout = kPdgAntiTau;
  else if (pdg::IsNuTau    (nu->Pdg())) pdglout = kPdgTau;
 
  // Create a GHepParticle and add it to the event record
  event->AddParticle( pdglout,  kIStStableFinalState, 0, -1, -1, -1, p4l_o, *(nu->X4()) );
 
  int pdgboson = pdg::IsNeutrino(init_state.ProbePdg()) ? kPdgWP : kPdgWM;
 
  fPythia->event.reset();
  fPythia->event.append(pdgboson, 23, 0, 0, 0., p*sinth, p*costh, EW, kMw);
 
  fPythia->next();
 
  // fPythia->event.list();
  // fPythia->stat();
 
  Pythia8::Event &fEvent = fPythia->event;
  int np = fEvent.size();
  assert(np>0);
 
  for (int i = 1; i < np; i++) {
 
    int pdgc = fEvent[i].id();
    if (!PDGLibrary::Instance()->Find(pdgc)) continue; // some intermediate particles not part of genie tables
 
    int ks = fEvent[i].status();
 
    LongLorentzVector p4longo(fEvent[i].px(), fEvent[i].py(), fEvent[i].pz(), fEvent[i].e());
    p4longo.BoostZ(-bz);
    p4longo.BoostY(-by);
 
    TLorentzVector p4o(p4longo.Px(),p4longo.Py(),p4longo.Pz(),p4longo.E());
    p4o.RotateX((double)acosl(by)-kPi/2.);
    p4o.RotateZ(phi);
    p4o.RotateUz(unit_nu);
 
    double massPDG = PDGLibrary::Instance()->Find(pdgc)->Mass();
    if ( ks>0 && p4o.E()<massPDG ) {
      LOG("PhotonCOHGenerator", pWARN) << "Putting at rest one stable particle generated by PYTHIA because E < m";
      LOG("PhotonCOHGenerator", pWARN) << "PDG = " << pdgc << " // State = " << ks;
      LOG("PhotonCOHGenerator", pWARN) << "E = " << p4o.E() << " // |p| = " << TMath::Sqrt(p4o.P());
      LOG("PhotonCOHGenerator", pWARN) << "p = [ " << p4o.Px() << " , "  << p4o.Py() << " , "  << p4o.Pz() << " ]";
      LOG("PhotonCOHGenerator", pWARN) << "m    = " << p4o.M() << " // mpdg = " << massPDG;
      p4o.SetXYZT(0,0,0,massPDG);
    }
 
    // copy final state particles to the event record
    GHepStatus_t ist = (ks>0) ? kIStStableFinalState : kIStDISPreFragmHadronicState;
 
    // fix numbering scheme used for mother/daughter assignments
    int firstmother = -1;
    int lastmother  = -1;
    int firstchild  = -1;
    int lastchild   = -1;
 
    if (fEvent[i].mother1()==0) {
      firstmother = 0;
    }
    else {
      firstmother = fEvent[i].mother1() + 3;
      if (fEvent[i].daughter1()!=0) firstchild  = fEvent[i].daughter1() + 3;
      if (fEvent[i].daughter2()!=0) lastchild   = fEvent[i].daughter2() + 3;
 
    }
 
    double vx = nu->X4()->X() + fEvent[i].xProd()*1e12; //pythia gives position in [mm] while genie uses [fm]
    double vy = nu->X4()->Y() + fEvent[i].yProd()*1e12;
    double vz = nu->X4()->Z() + fEvent[i].zProd()*1e12;
    double vt = nu->X4()->T() + fEvent[i].tProd()*(units::millimeter/units::second);
    TLorentzVector pos( vx, vy, vz, vt );
 
    event->AddParticle(pdgc, ist, firstmother, lastmother, firstchild, lastchild, p4o, pos );
 
  }
 
  return true;
#else
  return false;
#endif
 
}

References genie::utils::math::LongLorentzVector::BoostY(), genie::utils::math::LongLorentzVector::BoostZ(), genie::utils::math::LongLorentzVector::E(), e, genie::PDGLibrary::Find(), genie::Kinematics::GetKV(), genie::Interaction::InitState(), genie::PDGLibrary::Instance(), genie::RandomGen::Instance(), genie::pdg::IsAntiNuE(), genie::pdg::IsAntiNuMu(), genie::pdg::IsAntiNuTau(), genie::pdg::IsNeutrino(), genie::pdg::IsNuE(), genie::pdg::IsNuMu(), genie::pdg::IsNuTau(), genie::constants::kElectronMass, genie::Interaction::Kine(), genie::kIStDISPreFragmHadronicState, genie::kIStFinalStateNuclearRemnant, genie::kIStStableFinalState, genie::kKVn1, genie::kKVn2, genie::kKVn3, genie::constants::kMuonMass, genie::constants::kMw, genie::constants::kMw2, genie::constants::kNeutronMass, genie::kPdgAntiMuon, genie::kPdgAntiTau, genie::kPdgElectron, genie::kPdgMuon, genie::kPdgPositron, genie::kPdgTau, genie::kPdgWM, genie::kPdgWP, genie::constants::kPi, genie::constants::kProtonMass, genie::kRfLab, genie::constants::kTauMass, LOG, genie::units::millimeter, genie::Target::N(), genie::GHepParticle::P4(), genie::GHepParticle::Pdg(), genie::InitialState::ProbeE(), genie::InitialState::ProbePdg(), pWARN, genie::utils::math::LongLorentzVector::Px(), genie::utils::math::LongLorentzVector::Py(), genie::utils::math::LongLorentzVector::Pz(), genie::RandomGen::RndLep(), genie::units::second, genie::InitialState::Tgt(), genie::GHepParticle::X4(), and genie::Target::Z().

Referenced by ProcessEventRecord().

Member Data Documentation

fDiQuarkSuppression

double genie::PhotonCOHWdecPythia8::fDiQuarkSuppression

private

di-quark suppression parameter

Definition at line 71 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fGaussianPt2

double genie::PhotonCOHWdecPythia8::fGaussianPt2

private

gaussian pt2 distribution width

Definition at line 68 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fLightVMesonSuppression

double genie::PhotonCOHWdecPythia8::fLightVMesonSuppression

private

light vector meson suppression

Definition at line 72 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fLunda

double genie::PhotonCOHWdecPythia8::fLunda

private

Lund a parameter.

Definition at line 74 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fLundaDiq

double genie::PhotonCOHWdecPythia8::fLundaDiq

private

adjustment of Lund a for di-quark

Definition at line 76 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fLundb

double genie::PhotonCOHWdecPythia8::fLundb

private

Lund b parameter.

Definition at line 75 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fNonGaussianPt2Tail

double genie::PhotonCOHWdecPythia8::fNonGaussianPt2Tail

private

non gaussian pt2 tail parameterization

Definition at line 69 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fRemainingECutoff

double genie::PhotonCOHWdecPythia8::fRemainingECutoff

private

remaining E cutoff stopping fragmentation

Definition at line 70 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fSSBarSuppression

double genie::PhotonCOHWdecPythia8::fSSBarSuppression

private

ssbar suppression

Definition at line 67 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

fSVMesonSuppression

double genie::PhotonCOHWdecPythia8::fSVMesonSuppression

private

strange vector meson suppression

Definition at line 73 of file PhotonCOHWdecPythia8.h.

Referenced by LoadConfig().

---

The documentation for this class was generated from the following files:

• PhotonCOHWdecPythia8.h
• PhotonCOHWdecPythia8.cxx