genie::AMNuGammaGenerator Class Reference

#include <AMNuGammaGenerator.h>

Inheritance diagram for genie::AMNuGammaGenerator:

Collaboration diagram for genie::AMNuGammaGenerator:

Public Member Functions
	AMNuGammaGenerator ()
	AMNuGammaGenerator (string config)
	~AMNuGammaGenerator ()
void	ProcessEventRecord (GHepRecord *event_rec) const
Public Member Functions inherited from genie::EventRecordVisitorI
virtual	~EventRecordVisitorI ()
Public Member Functions inherited from genie::Algorithm
virtual	~Algorithm ()
virtual void	Configure (const Registry &config)
virtual void	Configure (string config)
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
void	AddPhoton (GHepRecord *event_rec) const
void	AddFinalStateNeutrino (GHepRecord *event_rec) const
void	AddTargetRemnant (GHepRecord *event_rec) const
void	AddRecoilNucleon (GHepRecord *event_rec) const

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

Author

Costas Andreopoulos <c.andreopoulos \at cern.ch> University of Liverpool

Created:\n Feb 15, 2008

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

For the full text of the license visit http://copyright.genie-mc.org

Definition at line 25 of file AMNuGammaGenerator.h.

Constructor & Destructor Documentation

AMNuGammaGenerator() [1/2]

AMNuGammaGenerator::AMNuGammaGenerator

(

)

Definition at line 28 of file AMNuGammaGenerator.cxx.

                                       :
EventRecordVisitorI("genie::AMNuGammaGenerator")
{
 
}

References genie::EventRecordVisitorI::EventRecordVisitorI().

AMNuGammaGenerator() [2/2]

AMNuGammaGenerator::AMNuGammaGenerator

(

string

config

)

Definition at line 34 of file AMNuGammaGenerator.cxx.

                                                    :
EventRecordVisitorI("genie::AMNuGammaGenerator", config)
{
 
}

References genie::EventRecordVisitorI::EventRecordVisitorI().

~AMNuGammaGenerator()

AMNuGammaGenerator::~AMNuGammaGenerator

(

)

Definition at line 40 of file AMNuGammaGenerator.cxx.

{
 
}

Member Function Documentation

AddFinalStateNeutrino()

void AMNuGammaGenerator::AddFinalStateNeutrino ( GHepRecord * event_rec ) const

private

Definition at line 112 of file AMNuGammaGenerator.cxx.

{
// Adding the final state neutrino
// Just use 4-momentum conservation (init_neutrino = photon + final_neutrino)
 
  LOG("AMNuGammaGenerator", pINFO) << "Adding final state neutrino";
 
  GHepParticle * nu    = evrec->Probe();                       // incoming v
  GHepParticle * gamma = evrec->Particle(nu->FirstDaughter()); // gamma
  assert(nu);
  assert(gamma);
 
  const TLorentzVector & vtx = *(nu->X4()); // vtx
 
  const TLorentzVector & p4nu_lab    = *(nu->P4());
  const TLorentzVector & p4gamma_lab = *(gamma->P4());
  TLorentzVector p4_lab = p4nu_lab - p4gamma_lab;
 
  GHepParticle p(nu->Pdg(), kIStStableFinalState, 0,-1,-1,-1, p4_lab, vtx);
  evrec->AddParticle(p);
}

References genie::GHepRecord::AddParticle(), genie::GHepParticle::FirstDaughter(), genie::kIStStableFinalState, LOG, genie::GHepParticle::P4(), genie::GHepRecord::Particle(), genie::GHepParticle::Pdg(), pINFO, genie::GHepRecord::Probe(), and genie::GHepParticle::X4().

Referenced by ProcessEventRecord().

AddPhoton()

void AMNuGammaGenerator::AddPhoton ( GHepRecord * event_rec ) const

private

Definition at line 53 of file AMNuGammaGenerator.cxx.

{
// Adding the final state photon
//
  LOG("AMNuGammaGenerator", pINFO) << "Adding final state photon";
 
  RandomGen * rnd = RandomGen::Instance();
 
  // Get boost vector for transforms between LAB <-> NRF (nucleon rest frame)
  GHepParticle * nuc = evrec->HitNucleon();
  const TLorentzVector & p4nuc_lab = *(nuc->P4());
  TVector3 beta = p4nuc_lab.BoostVector();
 
  // Get the neutrino 4-momentum at the LAB
  GHepParticle * nu = evrec->Probe();
  const TLorentzVector & p4v_lab = *(nu->P4());
 
  // Get the neutrino 4-momentum at the NRF
  TLorentzVector p4v_nrf = p4v_lab;
  p4v_nrf.Boost(-1.*beta);
 
  // Generate the photon cos(theta) with respect to the neutrino direction
  // (at NRF) and a uniform azimuthal angle phi
  double costheta_gamma = -1.0 + 2.0 * rnd->RndKine().Rndm();
  double phi_gamma      =  2.0 * kPi * rnd->RndKine().Rndm();
 
  // Generate the fraction of the neutrino energy taken by the photon
  double efrac_gamma =  rnd->RndKine().Rndm();
 
  // Calculate the photon energy at the NRF
  double Ev_nrf = p4v_nrf.Energy();
  double Egamma_nrf = Ev_nrf * efrac_gamma;
 
  // Calculate the photon momentum components at a rotated NRF (NRF')
  // where z is along the neutrino direction
  double sintheta_gamma = TMath::Sqrt(1-TMath::Power(costheta_gamma,2));
  double pgamma_nrf_p = Egamma_nrf * costheta_gamma; // p(//)
  double pgamma_nrf_t = Egamma_nrf * sintheta_gamma; // p(-|)
  double px = pgamma_nrf_t * TMath::Sin(phi_gamma);
  double py = pgamma_nrf_t * TMath::Cos(phi_gamma);
  double pz = pgamma_nrf_p;
 
  // Take a unit vector along the neutrino direction @ the NRF
  TVector3 unit_nudir = p4v_nrf.Vect().Unit();
 
  // Rotate the photon momentum vector from NRF' -> NRF
  TVector3 p3gamma_nrf(px,py,pz);
  p3gamma_nrf.RotateUz(unit_nudir);
 
  // Get the photon 4-momentum back at the LAB
  TLorentzVector p4gamma_lab(p3gamma_nrf, Egamma_nrf);
  p4gamma_lab.Boost(beta);
 
  // Add the photon at the event record
  const TLorentzVector & vtx = *(nu->X4());
  GHepParticle p(kPdgGamma,kIStStableFinalState,0,-1,-1,-1,p4gamma_lab,vtx);
  evrec->AddParticle(p);
}

References genie::GHepRecord::AddParticle(), genie::GHepRecord::HitNucleon(), genie::RandomGen::Instance(), genie::kIStStableFinalState, genie::kPdgGamma, genie::constants::kPi, LOG, genie::GHepParticle::P4(), pINFO, genie::GHepRecord::Probe(), genie::RandomGen::RndKine(), and genie::GHepParticle::X4().

Referenced by ProcessEventRecord().

AddRecoilNucleon()

void AMNuGammaGenerator::AddRecoilNucleon ( GHepRecord * event_rec ) const

private

p.SetRemovalEnergy(w);

Definition at line 134 of file AMNuGammaGenerator.cxx.

{
// Adding the recoil nucleon.
// Recoil is negligible at the H3 model. However, for nuclear targets, the
// hit nucleon was off-the-mass-shell (bound). Doing some magic here to bring
// it back on-the-mass-shell so that it can be INTRANUKE'ed and appear in
// the final state. The nucleon will keep its original (Fermi) 3-momentum but
// take some energy back from the remnant nucleus. No such tweaking takes
// place for free nucleon targets.
 
  LOG("AMNuGammaGenerator", pINFO) << "Adding recoil nucleon";
 
  // Get the interaction target
  GHepParticle * tgt_nucleus = evrec->TargetNucleus();
  bool is_nuclear_target = (tgt_nucleus!=0);
 
  // Get the hit nucleon
  GHepParticle * hitnuc = evrec->HitNucleon();
  assert(hitnuc);
 
  // Get the hit nucleon pdg code (= recoil nucleon pdg code)
  int pdgc = hitnuc->Pdg();
 
  // Get the hit nucleon 4-momentum (LAB)
  const TLorentzVector & p4n = *(hitnuc->P4());
  TLorentzVector p4(p4n);
 
  // Tweak the 4-momentum to bring the recoil nucleon on-the-mass-shell
  // (for nuclear targets only)
  if (is_nuclear_target) {
    double p = p4.Vect().Mag();
    double m = PDGLibrary::Instance()->Find(pdgc)->Mass();
    double E = TMath::Sqrt(m*m+p*p);
    p4.SetE(E);
  }
 
  // Get the vtx position
  GHepParticle * neutrino  = evrec->Probe();
  const TLorentzVector & vtx = *(neutrino->X4());
 
  // Add the recoil nucleon at the event record
  GHepStatus_t ist = (is_nuclear_target) ?
                      kIStHadronInTheNucleus : kIStStableFinalState;
  int mom = evrec->HitNucleonPosition();
 
  LOG("AMNuGammaGenerator", pINFO)
                  << "Adding recoil baryon [pdgc = " << pdgc << "]";
 
  GHepParticle p(pdgc, ist, mom,-1,-1,-1, p4, vtx);
//  double w = hitnuc->RemovalEnergy();
///  p.SetRemovalEnergy(w);
  evrec->AddParticle(p);
}

References genie::GHepRecord::AddParticle(), genie::PDGLibrary::Find(), genie::GHepRecord::HitNucleon(), genie::GHepRecord::HitNucleonPosition(), genie::PDGLibrary::Instance(), genie::kIStHadronInTheNucleus, genie::kIStStableFinalState, LOG, genie::GHepParticle::P4(), genie::GHepParticle::Pdg(), pINFO, genie::GHepRecord::Probe(), genie::GHepRecord::TargetNucleus(), and genie::GHepParticle::X4().

Referenced by ProcessEventRecord().

AddTargetRemnant()

void AMNuGammaGenerator::AddTargetRemnant ( GHepRecord * event_rec ) const

private

Definition at line 188 of file AMNuGammaGenerator.cxx.

{
// Add the remnant nuclear target at the GHEP record
 
  LOG("AMNuGammaGenerator", pINFO) << "Adding final state nucleus";
 
  // Skip for non nuclear targets
  GHepParticle * nucleus = evrec->TargetNucleus();
  if (!nucleus) {
    LOG("AMNuGammaGenerator", pDEBUG)
     << "No nucleus in the initial state - no remnant nucleus to add in the f/s";
    return;
  }
 
  // Compute A,Z for final state nucleus & get its PDG code and its mass
  //GHepParticle * nucleon = evrec->HitNucleon();
 
  GHepParticle * hit_nucleon = evrec->HitNucleon(); // hit
  GHepParticle * rec_nucleon = evrec->Particle(hit_nucleon->FirstDaughter()); // recoil
 
  assert(rec_nucleon);
  int  npdgc = rec_nucleon->Pdg();
  bool is_p  = pdg::IsProton(npdgc);
  int A = nucleus->A();
  int Z = nucleus->Z();
  if (is_p) Z--;
  A--;
  int ipdgc = pdg::IonPdgCode(A, Z);
  TParticlePDG * remnant = PDGLibrary::Instance()->Find(ipdgc);
  if(!remnant) {
      LOG("AMNuGammaGenerator", pFATAL)
          << "No particle with [A = " << A << ", Z = " << Z
                            << ", pdgc = " << ipdgc << "] in PDGLibrary!";
      assert(remnant);
  }
 
  // Figure out the remnant 4-momentum
  double Mf  = remnant->Mass();
  double Mf2 = TMath::Power(Mf,2);
  double px  = -1.* rec_nucleon->Px();
  double py  = -1.* rec_nucleon->Py();
  double pz  = -1.* rec_nucleon->Pz();
  double E   = TMath::Sqrt(Mf2 + rec_nucleon->P4()->Vect().Mag2());
  E += (hit_nucleon->P4()->E() - rec_nucleon->P4()->E());
 
  //-- Add the nucleus to the event record
  LOG("AMNuGammaGenerator", pINFO)
       << "Adding nucleus [A = " << A << ", Z = " << Z
                                           << ", pdgc = " << ipdgc << "]";
  int mom = evrec->TargetNucleusPosition();
  evrec->AddParticle(
           ipdgc,kIStStableFinalState, mom,-1,-1,-1, px,py,pz,E, 0,0,0,0);
}

References genie::GHepParticle::A(), genie::GHepRecord::AddParticle(), genie::PDGLibrary::Find(), genie::GHepParticle::FirstDaughter(), genie::GHepRecord::HitNucleon(), genie::PDGLibrary::Instance(), genie::pdg::IonPdgCode(), genie::pdg::IsProton(), genie::kIStStableFinalState, LOG, genie::GHepParticle::P4(), genie::GHepRecord::Particle(), pDEBUG, genie::GHepParticle::Pdg(), pFATAL, pINFO, genie::GHepParticle::Px(), genie::GHepParticle::Py(), genie::GHepParticle::Pz(), genie::GHepRecord::TargetNucleus(), genie::GHepRecord::TargetNucleusPosition(), and genie::GHepParticle::Z().

ProcessEventRecord()

void AMNuGammaGenerator::ProcessEventRecord ( GHepRecord * event_rec ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 45 of file AMNuGammaGenerator.cxx.

{
  this->AddPhoton(evrec);
  this->AddFinalStateNeutrino(evrec);
  this->AddRecoilNucleon(evrec);
//this->AddTargetRemnant(evrec);
}

References AddFinalStateNeutrino(), AddPhoton(), and AddRecoilNucleon().

---

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

• AMNuGammaGenerator.h
• AMNuGammaGenerator.cxx