Generates the 'final state' hadronic system in v SPP interactions. It adds the remnant nucleus (if any) and the baryon resonance decay products at the GHEP record. The resonance decay products are pre- determined since in this thread we generate exclusive SPP reactions. The module uses a simple phase space decay. Is a concrete implementation of the EventRecordVisitorI interface. More...

#include <RSPPHadronicSystemGenerator.h>

Inheritance diagram for genie::RSPPHadronicSystemGenerator:

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Collaboration diagram for genie::RSPPHadronicSystemGenerator:

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Public Member Functions
	RSPPHadronicSystemGenerator ()

	RSPPHadronicSystemGenerator (string config)

	~RSPPHadronicSystemGenerator ()

void	ProcessEventRecord (GHepRecord *event_rec) const

Public Member Functions inherited from genie::HadronicSystemGenerator
void	AddTargetNucleusRemnant (GHepRecord *event_rec) const

void	AddFinalHadronicSyst (GHepRecord *event_rec) const

void	PreHadronTransportDecays (GHepRecord *event_rec) const

TLorentzVector	Hadronic4pLAB (GHepRecord *event_rec) const

TLorentzVector	MomentumTransferLAB (GHepRecord *event_rec) const

TVector3	HCM2LAB (GHepRecord *event_rec) const

int	HadronShowerCharge (GHepRecord *event_rec) const

int	ResonanceCharge (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. 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	AddResonanceDecayProducts (GHepRecord *event_rec) const

Private Attributes
TGenPhaseSpace	fPhaseSpaceGenerator

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::HadronicSystemGenerator
	HadronicSystemGenerator ()

	HadronicSystemGenerator (string name)

	HadronicSystemGenerator (string name, string config)

	~HadronicSystemGenerator ()

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::HadronicSystemGenerator
const EventRecordVisitorI *	fPreINukeDecayer

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

Generates the 'final state' hadronic system in v SPP interactions. It adds the remnant nucleus (if any) and the baryon resonance decay products at the GHEP record. The resonance decay products are pre- determined since in this thread we generate exclusive SPP reactions. The module uses a simple phase space decay. Is a concrete implementation of the EventRecordVisitorI interface.

Author: Costas Andreopoulos <c.andreopoulos cern.ch> University of Liverpool

Created:: November 23, 2004

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

Definition at line 32 of file RSPPHadronicSystemGenerator.h.

Constructor & Destructor Documentation

RSPPHadronicSystemGenerator::RSPPHadronicSystemGenerator ( )

Definition at line 30 of file RSPPHadronicSystemGenerator.cxx.

                                                          :
 HadronicSystemGenerator("genie::RSPPHadronicSystemGenerator")
 {
 
 }

RSPPHadronicSystemGenerator::RSPPHadronicSystemGenerator ( string config )

Definition at line 36 of file RSPPHadronicSystemGenerator.cxx.

                                                                      :
 HadronicSystemGenerator("genie::RSPPHadronicSystemGenerator", config)
 {
 
 }

RSPPHadronicSystemGenerator::~RSPPHadronicSystemGenerator ( )

Definition at line 42 of file RSPPHadronicSystemGenerator.cxx.

 {
 
 }

Member Function Documentation

void RSPPHadronicSystemGenerator::AddResonanceDecayProducts ( GHepRecord * event_rec ) const

private

Definition at line 55 of file RSPPHadronicSystemGenerator.cxx.

References genie::GHepRecord::AddParticle(), genie::SppChannel::FinStateNucleon(), genie::SppChannel::FinStatePion(), fPhaseSpaceGenerator, genie::SppChannel::FromInteraction(), genie::GHepParticle::GetP4(), genie::Interaction::InitState(), genie::PDGLibrary::Instance(), genie::Target::IsNucleus(), genie::kIStDecayedState, genie::kIStHadronInTheNucleus, genie::kIStStableFinalState, LOG, genie::utils::res::Mass(), genie::utils::print::P4AsString(), genie::GHepRecord::Particle(), pINFO, genie::GHepParticle::SetStatus(), genie::GHepRecord::Summary(), genie::InitialState::Tgt(), and genie::GHepParticle::X4().

Referenced by ProcessEventRecord().

 {
 // generate momenta for the baryon resonance decay products and add them at
 // the event record
 
   //-- find out which SPP channel we are generating
   Interaction * interaction = evrec->Summary();
   SppChannel_t spp_channel = SppChannel::FromInteraction(interaction);
 
   //-- get the final state nucleon and pion
   int nuc_pdgc = SppChannel::FinStateNucleon (spp_channel);
   int pi_pdgc  = SppChannel::FinStatePion    (spp_channel);
 
   //-- get the total 4-p for the two-hadron system (= parent resonance 4-p)
 
   const InitialState & init_state = interaction->InitState();
   bool is_nucleus = init_state.Tgt().IsNucleus();
 
   //-- access the resonance entry at the GHEP record
   int res_pos = 0;
   if(is_nucleus) res_pos = 4;
   else           res_pos = 3;
 
   GHepParticle * res  = evrec->Particle(res_pos);
   const TLorentzVector & x4 = *(res->X4());
 
   //-- mark the resonance as decayed
   res->SetStatus(kIStDecayedState);
 
   //-- generate 4-p for the two-hadron system
   double mnuc = PDGLibrary::Instance() -> Find(nuc_pdgc) -> Mass();
   double mpi  = PDGLibrary::Instance() -> Find(pi_pdgc)  -> Mass();
 
   double mass[2] = { mnuc, mpi };
 
   TLorentzVector * p4 = res->GetP4();
 
   LOG("RESHadronicVtx", pINFO)
                  << "\n RES 4-P = " << utils::print::P4AsString(p4);
 
   bool is_permitted = fPhaseSpaceGenerator.SetDecay(*p4, 2, mass);
   assert(is_permitted);
 
   fPhaseSpaceGenerator.Generate();
 
   //-- add the two hadrons at the event record
   TLorentzVector & p4_nuc = *fPhaseSpaceGenerator.GetDecay(0);
   TLorentzVector & p4_pi  = *fPhaseSpaceGenerator.GetDecay(1);
   TLorentzVector vdummy(0,0,0,0); // dummy 'vertex'
 
   // decide the particle status
   GHepStatus_t ist = (is_nucleus) ?
                               kIStHadronInTheNucleus : kIStStableFinalState;
   int mom = res_pos;
   evrec->AddParticle(nuc_pdgc, ist, mom,-1,-1,-1, p4_nuc, x4);
   evrec->AddParticle(pi_pdgc,  ist, mom,-1,-1,-1, p4_pi,  x4);
   delete p4;
 }

void RSPPHadronicSystemGenerator::ProcessEventRecord ( GHepRecord * event_rec ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 47 of file RSPPHadronicSystemGenerator.cxx.

References AddResonanceDecayProducts().

 {
 // This method generates the final state hadronic system
 
   //-- Add the baryon resonance decay products at the event record
   this->AddResonanceDecayProducts(evrec);
 }

Member Data Documentation

TGenPhaseSpace genie::RSPPHadronicSystemGenerator::fPhaseSpaceGenerator

mutableprivate

Definition at line 45 of file RSPPHadronicSystemGenerator.h.

Referenced by AddResonanceDecayProducts().

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

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation