Generates the final state hadronic system in v DIS interactions. Is a concrete implementation of the EventRecordVisitorI interface. More...

#include <DISHadronicSystemGenerator.h>

Inheritance diagram for genie::DISHadronicSystemGenerator:

Public Member Functions
	DISHadronicSystemGenerator ()

	DISHadronicSystemGenerator (string config)

	~DISHadronicSystemGenerator ()

void	ProcessEventRecord (GHepRecord *event_rec) const

void	Configure (const Registry &config)

void	Configure (string config)

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	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	SimulateFormationZone (GHepRecord *event_rec) const

void	LoadConfig (void)

Private Attributes
const EventRecordVisitorI *	fHadronizationModel

bool	fFilterPreFragmEntries

double	fR0
	param controling nuclear size More...

double	fNR
	how far beyond the nuclear boundary does the particle tracker goes? More...

double	fct0pion
	formation zone (c * formation time) - for pions More...

double	fct0nucleon
	formation zone (c * formation time) - for nucleons More...

double	fK
	param multiplying pT^2 in formation zone calculation More...

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)

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

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 DIS interactions. Is a concrete implementation of the EventRecordVisitorI interface.

Author: Costas Andreopoulos <constantinos.andreopoulos cern.ch> University of Liverpool & STFC Rutherford Appleton Laboratory

October 03, 2004

Definition at line 26 of file DISHadronicSystemGenerator.h.

Constructor & Destructor Documentation

DISHadronicSystemGenerator::DISHadronicSystemGenerator ( )

Definition at line 36 of file DISHadronicSystemGenerator.cxx.

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

DISHadronicSystemGenerator::DISHadronicSystemGenerator ( string config )

Definition at line 42 of file DISHadronicSystemGenerator.cxx.

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

DISHadronicSystemGenerator::~DISHadronicSystemGenerator ( )

Definition at line 48 of file DISHadronicSystemGenerator.cxx.

 {
 
 }

Member Function Documentation

void DISHadronicSystemGenerator::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 161 of file DISHadronicSystemGenerator.cxx.

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

void DISHadronicSystemGenerator::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 167 of file DISHadronicSystemGenerator.cxx.

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

void DISHadronicSystemGenerator::LoadConfig ( void )

private

Definition at line 173 of file DISHadronicSystemGenerator.cxx.

 {
   fHadronizationModel = 0;
   fPreINukeDecayer    = 0;
 
   //-- Get the requested hadronization model
   fHadronizationModel =
      dynamic_cast<const EventRecordVisitorI *> (this->SubAlg("Hadronizer"));
   assert(fHadronizationModel);
 
   //-- Handle pre-intranuke decays
   fPreINukeDecayer =
      dynamic_cast<const EventRecordVisitorI *> (this->SubAlg("PreTransportDecayer"));
   assert(fPreINukeDecayer);
 
   //-- Get flag to determine whether we copy all fragmentation record entries
   //   into the GHEP record or just the ones marked with kf=1
   GetParamDef( "FilterPreFragm", fFilterPreFragmEntries, false ) ;
 
   //-- Get parameters controlling the nuclear sizes
   GetParam( "NUCL-R0", fR0 ) ;
   GetParam( "NUCL-NR", fNR ) ;
 
   //-- Get parameters controlling the formation zone simulation
   GetParam( "FZONE-ct0pion", fct0pion ) ;
   GetParam( "FZONE-ct0nucleon",fct0nucleon ) ;
   GetParam( "FZONE-KPt2", fK ) ;
 
   LOG("DISHadronicVtx", pDEBUG) << "ct0pion     = " << fct0pion    << " fermi";
   LOG("DISHadronicVtx", pDEBUG) << "ct0nucleon  = " << fct0nucleon << " fermi";
   LOG("DISHadronicVtx", pDEBUG) << "K(pt^2) = " << fK;
 }

void DISHadronicSystemGenerator::ProcessEventRecord ( GHepRecord * event_rec ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 53 of file DISHadronicSystemGenerator.cxx.

 {
 // This method generates the final state hadronic system
 
   //-- Add an entry for the DIS Pre-Fragm. Hadronic State
   this->AddFinalHadronicSyst(evrec);
 
   // set W in the Event Summary
   //-- Compute the hadronic system invariant mass
   TLorentzVector p4Had = this->Hadronic4pLAB(evrec);
 
   Interaction * interaction = evrec->Summary();
   interaction->KinePtr()->SetW( p4Had.M() );
 
   //-- Add the fragmentation products
   fHadronizationModel -> ProcessEventRecord( evrec ) ;
 
 
   //-- Simulate the formation zone if not taken directly from the
   //   hadronization model
   this->SimulateFormationZone(evrec);
 }

void DISHadronicSystemGenerator::SimulateFormationZone ( GHepRecord * event_rec ) const

private

Definition at line 76 of file DISHadronicSystemGenerator.cxx.

 {
   LOG("DISHadronicVtx", pDEBUG)
     << "Simulating formation zone for the DIS hadronic system";
 
   GHepParticle * nucltgt = evrec->TargetNucleus();
   if (!nucltgt) {
     LOG("DISHadronicVtx", pDEBUG)
      << "No nuclear target was found - No need to simulate formation zones";
     return;
   }
   // Compute the nuclear radius & how far away a particle is being tracked by
   // the intranuclear hadron transport
   assert(nucltgt && pdg::IsIon(nucltgt->Pdg()));
   double A = nucltgt->A();
   double R = fR0 * TMath::Power(A, 1./3.);
   R *= TMath::Max(fNR,1.); // particle is tracked much further outside the nuclear boundary as the density is non-zero
 
   // Decay very short living particles so that we can give the formation
   // zone to the daughters
   this->PreHadronTransportDecays(evrec);
 
   // Get hadronic system's 3-momentum
   GHepParticle * hadronic_system = evrec->FinalStateHadronicSystem();
   TVector3 p3hadr = hadronic_system->P4()->Vect(); // (px,py,pz)
 
   // Loop over GHEP and set the formation zone to the right particles
   // Limit the maximum formation zone so that particles escaping the
   // nucleus are placed right outside...
 
   TObjArrayIter piter(evrec);
   GHepParticle * p = 0;
   int icurr = -1;
 
   while( (p = (GHepParticle *) piter.Next()) )
   {
     icurr++;
 
     GHepStatus_t ist = p->Status();
     bool apply_formation_zone = (ist==kIStHadronInTheNucleus);
 
     if(!apply_formation_zone) continue;
 
     LOG("DISHadronicVtx", pINFO)
       << "Applying formation-zone to " << p->Name();
 
     double m = p->Mass();
     int pdgc = p->Pdg();
     const TLorentzVector & p4 = *(p->P4());
     double ct0=0.;
     pdg::IsNucleon(pdgc) ? ct0=fct0nucleon : ct0=fct0pion;
     double fz = phys::FormationZone(m,p4,p3hadr,ct0,fK);
 
     //-- Apply the formation zone step
 
     double step = fz;
     TVector3 dr = p->P4()->Vect().Unit();            // unit vector along its direction
  // double c  = kLightSpeed / (units::fm/units::ns); // c in fm/nsec
     dr.SetMag(step);                                 // spatial step size
  // double dt = step/c;                              // temporal step:
     double dt = 0;
     TLorentzVector dx4(dr,dt);                       // 4-vector step
     TLorentzVector x4new = *(p->X4()) + dx4;         // new position
 
     //-- If the formation zone was large enough that the particle is now outside
     //   the nucleus make sure that it is not placed further away from the
     //   (max distance particles tracked by intranuclear cascade) + ~2 fm
     double epsilon = 2; // fm
     double r       = x4new.Vect().Mag(); // fm
     double rmax    = R+epsilon;
     if(r > rmax) {
         LOG("DISHadronicVtx", pINFO)
           << "Particle was stepped too far away (r = " << r << " fm)";
         LOG("DISHadronicVtx", pINFO)
           << "Placing it ~2 fm away from the furthermost position tracked "
           << "by intranuclear cascades (r' = " << rmax << " fm)";
         double scale = rmax/r;
         x4new *= scale;
     }
 
     p->SetPosition(x4new);
   }
 }