Generates an intermediate baryon resonance for exclusive interactions proceeding through resonance productions and adds it to the event record. The resonance is selected based on its contribution to the selected exclusive reaction cross section. Is a concrete implementation of the EventRecordVisitorI interface. More...

#include <RSPPResonanceSelector.h>

Inheritance diagram for genie::RSPPResonanceSelector:

Public Member Functions
	RSPPResonanceSelector ()

	RSPPResonanceSelector (string config)

	~RSPPResonanceSelector ()

void	ProcessEventRecord (GHepRecord *event_rec) const

void	Configure (const Registry &config)

void	Configure (string param_set)

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	LoadConfig (void)

Resonance_t	SelectResonance (GHepRecord *event_rec) const

void	AddResonance (GHepRecord *event_rec) const

Private Attributes
BaryonResList	fResList
	baryon resonances taken into account 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 an intermediate baryon resonance for exclusive interactions proceeding through resonance productions and adds it to the event record. The resonance is selected based on its contribution to the selected exclusive reaction cross section. Is a concrete implementation of the EventRecordVisitorI interface.

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

November 18, 2004

Definition at line 31 of file RSPPResonanceSelector.h.

Constructor & Destructor Documentation

RSPPResonanceSelector::RSPPResonanceSelector ( )

Definition at line 34 of file RSPPResonanceSelector.cxx.

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

RSPPResonanceSelector::RSPPResonanceSelector ( string config )

Definition at line 40 of file RSPPResonanceSelector.cxx.

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

RSPPResonanceSelector::~RSPPResonanceSelector ( )

Definition at line 46 of file RSPPResonanceSelector.cxx.

 {
 
 }

Member Function Documentation

void RSPPResonanceSelector::AddResonance ( GHepRecord * event_rec ) const

private

Definition at line 155 of file RSPPResonanceSelector.cxx.

 {
   // compute RES p4 = p4(neutrino) + p4(hit nucleon) - p4(primary lepton)
   TLorentzVector p4 = this->Hadronic4pLAB(evrec);
 
   //-- Determine the RES pdg code (from the selected Resonance_t & charge)
   Interaction * interaction = evrec->Summary();
   Resonance_t res = interaction->ExclTag().Resonance();
   int charge = this->ResonanceCharge(evrec);
   int pdgc   = utils::res::PdgCode(res,charge);
 
   LOG("RESSelector", pNOTICE)
                << "Adding RES with PDGC = " << pdgc << ", Q = " << charge;
 
   //-- Add the resonance at the EventRecord
   GHepStatus_t ist = kIStPreDecayResonantState;
   int mom = evrec->HitNucleonPosition();
 
   evrec->AddParticle(
         pdgc, ist, mom,-1,-1,-1, p4.Px(),p4.Py(),p4.Pz(),p4.E(), 0,0,0,0);
 }

void RSPPResonanceSelector::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 177 of file RSPPResonanceSelector.cxx.

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

void RSPPResonanceSelector::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 183 of file RSPPResonanceSelector.cxx.

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

void RSPPResonanceSelector::LoadConfig ( void )

private

Definition at line 189 of file RSPPResonanceSelector.cxx.

 {
   fResList.Clear();
   string resonances = "";
   this->GetParam("ResonanceNameList", resonances);
   SLOG("RESSelector", pDEBUG) << "Resonance list: " << resonances;
 
   fResList.DecodeFromNameList(resonances);
   LOG("RESSelector", pINFO) << fResList;
 }

void RSPPResonanceSelector::ProcessEventRecord ( GHepRecord * event_rec ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 51 of file RSPPResonanceSelector.cxx.

 {
   //-- select a baryon resonance
   Resonance_t res = this->SelectResonance(evrec);
   assert(res != kNoResonance);
 
   //-- add the resonance at the event summary
   Interaction * interaction = evrec->Summary();
   interaction->ExclTagPtr()->SetResonance(res);
 
   //-- add an entry at the GHep event record & the event summary
   this->AddResonance(evrec);
 }

Resonance_t RSPPResonanceSelector::SelectResonance ( GHepRecord * event_rec ) const

private

Definition at line 65 of file RSPPResonanceSelector.cxx.

 {
 // Select a baryon resonance from a list of considered resonances based on
 // their differential d^2xsec/dWdQ^2 cross sections
 
   LOG("RESSelector", pNOTICE) << "Selecting a baryon resonance";
 
   Interaction * interaction = evrec->Summary();
 
   //-- Figure out what the resonance charge should be.
   int q_res = this->ResonanceCharge(evrec);
 
   //-- Use selected kinematics
   interaction->KinePtr()->UseSelectedKinematics();
 
   //-- Trust kinematics and process type already set.
   interaction->SetBit(kISkipProcessChk);
   interaction->SetBit(kISkipKinematicChk);
 
   //-- Access cross section algorithm for running thread
   //   The algorithm must be able to compute the RES contribution to
   //   the specified RES/SPP channel
   RunningThreadInfo * rtinfo = RunningThreadInfo::Instance();
   const EventGeneratorI * evg = rtinfo->RunningThread();
   const XSecAlgorithmI * xsecalg = evg->CrossSectionAlg();
 
   //-- Loop over all considered baryon resonances and compute the double
   //   differential cross section for the selected kinematical variables
 
   double xsec_sum  = 0;
   unsigned int nres = fResList.NResonances();
   vector<double> xsec_vec(nres);
 
   for(unsigned int ires = 0; ires < nres; ires++) {
 
      //-- Current resonance
      Resonance_t res = fResList.ResonanceId(ires);
 
      //-- Set the current resonance at the interaction summary
      //   compute the differential cross section d^2xsec/dWdQ^2
      //   (do it only for resonances that can conserve charge)
      interaction->ExclTagPtr()->SetResonance(res);
 
      double xsec = 0;
      bool   skip = (q_res==2 && !utils::res::IsDelta(res));
 
      if(!skip) xsec = xsecalg->XSec(interaction,kPSWQ2fE);
      else {
        SLOG("RESSelector", pNOTICE)
                  << "RES: " << utils::res::AsString(res)
                          << " would not conserve charge -- skipping it";
      }
      //-- For the ith resonance store the sum of (xsec) * (breit-wigner)
      //   for the resonances in the range [0,i]
      xsec_sum      += xsec;
      xsec_vec[ires] = xsec_sum;
 
      SLOG("RESSelector", pNOTICE)
           << "Resonances (0->" << ires << "): "
            << "Sum{ BW(W) * d^2xsec(E,W,Q^2)/dWd*Q^2 } = "  << xsec_sum;
   } // res
 
   //-- Reset 'trust' bits
   interaction->ResetBit(kISkipProcessChk);
   interaction->ResetBit(kISkipKinematicChk);
 
   //-- Reset running kinematics
   interaction->KinePtr()->ClearRunningValues();
 
   //-- Use the computed differential cross sections to select a resonance
   RandomGen * rnd = RandomGen::Instance();
   double R = xsec_sum * rnd->RndGen().Rndm();
 
   SLOG("RESSelector", pDEBUG) << "R = " << R;
 
   for(unsigned int ires = 0; ires < nres; ires++) {
      SLOG("RESSelector", pDEBUG)
                     << "SUM-XSEC(0->" << ires <<") = " << xsec_vec[ires];
 
      if(R < xsec_vec[ires]) {
         Resonance_t sres = fResList.ResonanceId(ires); // selected RES.
         LOG("RESSelector", pNOTICE)
                    << "Selected RES = " << utils::res::AsString(sres);
         return sres;
      }
   }
   LOG("RESSelector", pERROR) << "** Failed to select a resonance";
   return kNoResonance;
 }

Member Data Documentation

BaryonResList genie::RSPPResonanceSelector::fResList

private

baryon resonances taken into account

Definition at line 52 of file RSPPResonanceSelector.h.

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

Generator/src/Physics/Resonance/EventGen/RSPPResonanceSelector.h
Generator/src/Physics/Resonance/EventGen/RSPPResonanceSelector.cxx

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation