Generates values for the kinematic variables describing QEL neutrino interaction events for Smith-Moniz model. Is a concrete implementation of the EventRecordVisitorI interface. More...

#include <QELEventGeneratorSM.h>

Inheritance diagram for genie::QELEventGeneratorSM:

Public Member Functions
	QELEventGeneratorSM ()

	QELEventGeneratorSM (string config)

	~QELEventGeneratorSM ()

void	ProcessEventRecord (GHepRecord *event_rec) 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. 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)

double	ComputeMaxXSec (const Interaction *in) const

void	AddTargetNucleusRemnant (GHepRecord *evrec) const
	add a recoiled nucleus remnant More...

double	ComputeMaxXSec2 (const Interaction *in) const

double	MaxXSec2 (GHepRecord *evrec) const

double	FindMaxXSec2 (const Interaction *in) const

void	CacheMaxXSec2 (const Interaction *in, double xsec) const

CacheBranchFx *	AccessCacheBranch2 (const Interaction *in) const

double	ComputeMaxDiffv (const Interaction *in) const

double	MaxDiffv (GHepRecord *evrec) const

double	FindMaxDiffv (const Interaction *in) const

void	CacheMaxDiffv (const Interaction *in, double xsec) const

CacheBranchFx *	AccessCacheBranchDiffv (const Interaction *in) const

Private Attributes
SmithMonizUtils *	sm_utils

KinePhaseSpace_t	fkps

bool	fGenerateNucleonInNucleus
	generate struck nucleon in nucleus More...

double	fQ2Min
	Q2-threshold for seeking the second maximum. More...

double	fSafetyFacor_nu

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::KineGeneratorWithCache
	KineGeneratorWithCache ()

	KineGeneratorWithCache (string name)

	KineGeneratorWithCache (string name, string config)

	~KineGeneratorWithCache ()

virtual double	MaxXSec (GHepRecord *evrec) const

virtual double	FindMaxXSec (const Interaction *in) const

virtual void	CacheMaxXSec (const Interaction *in, double xsec) const

virtual double	Energy (const Interaction *in) const

virtual CacheBranchFx *	AccessCacheBranch (const Interaction *in) const

virtual void	AssertXSecLimits (const Interaction *in, double xsec, double xsec_max) const

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::KineGeneratorWithCache
const XSecAlgorithmI *	fXSecModel

double	fSafetyFactor
	maxxsec -> maxxsec * safety_factor More...

double	fMaxXSecDiffTolerance
	max{100(xsec-maxxsec)/.5(xsec+maxxsec)} if xsec>maxxsec More...

double	fEMin
	min E for which maxxsec is cached - forcing explicit calc. More...

bool	fGenerateUniformly
	uniform over allowed phase space + event weight? More...

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 values for the kinematic variables describing QEL neutrino interaction events for Smith-Moniz model. Is a concrete implementation of the EventRecordVisitorI interface.

[1] R.A.Smith and E.J.Moniz, Nuclear Physics B43, (1972) 605-622
[2] K.S. Kuzmin, V.V. Lyubushkin, V.A.Naumov Eur. Phys. J. C54, (2008) 517-538

Author: Igor Kakorin kakor.nosp@m.in@j.nosp@m.inr.r.nosp@m.u
Joint Institute for Nuclear Research
adapted from fortran code provided by:

Konstantin Kuzmin kkuzm.nosp@m.in@t.nosp@m.heor..nosp@m.jinr.nosp@m..ru,
Joint Institute for Nuclear Research, Institute for Theoretical and Experimental Physics
Vladimir Lyubushkin,
Joint Institute for Nuclear Research
Vadim Naumov vnaum.nosp@m.ov@t.nosp@m.heor..nosp@m.jinr.nosp@m..ru,
Joint Institute for Nuclear Research
based on code of: Costas Andreopoulos <constantinos.andreopoulos cern.ch> University of Liverpool & STFC Rutherford Appleton Laboratory

May 05, 2017

Definition at line 48 of file QELEventGeneratorSM.h.

Constructor & Destructor Documentation

QELEventGeneratorSM::QELEventGeneratorSM ( )

Definition at line 63 of file QELEventGeneratorSM.cxx.

                                          :
 KineGeneratorWithCache("genie::QELEventGeneratorSM")
 {
 
 }

QELEventGeneratorSM::QELEventGeneratorSM ( string config )

Definition at line 69 of file QELEventGeneratorSM.cxx.

                                                       :
 KineGeneratorWithCache("genie::QELEventGeneratorSM", config)
 {
 
 }

QELEventGeneratorSM::~QELEventGeneratorSM ( )

Definition at line 75 of file QELEventGeneratorSM.cxx.

 {
 
 }

Member Function Documentation

CacheBranchFx * QELEventGeneratorSM::AccessCacheBranch2 ( const Interaction * in ) const

private

Definition at line 641 of file QELEventGeneratorSM.cxx.

 {
 // Returns the cache branch for this algorithm and this interaction. If no
 // branch is found then one is created.
 
   Cache * cache = Cache::Instance();
 
   // build the cache branch key as: namespace::algorithm/config/interaction
   string algkey = this->Id().Key();
   string intkey = interaction->AsString();
   string key    = cache->CacheBranchKey(algkey, intkey, "2nd");
 
   CacheBranchFx * cache_branch =
               dynamic_cast<CacheBranchFx *> (cache->FindCacheBranch(key));
   if(!cache_branch) {
     //-- create the cache branch at the first pass
     LOG("Kinematics", pINFO) << "No Max d^nXSec/d{K}^n cache branch found";
     LOG("Kinematics", pINFO) << "Creating cache branch - key = " << key;
 
     cache_branch = new CacheBranchFx("max[d^nXSec/d^n{K}] over phase space");
     cache->AddCacheBranch(key, cache_branch);
   }
   assert(cache_branch);
 
   return cache_branch;
 }

CacheBranchFx * QELEventGeneratorSM::AccessCacheBranchDiffv ( const Interaction * in ) const

private

Definition at line 797 of file QELEventGeneratorSM.cxx.

 {
 // Returns the cache branch for this algorithm and this interaction. If no
 // branch is found then one is created.
 
   Cache * cache = Cache::Instance();
 
   // build the cache branch key as: namespace::algorithm/config/interaction
   string algkey = this->Id().Key();
   string intkey = interaction->AsString();
   string key    = cache->CacheBranchKey(algkey, intkey, "diffv");
 
   CacheBranchFx * cache_branch =
               dynamic_cast<CacheBranchFx *> (cache->FindCacheBranch(key));
   if(!cache_branch)
   {
     //-- create the cache branch at the first pass
     LOG("Kinematics", pINFO) << "No Max vmax(Q2)-vmin(Q2) cache branch found";
     LOG("Kinematics", pINFO) << "Creating cache branch - key = " << key;
 
     cache_branch = new CacheBranchFx("max[vmax(Q2)-vmin(Q2)] over phase space");
     cache->AddCacheBranch(key, cache_branch);
   }
   assert(cache_branch);
 
   return cache_branch;
 }

void QELEventGeneratorSM::AddTargetNucleusRemnant ( GHepRecord * evrec ) const

private

add a recoiled nucleus remnant

Definition at line 337 of file QELEventGeneratorSM.cxx.

 {
 // add the remnant nuclear target at the GHEP record
 
   LOG("QELEvent", pINFO) << "Adding final state nucleus";
 
   double Px = 0;
   double Py = 0;
   double Pz = 0;
   double E  = 0;
 
   GHepParticle * nucleus = evrec->TargetNucleus();
   int A = nucleus->A();
   int Z = nucleus->Z();
 
   int fd = nucleus->FirstDaughter();
   int ld = nucleus->LastDaughter();
 
   for(int id = fd; id <= ld; id++)
   {
 
      // compute A,Z for final state nucleus & get its PDG code and its mass
      GHepParticle * particle = evrec->Particle(id);
      assert(particle);
      int  pdgc = particle->Pdg();
      bool is_p  = pdg::IsProton (pdgc);
      bool is_n  = pdg::IsNeutron(pdgc);
 
      if (is_p) Z--;
      if (is_p || is_n) A--;
 
      Px += particle->Px();
      Py += particle->Py();
      Pz += particle->Pz();
      E  += particle->E();
 
   }//daughters
 
   TParticlePDG * remn = 0;
   int ipdgc = pdg::IonPdgCode(A, Z);
   remn = PDGLibrary::Instance()->Find(ipdgc);
   if(!remn)
   {
     LOG("HadronicVtx", pFATAL)
           << "No particle with [A = " << A << ", Z = " << Z
                             << ", pdgc = " << ipdgc << "] in PDGLibrary!";
     assert(remn);
   }
 
   double Mi = nucleus->Mass();
   Px *= -1;
   Py *= -1;
   Pz *= -1;
   E = Mi-E;
 
   // Add the nucleus to the event record
   LOG("QELEvent", pINFO)
      << "Adding nucleus [A = " << A << ", Z = " << Z
      << ", pdgc = " << ipdgc << "]";
 
   int imom = evrec->TargetNucleusPosition();
   evrec->AddParticle(
        ipdgc,kIStStableFinalState, imom,-1,-1,-1, Px,Py,Pz,E, 0,0,0,0);
 
   LOG("QELEvent", pINFO) << "Done";
   LOG("QELEvent", pINFO) << *evrec;
 }

void QELEventGeneratorSM::CacheMaxDiffv	(	const Interaction *	in,
		double	xsec
	)		const

private

Definition at line 774 of file QELEventGeneratorSM.cxx.

 {
   LOG("Kinematics", pINFO)
                        << "Adding the computed max{vmax(Q2)-vmin(Q2)} value to cache";
   CacheBranchFx * cb = this->AccessCacheBranchDiffv(interaction);
 
   double E = this->Energy(interaction);
   if(max_diffv>0) cb->AddValues(E,max_diffv);
 
   if(! cb->Spl() )
   {
     if( cb->Map().size() > 40 ) cb->CreateSpline();
   }
 
   if( cb->Spl() )
   {
      if( E < cb->Spl()->XMin() || E > cb->Spl()->XMax() )
      {
         cb->CreateSpline();
      }
   }
 }

void QELEventGeneratorSM::CacheMaxXSec2	(	const Interaction *	in,
		double	xsec
	)		const

private

Definition at line 620 of file QELEventGeneratorSM.cxx.

 {
   LOG("Kinematics", pINFO)
                        << "Adding the computed max{dxsec/dK} value to cache";
   CacheBranchFx * cb = this->AccessCacheBranch2(interaction);
 
   double E = this->Energy(interaction);
   if(max_xsec>0) cb->AddValues(E,max_xsec);
 
   if(! cb->Spl() ) {
     if( cb->Map().size() > 40 ) cb->CreateSpline();
   }
 
   if( cb->Spl() ) {
      if( E < cb->Spl()->XMin() || E > cb->Spl()->XMax() ) {
         cb->CreateSpline();
      }
   }
 }

double QELEventGeneratorSM::ComputeMaxDiffv ( const Interaction * in ) const

private

Definition at line 669 of file QELEventGeneratorSM.cxx.

 {
   double max_diffv = -1;
   const int N_Q2 = 10;
 
   Range1D_t rQ2 = sm_utils->Q2QES_SM_lim();
   for (int Q2_n = 0; Q2_n<N_Q2; Q2_n++) // Scan around Q2
   {
      double Q2 = rQ2.min + 1.*Q2_n * (rQ2.max-rQ2.min)/N_Q2;
      Range1D_t rv  = sm_utils->vQES_SM_lim(Q2);
      if (rv.max-rv.min > max_diffv)
         max_diffv = rv.max-rv.min;
   } // Done with Q2 scan
   max_diffv *= fSafetyFactor;
   return max_diffv;
 
 }

double QELEventGeneratorSM::ComputeMaxXSec ( const Interaction * in ) const

privatevirtual

Implements genie::KineGeneratorWithCache.

Definition at line 451 of file QELEventGeneratorSM.cxx.

 {
     double xsec_max = -1;
     const int N_Q2 = 8;
     const int N_v = 8;
 
     Range1D_t rQ2 = sm_utils->Q2QES_SM_lim();
     const double logQ2min = TMath::Log(TMath::Max(rQ2.min, eps));
     const double logQ2max = TMath::Log(TMath::Min(rQ2.max, fQ2Min));
 
     double tmp_xsec_max = -1;
     // Now scan through kinematical variables Q2,v
     for (int Q2_n=0; Q2_n < N_Q2; Q2_n++)
     {
        // Scan around Q2
        double Q2 = TMath::Exp(Q2_n * (logQ2max-logQ2min)/N_Q2 + logQ2min);
        Range1D_t rv  = sm_utils->vQES_SM_lim(Q2);
        const double logvmin = TMath::Log(TMath::Max(rv.min, eps));
        const double logvmax = TMath::Log(TMath::Max(rv.max, TMath::Max(rv.min, eps)));
        for (int v_n=0; v_n < N_v; v_n++)
        {
           // Scan around v
           double v = TMath::Exp(v_n * (logvmax-logvmin)/N_v + logvmin);
           Kinematics * kinematics = interaction->KinePtr();
           kinematics->SetKV(kKVQ2, Q2);
           kinematics->SetKV(kKVv, v);
           // Compute the QE cross section for the current kinematics
           double xs = fXSecModel->XSec(interaction, fkps);
           if (xs > tmp_xsec_max)
             tmp_xsec_max = xs;
        } // Done with v scan
     }// Done with Q2 scan
 
     xsec_max = tmp_xsec_max;
     // Apply safety factor, since value retrieved from the cache might
     // correspond to a slightly different value
     xsec_max *= fSafetyFactor;
     return xsec_max;
 
 }

double QELEventGeneratorSM::ComputeMaxXSec2 ( const Interaction * in ) const

private

Definition at line 492 of file QELEventGeneratorSM.cxx.

 {
     double xsec_max = -1;
     const int N_Q2 = 8;
     const int N_v = 8;
 
     Range1D_t rQ2 = sm_utils->Q2QES_SM_lim();
     if (rQ2.max<fQ2Min) return xsec_max;
     const double logQ2min = TMath::Log(fQ2Min);
     const double logQ2max = TMath::Log(rQ2.max);
 
     double tmp_xsec_max = -1;
     // Now scan through kinematical variables Q2,v
     for (int Q2_n=0; Q2_n < N_Q2; Q2_n++)
     {
        // Scan around Q2
        double Q2 = TMath::Exp(Q2_n * (logQ2max-logQ2min)/N_Q2 + logQ2min);
        Range1D_t rv  = sm_utils->vQES_SM_lim(Q2);
        const double logvmin = TMath::Log(TMath::Max(rv.min, eps));
        const double logvmax = TMath::Log(TMath::Max(rv.max, TMath::Max(rv.min, eps)));
        for (int v_n=0; v_n < N_v; v_n++)
        {
           // Scan around v
           double v = TMath::Exp(v_n * (logvmax-logvmin)/N_v + logvmin);
           Kinematics * kinematics = interaction->KinePtr();
           kinematics->SetKV(kKVQ2, Q2);
           kinematics->SetKV(kKVv, v);
           // Compute the QE cross section for the current kinematics
           double xs = fXSecModel->XSec(interaction, fkps);
           if (xs > tmp_xsec_max)
             tmp_xsec_max = xs;
        } // Done with v scan
     }// Done with Q2 scan
 
     xsec_max = tmp_xsec_max;
     // Apply safety factor, since value retrieved from the cache might
     // correspond to a slightly different value
     xsec_max *= fSafetyFactor;
     return xsec_max;
 
 }

void QELEventGeneratorSM::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 405 of file QELEventGeneratorSM.cxx.

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

void QELEventGeneratorSM::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 411 of file QELEventGeneratorSM.cxx.

 {
   Algorithm::Configure(config);
 
   Registry r( "QELEventGeneratorSM_specific", false ) ;
   r.Set( "sm_utils_algo", RgAlg("genie::SmithMonizUtils","Default") ) ;
 
   Algorithm::Configure(r) ;
 
   this->LoadConfig();
 }

double QELEventGeneratorSM::FindMaxDiffv ( const Interaction * in ) const

private

Definition at line 727 of file QELEventGeneratorSM.cxx.

 {
 // Find a cached maximum of vmax(Q2)-vmin(Q2) for xsec algorithm & interaction and
 // close to the specified energy
 
   // get neutrino energy
   double E = this->Energy(interaction);
   LOG("Kinematics", pINFO) << "E = " << E;
 
   if(E < fEMin) {
      LOG("Kinematics", pINFO)
          << "Below minimum energy - Forcing explicit calculation";
      return -1.;
   }
 
   // access the the cache branch
   CacheBranchFx * cb = this->AccessCacheBranchDiffv(interaction);
 
   // if there are enough points stored in the cache buffer to build a
   // spline, then intepolate
   if( cb->Spl() ) {
      if( E >= cb->Spl()->XMin() && E <= cb->Spl()->XMax())
      {
        double spl_maxdiffv = cb->Spl()->Evaluate(E);
        LOG("Kinematics", pINFO)
           << "\nInterpolated: max vmax(Q2)-vmin(Q2) (E=" << E << ") = " << spl_maxdiffv;
        return spl_maxdiffv;
      }
      LOG("Kinematics", pINFO)
           << "Outside spline boundaries - Forcing explicit calculation";
      return -1.;
   }
 
   // if there are not enough points at the cache buffer to have a spline,
   // look whether there is another point that is sufficiently close
   double dE = TMath::Min(0.25, 0.05*E);
   const map<double,double> & fmap = cb->Map();
   map<double,double>::const_iterator iter = fmap.lower_bound(E);
   if(iter != fmap.end())
   {
      if(TMath::Abs(E - iter->first) < dE) return iter->second;
   }
 
   return -1;
 
 }

double QELEventGeneratorSM::FindMaxXSec2 ( const Interaction * in ) const

private

Definition at line 574 of file QELEventGeneratorSM.cxx.

 {
 // Find a cached max xsec for the specified xsec algorithm & interaction and
 // close to the specified energy
 
   // get neutrino energy
   double E = this->Energy(interaction);
   LOG("Kinematics", pINFO) << "E = " << E;
 
   if(E < fEMin) {
      LOG("Kinematics", pINFO)
          << "Below minimum energy - Forcing explicit calculation";
      return -1.;
   }
 
   // access the the cache branch
   CacheBranchFx * cb = this->AccessCacheBranch2(interaction);
 
   // if there are enough points stored in the cache buffer to build a
   // spline, then intepolate
   if( cb->Spl() ) {
      if( E >= cb->Spl()->XMin() && E <= cb->Spl()->XMax()) {
        double spl_max_xsec = cb->Spl()->Evaluate(E);
        LOG("Kinematics", pINFO)
           << "\nInterpolated: max xsec (E=" << E << ") = " << spl_max_xsec;
        return spl_max_xsec;
      }
      LOG("Kinematics", pINFO)
           << "Outside spline boundaries - Forcing explicit calculation";
      return -1.;
   }
 
   // if there are not enough points at the cache buffer to have a spline,
   // look whether there is another point that is sufficiently close
   double dE = TMath::Min(0.25, 0.05*E);
   const map<double,double> & fmap = cb->Map();
   map<double,double>::const_iterator iter = fmap.lower_bound(E);
   if(iter != fmap.end()) {
      if(TMath::Abs(E - iter->first) < dE) return iter->second;
   }
 
   return -1;
 
 }

void QELEventGeneratorSM::LoadConfig ( void )

private

Definition at line 423 of file QELEventGeneratorSM.cxx.

 {
 
   // Safety factor for the maximum differential cross section
   GetParamDef( "MaxXSec-SafetyFactor", fSafetyFactor,   1.2) ;
   GetParamDef( "MaxDiffv-SafetyFactor",fSafetyFacor_nu, 1.2);
 
   // Minimum energy for which max xsec would be cached, forcing explicit
   // calculation for lower eneries
   GetParamDef( "Cache-MinEnergy", fEMin, 1.00) ;
   GetParamDef( "Threshold-Q2", fQ2Min, 2.00);
 
   // Maximum allowed fractional cross section deviation from maxim cross
   // section used in rejection method
   GetParamDef( "MaxXSec-DiffTolerance", fMaxXSecDiffTolerance, 999999.);
   assert(fMaxXSecDiffTolerance>=0);
 
   //-- Generate kinematics uniformly over allowed phase space and compute
   //   an event weight?
   GetParamDef( "UniformOverPhaseSpace", fGenerateUniformly, false);
 
   // Generate nucleon in nucleus?
   GetParamDef( "IsNucleonInNucleus", fGenerateNucleonInNucleus, true);
 
 
   sm_utils = const_cast<genie::SmithMonizUtils *>(dynamic_cast<const genie::SmithMonizUtils *>( this -> SubAlg("sm_utils_algo") ) ) ;
 }

double QELEventGeneratorSM::MaxDiffv ( GHepRecord * evrec ) const

private

Definition at line 687 of file QELEventGeneratorSM.cxx.

 {
   LOG("Kinematics", pINFO)
                 << "Getting max. vmax(Q2)-vmin(Q2) for the rejection method";
 
   double max_diffv = -1;
   Interaction * interaction = event_rec->Summary();
 
   LOG("Kinematics", pINFO)
                   << "Attempting to find a cached max{vmax(Q2)-vmin(Q2)} value";
   max_diffv = this->FindMaxDiffv(interaction);
   if(max_diffv>0) return max_diffv;
 
   LOG("Kinematics", pINFO)
                   << "Attempting to compute the max{vmax(Q2)-vmin(Q2)} value";
   max_diffv = this->ComputeMaxDiffv(interaction);
   if(max_diffv>0) {
      LOG("Kinematics", pINFO) << "max{vmax(Q2)-vmin(Q2)} = " << max_diffv;
      this->CacheMaxDiffv(interaction, max_diffv);
      return max_diffv;
   }
 
   LOG("Kinematics", pNOTICE)
             << "Can not generate event kinematics (max{vmax(Q2)-vmin(Q2);E}<=0)";
   // xsec for selected kinematics = 0
   event_rec->SetDiffXSec(0,kPSNull);
   // switch on error flag
   event_rec->EventFlags()->SetBitNumber(kKineGenErr, true);
   // reset 'trust' bits
   interaction->ResetBit(kISkipProcessChk);
   interaction->ResetBit(kISkipKinematicChk);
   // throw exception
   genie::exceptions::EVGThreadException exception;
   exception.SetReason("kinematics generation: max{vmax(Q2)-vmin(Q2);E}<=0");
   exception.SwitchOnFastForward();
   throw exception;
 
   return 0;
 }

double QELEventGeneratorSM::MaxXSec2 ( GHepRecord * evrec ) const

private

Definition at line 534 of file QELEventGeneratorSM.cxx.

 {
   LOG("Kinematics", pINFO)
                 << "Getting max. differential xsec for the rejection method";
 
   double xsec_max = -1;
   Interaction * interaction = event_rec->Summary();
 
   LOG("Kinematics", pINFO)
                   << "Attempting to find a cached max{dxsec/dK} value";
   xsec_max = this->FindMaxXSec2(interaction);
   if(xsec_max>0) return xsec_max;
 
   LOG("Kinematics", pINFO)
                   << "Attempting to compute the max{dxsec/dK} value";
   xsec_max = this->ComputeMaxXSec2(interaction);
   if(xsec_max>0) {
      LOG("Kinematics", pINFO) << "max{dxsec/dK} = " << xsec_max;
      this->CacheMaxXSec2(interaction, xsec_max);
      return xsec_max;
   }
 
   LOG("Kinematics", pNOTICE)
             << "Can not generate event kinematics {K} (max_xsec({K};E)<=0)";
   // xsec for selected kinematics = 0
   event_rec->SetDiffXSec(0,kPSNull);
   // switch on error flag
   event_rec->EventFlags()->SetBitNumber(kKineGenErr, true);
   // reset 'trust' bits
   interaction->ResetBit(kISkipProcessChk);
   interaction->ResetBit(kISkipKinematicChk);
   // throw exception
   genie::exceptions::EVGThreadException exception;
   exception.SetReason("kinematics generation: max_xsec({K};E)<=0");
   exception.SwitchOnFastForward();
   throw exception;
 
   return 0;
 }

void QELEventGeneratorSM::ProcessEventRecord ( GHepRecord * event_rec ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 80 of file QELEventGeneratorSM.cxx.

 {
   LOG("QELEvent", pINFO) << "Generating QE event kinematics...";
 
   if(fGenerateUniformly) {
     LOG("QELEvent", pNOTICE)
           << "Generating kinematics uniformly over the allowed phase space";
   }
 
   // Get the interaction and set the 'trust' bits
   Interaction * interaction = evrec->Summary();
   const InitialState & init_state = interaction -> InitState();
   interaction->SetBit(kISkipProcessChk);
   interaction->SetBit(kISkipKinematicChk);
 
   // Skip if no hit nucleon is set
   if(! evrec->HitNucleon())
   {
     LOG("QELEvent", pFATAL) << "No hit nucleon was set";
     gAbortingInErr = true;
     exit(1);
   }
 
   // Access the target from the interaction summary
   Target * tgt = init_state.TgtPtr();
   GHepParticle * nucleon = evrec->HitNucleon();
   // Store position of nucleon
   double hitNucPos = nucleon->X4()->Vect().Mag();
   tgt->SetHitNucPosition( hitNucPos );
 
   // Get the random number generators
   RandomGen * rnd = RandomGen::Instance();
 
   // Access cross section algorithm for running thread
   RunningThreadInfo * rtinfo = RunningThreadInfo::Instance();
   const EventGeneratorI * evg = rtinfo->RunningThread();
   fXSecModel = evg->CrossSectionAlg();
 
   // heavy nucleus is nucleus that heavier than hydrogen and deuterium
   bool isHeavyNucleus = tgt->A()>=3;
 
   sm_utils->SetInteraction(interaction);
   // phase space for heavy nucleus is different from light one
   fkps = isHeavyNucleus?kPSQ2vfE:kPSQ2fE;
   Range1D_t rQ2 = sm_utils->Q2QES_SM_lim();
   // Try to calculate the maximum cross-section in kinematical limits
   // if not pre-computed already
   double xsec_max1  = (fGenerateUniformly) ? -1 : this->MaxXSec(evrec);
   double xsec_max2  = (fGenerateUniformly) ? -1 : (rQ2.max<fQ2Min)? 0: this->MaxXSec2(evrec);// this make correct calculation of probability
   double vmax= isHeavyNucleus?this->MaxDiffv(evrec) : 0.;
 
 
   // generate Q2, v
   double gQ2, v, xsec;
   unsigned int iter = 0;
   bool accept = false;
   TLorentzVector q;
   while(1)
   {
      LOG("QELEvent", pINFO) << "Attempt #: " << iter;
      if(iter > kRjMaxIterations)
      {
         LOG("QELEvent", pWARN)
           << "Couldn't select a valid kinematics after " << iter << " iterations";
         evrec->EventFlags()->SetBitNumber(kKineGenErr, true);
         genie::exceptions::EVGThreadException exception;
         exception.SetReason("Couldn't select kinematics");
         exception.SwitchOnFastForward();
         throw exception;
      }
 
       // Pick Q2 and v
      double xsec_max = 0.;
      double pth = rnd->RndKine().Rndm();
      //pth < prob1/(prob1+prob2), where prob1,prob2 - probabilities to generate event in area1 (Q2<fQ2Min) and area2 (Q2>fQ2Min) which are not normalized
      if (pth <= xsec_max1*(TMath::Min(rQ2.max, fQ2Min)-rQ2.min)/(xsec_max1*(TMath::Min(rQ2.max, fQ2Min)-rQ2.min)+xsec_max2*(rQ2.max-fQ2Min)))
      {
        xsec_max = xsec_max1;
        gQ2 = (rnd->RndKine().Rndm() * (TMath::Min(rQ2.max, fQ2Min)-rQ2.min)) + rQ2.min;
      }
      else
      {
         xsec_max = xsec_max2;
         gQ2 = (rnd->RndKine().Rndm() * (rQ2.max-fQ2Min)) + fQ2Min;
      }
      Range1D_t rv  = sm_utils->vQES_SM_lim(gQ2);
      // for nuclei heavier than deuterium generate energy transfer in defined energy interval
      v = 0.;
      if (isHeavyNucleus)
      {
        v = vmax * rnd->RndKine().Rndm();
        if (v > (rv.max-rv.min))
        {
           continue;
        }
      }
      v += rv.min;
 
      Kinematics * kinematics = interaction->KinePtr();
      kinematics->SetKV(kKVQ2, gQ2);
      kinematics->SetKV(kKVv, v);
      xsec = fXSecModel->XSec(interaction, fkps);
 
       //-- Decide whether to accept the current kinematics
      if(!fGenerateUniformly)
      {
        this->AssertXSecLimits(interaction, xsec, xsec_max);
        double t = xsec_max * rnd->RndKine().Rndm();
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
        LOG("QELEvent", pDEBUG)<< "xsec= " << xsec << ", J= " << J << ", Rnd= " << t;
 #endif
        accept = (t < xsec);
      }
      else
      {
         accept = (xsec>0);
      }
 
      // If the generated kinematics are accepted, finish-up module's job
      if(accept)
      {
        interaction->ResetBit(kISkipProcessChk);
        interaction->ResetBit(kISkipKinematicChk);
        break;
      }
      iter++;
   }
 
   // Z-frame is frame where momentum transfer is (v,0,0,qv)
   double qv = TMath::Sqrt(v*v+gQ2);
   TLorentzVector transferMom(0, 0, qv, v);
 
   Range1D_t rkF = sm_utils->kFQES_SM_lim(gQ2, v);
   double kF = (rnd->RndKine().Rndm() * (rkF.max-rkF.min)) + rkF.min;
 
   // Momentum of initial neutrino in LAB frame
   TLorentzVector * tempTLV = evrec->Probe()->GetP4();
   TLorentzVector neutrinoMom = *tempTLV;
   delete tempTLV;
 
   // define all angles in Z frame
   double theta = neutrinoMom.Vect().Theta();
   double phi =   neutrinoMom.Vect().Phi();
   double theta_k = sm_utils-> GetTheta_k(v, qv);
   double costheta_k = TMath::Cos(theta_k);
   double sintheta_k = TMath::Sin(theta_k);
   double E_p; //energy of initial nucleon
   double theta_p = sm_utils-> GetTheta_p(kF, v, qv, E_p);
   double costheta_p = TMath::Cos(theta_p);
   double sintheta_p = TMath::Sin(theta_p);
   double fi_p       = 2 * TMath::Pi() * rnd->RndGen().Rndm();
   double cosfi_p    = TMath::Cos(fi_p);
   double sinfi_p    = TMath::Sin(fi_p);
   double psi       = 2 * TMath::Pi() * rnd->RndGen().Rndm();
 
   // 4-momentum of initial neutrino in Z-frame
   TLorentzVector neutrinoMomZ(neutrinoMom.P()*sintheta_k, 0, neutrinoMom.P()*costheta_k, neutrinoMom.E());
 
   // 4-momentum of final lepton in Z-frame
   TLorentzVector outLeptonMom = neutrinoMomZ-transferMom;
 
   // 4-momentum of initial nucleon in Z-frame
   TLorentzVector inNucleonMom(kF*sintheta_p*cosfi_p, kF*sintheta_p*sinfi_p, kF*costheta_p, E_p);
 
   // 4-momentum of final nucleon in Z-frame
   TLorentzVector outNucleonMom = inNucleonMom+transferMom;
 
 
   // Rotate all vectors from Z frame to LAB frame
   TVector3 yvec (0.0, 1.0, 0.0);
   TVector3 zvec (0.0, 0.0, 1.0);
   TVector3 unit_nudir = neutrinoMom.Vect().Unit();
 
   outLeptonMom.Rotate(theta-theta_k, yvec);
   outLeptonMom.Rotate(phi, zvec);
 
   inNucleonMom.Rotate(theta-theta_k, yvec);
   inNucleonMom.Rotate(phi, zvec);
 
   outNucleonMom.Rotate(theta-theta_k, yvec);
   outNucleonMom.Rotate(phi, zvec);
 
   outLeptonMom.Rotate(psi, unit_nudir);
   inNucleonMom.Rotate(psi, unit_nudir);
   outNucleonMom.Rotate(psi, unit_nudir);
 
   // set 4-momentum of struck nucleon
   TLorentzVector * p4 = tgt->HitNucP4Ptr();
   p4->SetPx( inNucleonMom.Px() );
   p4->SetPy( inNucleonMom.Py() );
   p4->SetPz( inNucleonMom.Pz() );
   p4->SetE ( inNucleonMom.E() );
 
   int rpdgc = interaction->RecoilNucleonPdg();
   assert(rpdgc);
   double gW = PDGLibrary::Instance()->Find(rpdgc)->Mass();
   LOG("QELEvent", pNOTICE) << "Selected: W = "<< gW;
   double M = init_state.Tgt().HitNucP4().M();
   double E  = init_state.ProbeE(kRfHitNucRest);
 
   // (W,Q2) -> (x,y)
   double gx=0, gy=0;
   kinematics::WQ2toXY(E,M,gW,gQ2,gx,gy);
 
   // lock selected kinematics & clear running values
   interaction->KinePtr()->SetQ2(gQ2, true);
   interaction->KinePtr()->SetW (gW,  true);
   interaction->KinePtr()->Setx (gx,  true);
   interaction->KinePtr()->Sety (gy,  true);
   interaction->KinePtr()->ClearRunningValues();
 
   // set the cross section for the selected kinematics
   evrec->SetDiffXSec(xsec,fkps);
   if(fGenerateUniformly)
   {
      double vol     = sm_utils->PhaseSpaceVolume(fkps);
      double totxsec = evrec->XSec();
      double wght    = (vol/totxsec)*xsec;
      LOG("QELEvent", pNOTICE)  << "Kinematics wght = "<< wght;
 
      // apply computed weight to the current event weight
      wght *= evrec->Weight();
      LOG("QELEvent", pNOTICE) << "Current event wght = " << wght;
      evrec->SetWeight(wght);
   }
   TLorentzVector x4l(*(evrec->Probe())->X4());
 
   // Add the final-state lepton to the event record
   evrec->AddParticle(interaction->FSPrimLeptonPdg(), kIStStableFinalState, evrec->ProbePosition(),-1,-1,-1, outLeptonMom, x4l);
 
   // Set its polarization
   utils::SetPrimaryLeptonPolarization( evrec );
 
   GHepStatus_t ist;
   if (!fGenerateNucleonInNucleus)
      ist = kIStStableFinalState;
   else
      ist = (tgt->IsNucleus()) ? kIStHadronInTheNucleus : kIStStableFinalState;
 
   GHepParticle outNucleon(interaction->RecoilNucleonPdg(), ist, evrec->HitNucleonPosition(),-1,-1,-1, outNucleonMom , x4l);
   evrec->AddParticle(outNucleon);
 
   // Store struck nucleon momentum
   LOG("QELEvent",pNOTICE) << "pn: " << inNucleonMom.X() << ", " <<inNucleonMom.Y() << ", " <<inNucleonMom.Z() << ", " <<inNucleonMom.E();
   nucleon->SetMomentum(inNucleonMom);
   nucleon->SetRemovalEnergy(sm_utils->GetBindingEnergy());
 
   // skip if not a nuclear target
   if(evrec->Summary()->InitState().Tgt().IsNucleus())
     // add a recoiled nucleus remnant
     this->AddTargetNucleusRemnant(evrec);
 
 
   LOG("QELEvent", pINFO) << "Done generating QE event kinematics!";
 }

Member Data Documentation

bool genie::QELEventGeneratorSM::fGenerateNucleonInNucleus

private

generate struck nucleon in nucleus

Definition at line 86 of file QELEventGeneratorSM.h.

KinePhaseSpace_t genie::QELEventGeneratorSM::fkps

mutableprivate

Definition at line 83 of file QELEventGeneratorSM.h.

double genie::QELEventGeneratorSM::fQ2Min

private

Q2-threshold for seeking the second maximum.

Definition at line 87 of file QELEventGeneratorSM.h.

double genie::QELEventGeneratorSM::fSafetyFacor_nu

private

Definition at line 89 of file QELEventGeneratorSM.h.

SmithMonizUtils* genie::QELEventGeneratorSM::sm_utils

mutableprivate

Definition at line 65 of file QELEventGeneratorSM.h.

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

Generator/src/Physics/QuasiElastic/EventGen/QELEventGeneratorSM.h
Generator/src/Physics/QuasiElastic/EventGen/QELEventGeneratorSM.cxx

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation