genie::SKKinematicsGenerator Class Reference

Generates values for the kinematic variables describing neutrino-nucleus single kaon production events. Is a concrete implementation of the EventRecordVisitorI interface. More...

#include <SKKinematicsGenerator.h>

Inheritance diagram for genie::SKKinematicsGenerator:

Collaboration diagram for genie::SKKinematicsGenerator:

Public Member Functions
	SKKinematicsGenerator ()
	SKKinematicsGenerator (string config)
	~SKKinematicsGenerator ()
void	ProcessEventRecord (GHepRecord *event_rec) const
void	Configure (const Registry &config)
void	Configure (string config)
void	LoadConfig (void)
void	CalculateKin_AtharSingleKaon (GHepRecord *event_rec) const
double	ComputeMaxXSec (const Interaction *in) const
double	Energy (const Interaction *in) 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.
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 Attributes
double	fMinLog1MinusCosTheta

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::KineGeneratorWithCache
	KineGeneratorWithCache ()
	KineGeneratorWithCache (string name)
	KineGeneratorWithCache (string name, string config)
	~KineGeneratorWithCache ()
virtual double	ComputeMaxXSec (const Interaction *in, const int nkey) const
virtual double	MaxXSec (GHepRecord *evrec, const int nkey=0) const
virtual double	FindMaxXSec (const Interaction *in, const int nkey=0) const
virtual void	CacheMaxXSec (const Interaction *in, double xsec, const int nkey=0) const
virtual CacheBranchFx *	AccessCacheBranch (const Interaction *in, const int nkey=0) 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.
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::KineGeneratorWithCache
const XSecAlgorithmI *	fXSecModel
double	fSafetyFactor
	ComputeMaxXSec -> ComputeMaxXSec * fSafetyFactor.
std::vector< double >	vSafetyFactors
	MaxXSec -> MaxXSec * fSafetyFactors[nkey].
int	fNumOfSafetyFactors
	Number of given safety factors.
std::vector< string >	vInterpolatorTypes
	Type of interpolator for each key in a branch.
int	fNumOfInterpolatorTypes
	Number of given interpolators types.
double	fMaxXSecDiffTolerance
	max{100*(xsec-maxxsec)/.5*(xsec+maxxsec)} if xsec>maxxsec
double	fEMin
	min E for which maxxsec is cached - forcing explicit calc.
bool	fGenerateUniformly
	uniform over allowed phase space + event weight?
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

Generates values for the kinematic variables describing neutrino-nucleus single kaon production events. Is a concrete implementation of the EventRecordVisitorI interface.

Author

Chris Marshall <marshall \at pas.rochester.edu> University of Rochester

Created:\n October 03, 2014

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 28 of file SKKinematicsGenerator.h.

Constructor & Destructor Documentation

SKKinematicsGenerator() [1/2]

SKKinematicsGenerator::SKKinematicsGenerator

(

)

Definition at line 42 of file SKKinematicsGenerator.cxx.

                                             :
KineGeneratorWithCache("genie::SKKinematicsGenerator")
{
  //fEnvelope = 0;
}

References genie::KineGeneratorWithCache::KineGeneratorWithCache().

SKKinematicsGenerator() [2/2]

SKKinematicsGenerator::SKKinematicsGenerator

(

string

config

)

Definition at line 48 of file SKKinematicsGenerator.cxx.

                                                          :
KineGeneratorWithCache("genie::SKKinematicsGenerator", config)
{
  //fEnvelope = 0;
}

References genie::KineGeneratorWithCache::KineGeneratorWithCache().

~SKKinematicsGenerator()

SKKinematicsGenerator::~SKKinematicsGenerator

(

)

Definition at line 54 of file SKKinematicsGenerator.cxx.

{
  //if(fEnvelope) delete fEnvelope;
}

Member Function Documentation

CalculateKin_AtharSingleKaon()

void SKKinematicsGenerator::CalculateKin_AtharSingleKaon

(

GHepRecord *

event_rec

)

const

Definition at line 73 of file SKKinematicsGenerator.cxx.

{
  // Get the Primary Interacton object
  Interaction * interaction = evrec->Summary();
  interaction->SetBit(kISkipProcessChk);
  interaction->SetBit(kISkipKinematicChk);
 
  // Initialise a random number generator
  RandomGen * rnd = RandomGen::Instance();
 
  //-- For the subsequent kinematic selection with the rejection method:
  //   Calculate the max differential cross section or retrieve it from the
  //   cache. Throw an exception and quit the evg thread if a non-positive
  //   value is found.
  //   If the kinematics are generated uniformly over the allowed phase
  //   space the max xsec is irrelevant
  double xsec_max = (fGenerateUniformly) ? -1 : this->MaxXSec(evrec);
 
  // Determine lepton and kaon masses
  int leppdg = interaction->FSPrimLeptonPdg();
  const TLorentzVector pnuc4 = interaction->InitState().Tgt().HitNucP4(); // 4-momentum of struck nucleon in lab frame
  TVector3 beta = pnuc4.BoostVector();
  TLorentzVector P4_nu = *(interaction->InitStatePtr()->GetProbeP4(kRfHitNucRest)); // struck nucleon rest frame
 
  double enu = P4_nu.E(); // in nucleon rest frame
  int kaon_pdgc = interaction->ExclTag().StrangeHadronPdg();
  double mk = PDGLibrary::Instance()->Find(kaon_pdgc)->Mass();
  double ml = PDGLibrary::Instance()->Find(leppdg)->Mass();
 
  // Maximum possible kinetic energy
  const double Tkmax = enu - mk - ml;
  const double Tlmax = enu - mk - ml;
 
  // Tkmax <= 0 means we are below threshold for sure
  if( Tkmax <= 0.0 ) {
    LOG("SKKinematics", pWARN) << "No available phase space";
    evrec->EventFlags()->SetBitNumber(kKineGenErr, true);
    genie::exceptions::EVGThreadException exception;
    exception.SetReason("No available phase space");
    exception.SwitchOnFastForward();
    throw exception;
  }
 
  const double Tkmin = 0.0;
  const double Tlmin = 0.0;
  // for performance, use log( 1 - cos(theta_lepton) ) instead of cos(theta_lepton) because it is sharply peaked near 1.0
  const double xmin = fMinLog1MinusCosTheta; // set in LoadConfig
  const double xmax =  0.69314718056; // log(2) is physical boundary
  const double phikqmin = 0.0;
  const double phikqmax = 2.0 * kPi;
  const double dtk = Tkmax - Tkmin;
  const double dtl = Tlmax - Tlmin;
  const double dx = xmax - xmin;
  const double dphikq = phikqmax - phikqmin;
 
  //------ Try to select a valid tk, tl, costhetal, phikq quadruplet
 
  unsigned int iter = 0;
  bool accept = false;
  double xsec      = -1; // diff XS
  double tk        = -1; // kaon kinetic energy
  double tl        = -1; // lepton kinetic energy
  double costhetal = -1; // cosine of lepton angle
  double phikq     = -1; // azimuthal angle between kaon and q vector
 
  while(1) {
     iter++;
     if(iter > kRjMaxIterations) {
        LOG("SKKinematics", pWARN)
             << "*** Could not select a valid (tk, tl, costhetal) triplet after "
                                               << iter << " iterations";
        evrec->EventFlags()->SetBitNumber(kKineGenErr, true);
        genie::exceptions::EVGThreadException exception;
        exception.SetReason("Couldn't select kinematics");
        exception.SwitchOnFastForward();
        throw exception;
     }
 
     if(fGenerateUniformly) {
       tk = Tkmin + dtk * rnd->RndKine().Rndm();
       tl = Tlmin + dtl * rnd->RndKine().Rndm();
       double x = xmin + dx * rnd->RndKine().Rndm(); // log(1-costheta)
       costhetal = 1.0 - TMath::Exp(x);
       phikq = phikqmin + dphikq * rnd->RndKine().Rndm();
     } else {
       tk = Tkmin + dtk * rnd->RndKine().Rndm();
       tl = Tlmin + dtl * rnd->RndKine().Rndm();
       double x = xmin + dx * rnd->RndKine().Rndm(); // log(1-costheta)
       costhetal = 1.0 - TMath::Exp(x);
       phikq = phikqmin + dphikq * rnd->RndKine().Rndm();
     }
 
     LOG("SKKinematics", pDEBUG) << "Trying: Tk = " << tk << ", Tl = " << tl << ", cosThetal = " << costhetal << ", phikq = " << phikq;
 
     // nucleon rest frame! these need to be boosted to the lab frame before they become actual particles
     interaction->KinePtr()->SetKV(kKVTk, tk);
     interaction->KinePtr()->SetKV(kKVTl, tl);
     interaction->KinePtr()->SetKV(kKVctl, costhetal);
     interaction->KinePtr()->SetKV(kKVphikq, phikq);
 
     // lorentz invariant stuff, but do all the calculations in the nucleon rest frame
     double el = tl + ml;
     double pl = TMath::Sqrt(el*el - ml*ml);
     double M = interaction->InitState().Tgt().Mass();
     TVector3 lepton_3vector = TVector3(0,0,0);
     lepton_3vector.SetMagThetaPhi(pl,TMath::ACos(costhetal),0.0);
     TLorentzVector P4_lep( lepton_3vector, tl+ml );
     TLorentzVector q = P4_nu - P4_lep;
     double Q2 = -q.Mag2();
     double xbj = Q2/(2*M*q.E());
     double y = q.E()/P4_nu.E();
     double W2 = (pnuc4+q).Mag2();
 
 
     // computing cross section for the current kinematics
     xsec = fXSecModel->XSec(interaction, kPSTkTlctl);
 
     //-- decide whether to accept the current kinematics
     if(!fGenerateUniformly) {
        // Jacobian is 1-costheta for x = log(1-costheta)
        double max = xsec_max;
        double t   = max * rnd->RndKine().Rndm();
        double J   = TMath::Abs(1. - costhetal);
 
        this->AssertXSecLimits(interaction, xsec*J, max);
 
        if( xsec*J > xsec_max ) { // freak out if this happens
          LOG("SKKinematics", pWARN)
             << "!!!!!!XSEC ABOVE MAX!!!!! xsec= " << xsec << ", J= " << J << ", xsec*J = " << xsec*J << " max= " << xsec_max;
        }
 
        accept = (t< J*xsec);
     }
     else {
        accept = (xsec>0);
     }
 
     //-- If the generated kinematics are accepted, finish-up module's job
     if(accept) {
 
        // calculate the stuff
 
        // for uniform kinematics, compute an event weight as
        // wght = (phase space volume)*(differential xsec)/(event total xsec)
        if(fGenerateUniformly) {
          double wght = 1.0; // change this
          wght *= evrec->Weight();
          LOG("SKKinematics", pNOTICE) << "Current event wght = " << wght;
          evrec->SetWeight(wght);
        }
        LOG("SKKinematics", pWARN) << "\nLepton energy (rest frame) = " << el << " kaon = " << tl + mk;
 
        // reset bits
        interaction->ResetBit(kISkipProcessChk);
        interaction->ResetBit(kISkipKinematicChk);
 
        interaction->KinePtr()->SetKV(kKVSelTk, tk); // nucleon rest frame
        interaction->KinePtr()->SetKV(kKVSelTl, tl); // nucleon rest frame
        interaction->KinePtr()->SetKV(kKVSelctl, costhetal); // nucleon rest frame
        interaction->KinePtr()->SetKV(kKVSelphikq, phikq); // nucleon rest frame
        interaction->KinePtr()->SetQ2(Q2, true);
        interaction->KinePtr()->SetW(TMath::Sqrt(W2), true);
        interaction->KinePtr()->Setx( xbj, true );
        interaction->KinePtr()->Sety( y, true );
        interaction->KinePtr()->ClearRunningValues();
 
        // set the cross section for the selected kinematics
        evrec->SetDiffXSec(xsec*(1.0-costhetal),kPSTkTlctl); // phase space is really log(1-costheta)
 
        return;
     }
  }// iterations
}

References genie::KineGeneratorWithCache::AssertXSecLimits(), genie::Kinematics::ClearRunningValues(), genie::GHepRecord::EventFlags(), genie::Interaction::ExclTag(), genie::KineGeneratorWithCache::fGenerateUniformly, genie::PDGLibrary::Find(), fMinLog1MinusCosTheta, genie::Interaction::FSPrimLeptonPdg(), genie::KineGeneratorWithCache::fXSecModel, genie::Target::HitNucP4(), genie::Interaction::InitState(), genie::Interaction::InitStatePtr(), genie::PDGLibrary::Instance(), genie::RandomGen::Instance(), genie::Interaction::KinePtr(), genie::kISkipKinematicChk, genie::kISkipProcessChk, genie::kKineGenErr, genie::kKVctl, genie::kKVphikq, genie::kKVSelctl, genie::kKVSelphikq, genie::kKVSelTk, genie::kKVSelTl, genie::kKVTk, genie::kKVTl, genie::constants::kPi, genie::kPSTkTlctl, genie::kRfHitNucRest, genie::controls::kRjMaxIterations, LOG, genie::Target::Mass(), genie::KineGeneratorWithCache::MaxXSec(), pDEBUG, pNOTICE, pWARN, genie::RandomGen::RndKine(), genie::GHepRecord::SetDiffXSec(), genie::Kinematics::SetKV(), genie::Kinematics::SetQ2(), genie::exceptions::EVGThreadException::SetReason(), genie::Kinematics::SetW(), genie::GHepRecord::SetWeight(), genie::Kinematics::Setx(), genie::Kinematics::Sety(), genie::XclsTag::StrangeHadronPdg(), genie::GHepRecord::Summary(), genie::exceptions::EVGThreadException::SwitchOnFastForward(), genie::InitialState::Tgt(), and genie::GHepRecord::Weight().

Referenced by ProcessEventRecord().

ComputeMaxXSec()

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

virtual

Implements genie::KineGeneratorWithCache.

Definition at line 247 of file SKKinematicsGenerator.cxx.

{
// Computes the maximum differential cross section in the requested phase
// space. This method overloads KineGeneratorWithCache::ComputeMaxXSec
// method and the value is cached at a circular cache branch for retrieval
// during subsequent event generation.
 
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  SLOG("SKKinematics", pDEBUG)
          << "Scanning the allowed phase space {K} for the max(dxsec/d{K})";
#endif
 
  double max_xsec = 0;
  double max_tk = -1;
  double max_tl = -1;
  double max_ctl = -1;
 
  const int Ntk = 100;
  const int Ntl = 100;
  const int Nctl = 100;
  // don't do phi_kq -- the maximum will always occur at phi_kq = pi
 
  int leppdg = in->FSPrimLeptonPdg();
  double enu = in->InitState().ProbeE(kRfHitNucRest); // Enu in nucleon rest frame
  int kaon_pdgc = in->ExclTag().StrangeHadronPdg();
  double mk = PDGLibrary::Instance()->Find(kaon_pdgc)->Mass();
  double ml = PDGLibrary::Instance()->Find(leppdg)->Mass();
 
  const double Tkmax = enu - mk - ml;
  const double Tlmax = enu - mk - ml;
  const double Tkmin = 0.0;
  const double Tlmin = 0.0;
  // cross section is sharply peaked at forward lepton
  // faster to scan over log(1 - cos(theta)) = x
  const double xmin = fMinLog1MinusCosTheta; // set in LoadConfig
  const double xmax =  0.69314718056; // physical limit -- this is log(2)
  const double dtk = (Tkmax - Tkmin)/Ntk;
  const double dtl = (Tlmax - Tlmin)/Ntl;
  const double dx = (xmax - xmin)/Nctl;
 
  // XS is 0 when the kinetic energies are == 0, so start at 1
  for(int i = 1; i < Ntk; i++) {
    double tk = Tkmin + dtk*i;
    for(int j = 1; j < Ntl; j++) {
      double tl = Tlmin + dtl*j;
      for(int k = 0; k < Nctl; k++) {
        double log_1_minus_cosine_theta_lepton = xmin + dx*k;
        // XS takes cos(theta_lepton), we are scanning over log(1-that) to save time, convert to cos(theta_lepton) here
        double ctl = 1.0 - TMath::Exp(log_1_minus_cosine_theta_lepton);
 
        // The cross section is 4D, but the maximum differential cross section always occurs at phi_kq = pi (or -pi)
        // this is because there is more phase space for the kaon when it is opposite the lepton
        // to save time in this loop, just set phi_kq to pi
        double phikq = kPi;
 
        in->KinePtr()->SetKV(kKVTk, tk);
        in->KinePtr()->SetKV(kKVTl, tl);
        in->KinePtr()->SetKV(kKVctl, ctl);
        in->KinePtr()->SetKV(kKVphikq, phikq);
 
        double xsec = fXSecModel->XSec(in, kPSTkTlctl);
 
        // xsec returned by model is d4sigma/(dtk dtl dcosthetal dphikq)
        // convert lepton theta to log(1-costheta) by multiplying by jacobian 1 - costheta
        xsec *= (1.0 - ctl);
 
        if( xsec > max_xsec ) {
          max_xsec = xsec;
          max_tk = tk;
          max_tl = tl;
          max_ctl = ctl;
        }
      }//ctl
    }//tl
  }//tk
 
  LOG("SKKinematics", pINFO) << "Max XSec is " << max_xsec << " for enu = " << enu << " tk = " << max_tk << " tl = " << max_tl << " cosine theta = " << max_ctl;
 
  // Apply safety factor, since value retrieved from the cache might
  // correspond to a slightly different energy.
  max_xsec *= fSafetyFactor;
 
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  SLOG("SKKinematics", pDEBUG) << in->AsString();
  SLOG("SKKinematics", pDEBUG) << "Max xsec in phase space = " << max_xsec;
  SLOG("SKKinematics", pDEBUG) << "Computed using alg = " << fXSecModel->Id();
#endif
 
 
 
  return max_xsec;
}

References genie::Interaction::AsString(), genie::Interaction::ExclTag(), genie::PDGLibrary::Find(), fMinLog1MinusCosTheta, genie::KineGeneratorWithCache::fSafetyFactor, genie::Interaction::FSPrimLeptonPdg(), genie::KineGeneratorWithCache::fXSecModel, genie::Interaction::InitState(), genie::PDGLibrary::Instance(), genie::Interaction::KinePtr(), genie::kKVctl, genie::kKVphikq, genie::kKVTk, genie::kKVTl, genie::constants::kPi, genie::kPSTkTlctl, genie::kRfHitNucRest, LOG, pDEBUG, pINFO, genie::InitialState::ProbeE(), genie::Kinematics::SetKV(), SLOG, and genie::XclsTag::StrangeHadronPdg().

Configure() [1/2]

void SKKinematicsGenerator::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 351 of file SKKinematicsGenerator.cxx.

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

References genie::Algorithm::Configure(), and LoadConfig().

Configure() [2/2]

void SKKinematicsGenerator::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 357 of file SKKinematicsGenerator.cxx.

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

References genie::Algorithm::Configure(), and LoadConfig().

Energy()

double SKKinematicsGenerator::Energy ( const Interaction * in ) const

virtual

Reimplemented from genie::KineGeneratorWithCache.

Definition at line 341 of file SKKinematicsGenerator.cxx.

{
// Override the base class Energy() method to cache the max xsec for the
// neutrino energy in the LAB rather than in the hit nucleon rest frame.
 
  const InitialState & init_state = interaction->InitState();
  double E = init_state.ProbeE(kRfLab);
  return E;
}

References genie::Interaction::InitState(), genie::kRfLab, and genie::InitialState::ProbeE().

LoadConfig()

void SKKinematicsGenerator::LoadConfig

(

void

)

Definition at line 363 of file SKKinematicsGenerator.cxx.

{
  // max xsec safety factor (for rejection method) and min cached energy
  this->GetParamDef("MaxXSec-SafetyFactor", fSafetyFactor, 1.5);
  this->GetParamDef("Cache-MinEnergy",      fEMin,         0.6);
 
  // Generate kinematics uniformly over allowed phase space and compute
  // an event weight?
  this->GetParamDef("UniformOverPhaseSpace", fGenerateUniformly, false);
 
  // Maximum allowed fractional cross section deviation from maxim cross
  // section used in rejection method
  this->GetParamDef("MaxXSec-DiffTolerance", fMaxXSecDiffTolerance, 999999.);
  assert(fMaxXSecDiffTolerance>=0);
 
  //
  this->GetParamDef("MaxXSec-MinLog1MinusCosTheta", fMinLog1MinusCosTheta, -20.0);
}

References genie::KineGeneratorWithCache::fEMin, genie::KineGeneratorWithCache::fGenerateUniformly, genie::KineGeneratorWithCache::fMaxXSecDiffTolerance, fMinLog1MinusCosTheta, genie::KineGeneratorWithCache::fSafetyFactor, and genie::Algorithm::GetParamDef().

Referenced by Configure(), and Configure().

ProcessEventRecord()

void SKKinematicsGenerator::ProcessEventRecord ( GHepRecord * event_rec ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 59 of file SKKinematicsGenerator.cxx.

{
  if(fGenerateUniformly) {
    LOG("SKKinematics", pNOTICE)
          << "Generating kinematics uniformly over the allowed phase space";
  }
 
  //-- Access cross section algorithm for running thread
  RunningThreadInfo * rtinfo = RunningThreadInfo::Instance();
  const EventGeneratorI * evg = rtinfo->RunningThread();
  fXSecModel = evg->CrossSectionAlg();
  CalculateKin_AtharSingleKaon(evrec);
}

References CalculateKin_AtharSingleKaon(), genie::EventGeneratorI::CrossSectionAlg(), genie::KineGeneratorWithCache::fGenerateUniformly, genie::KineGeneratorWithCache::fXSecModel, genie::RunningThreadInfo::Instance(), LOG, pNOTICE, and genie::RunningThreadInfo::RunningThread().

Member Data Documentation

fMinLog1MinusCosTheta

double genie::SKKinematicsGenerator::fMinLog1MinusCosTheta

private

Definition at line 58 of file SKKinematicsGenerator.h.

Referenced by CalculateKin_AtharSingleKaon(), ComputeMaxXSec(), and LoadConfig().

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

• SKKinematicsGenerator.h
• SKKinematicsGenerator.cxx