Computes the QEL Charm Production Differential Cross Section using Kovalenko's duality model approach. It models the differential cross sections for:
. More...

#include <KovalenkoQELCharmPXSec.h>

Inheritance diagram for genie::KovalenkoQELCharmPXSec:

Public Member Functions
	KovalenkoQELCharmPXSec ()

	KovalenkoQELCharmPXSec (string config)

virtual	~KovalenkoQELCharmPXSec ()

double	XSec (const Interaction *i, KinePhaseSpace_t k) const
	Compute the cross section for the input interaction. More...

double	Integral (const Interaction *i) const

bool	ValidProcess (const Interaction *i) const
	Can this cross section algorithm handle the input process? More...

bool	ValidKinematics (const Interaction *i) const
	Is the input kinematical point a physically allowed one? More...

void	Configure (const Registry &config)

void	Configure (string param_set)

Public Member Functions inherited from genie::XSecAlgorithmI
virtual	~XSecAlgorithmI ()

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	ZR (const Interaction *interaction) const

double	DR (const Interaction *interaction) const

double	MRes (const Interaction *interaction) const

double	ResDM (const Interaction *interaction) const

double	xiBar (double Q2, double Mnuc, double v) const

Private Attributes
const PDFModelI *	fPDFModel

const XSecIntegratorI *	fXSecIntegrator
	const IntegratorI * fIntegrator; More...

double	fMo

double	fScLambdaP

double	fScSigmaP

double	fScSigmaPP

double	fResDMLambda

double	fResDMSigma

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::XSecAlgorithmI
	XSecAlgorithmI ()

	XSecAlgorithmI (string name)

	XSecAlgorithmI (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::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

Computes the QEL Charm Production Differential Cross Section using Kovalenko's duality model approach. It models the differential cross sections for:
.

v + n mu- + Lambda_{c}^{+} (2285)
v + n mu- + Sigma_{c}^{+} (2455)
v + p mu- + Sigma_{c}^{++} (2455) Is a concrete implementation of the XSecAlgorithmI interface.

S.G.Kovalenko, Sov.J.Nucl.Phys.52:934 (1990)

      Rather than using Kovalenko's expression for the ZR scaling factor,
      I apply an ad-hoc scaling factor maintaining the relative strength
      of the QELC channels but lowering their sum to be consistent with
      recent NOMAD measurement. The default value of M0 has been changed
      from 0.1 to sqrt(0.1) as in M.Bischofberger's (ETHZ)PhD thesis
      (DISS.ETH NO 16034). For more details see GENIE-PUB/2007/006.

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

June 10, 2004

Definition at line 48 of file KovalenkoQELCharmPXSec.h.

Constructor & Destructor Documentation

KovalenkoQELCharmPXSec::KovalenkoQELCharmPXSec ( )

Definition at line 36 of file KovalenkoQELCharmPXSec.cxx.

                                                :
 XSecAlgorithmI("genie::KovalenkoQELCharmPXSec")
 {
 
 }

KovalenkoQELCharmPXSec::KovalenkoQELCharmPXSec ( string config )

Definition at line 42 of file KovalenkoQELCharmPXSec.cxx.

                                                             :
 XSecAlgorithmI("genie::KovalenkoQELCharmPXSec", config)
 {
 
 }

KovalenkoQELCharmPXSec::~KovalenkoQELCharmPXSec ( )

virtual

Definition at line 48 of file KovalenkoQELCharmPXSec.cxx.

 {
 
 }

Member Function Documentation

void KovalenkoQELCharmPXSec::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 289 of file KovalenkoQELCharmPXSec.cxx.

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

void KovalenkoQELCharmPXSec::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 295 of file KovalenkoQELCharmPXSec.cxx.

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

double KovalenkoQELCharmPXSec::DR ( const Interaction * interaction ) const

private

Definition at line 141 of file KovalenkoQELCharmPXSec.cxx.

 {
   const InitialState & init_state = interaction -> InitState();
 
   // Compute PDFs
   PDF pdfs;
   pdfs.SetModel(fPDFModel);   // <-- attach algorithm
 
   // Compute integration area = [xi_bar_plus, xi_bar_minus]
   const Kinematics & kinematics = interaction->Kine();
 
   double Q2     = kinematics.Q2();
   double Mnuc   = init_state.Tgt().HitNucMass();
   double Mnuc2  = TMath::Power(Mnuc,2);
   double MR     = this->MRes(interaction);
   double DeltaR = this->ResDM(interaction);
 
   double vR_minus  = ( TMath::Power(MR-DeltaR,2) - Mnuc2 + Q2 ) / (2*Mnuc);
   double vR_plus   = ( TMath::Power(MR+DeltaR,2) - Mnuc2 + Q2 ) / (2*Mnuc);
 
   LOG("QELCharmXSec", pDEBUG)
     << "vR = [plus: " << vR_plus << ", minus: " << vR_minus << "]";
 
   double xi_bar_minus  = 0.999;
   double xi_bar_plus  = this->xiBar(Q2, Mnuc, vR_plus);
 
   LOG("QELCharmXSec", pDEBUG)
     << "Integration limits = [" << xi_bar_plus << ", " << xi_bar_minus << "]";
 
   int pdgc = init_state.Tgt().HitNucPdg();
 
   ROOT::Math::IBaseFunctionOneDim * integrand = new
           utils::gsl::wrap::KovQELCharmIntegrand(&pdfs,Q2,pdgc);
   ROOT::Math::IntegrationOneDim::Type ig_type =
           utils::gsl::Integration1DimTypeFromString("adaptive");
 
   double abstol   = 1;    // We mostly care about relative tolerance
   double reltol   = 1E-4;
   int    nmaxeval = 100000;
   ROOT::Math::Integrator ig(*integrand,ig_type,abstol,reltol,nmaxeval);
   double D = ig.Integral(xi_bar_plus, xi_bar_minus);
 
   delete integrand;
 
   return D;
 }

double KovalenkoQELCharmPXSec::Integral ( const Interaction * i ) const

virtual

Integrate the model over the kinematic phase space available to the input interaction (kinematical cuts can be included)

Implements genie::XSecAlgorithmI.

Definition at line 228 of file KovalenkoQELCharmPXSec.cxx.

 {
   double xsec = fXSecIntegrator->Integrate(this,interaction);
   return xsec;
 }

void KovalenkoQELCharmPXSec::LoadConfig ( void )

private

fIntegrator = 0;

Definition at line 301 of file KovalenkoQELCharmPXSec.cxx.

 {
   fPDFModel   = 0;
   ///fIntegrator = 0;
 
   // Get config values or set defaults
   GetParamDef( "Scale-LambdaP", fScLambdaP,  0.8 * 0.0102 ) ;
   GetParamDef( "Scale-SigmaP",  fScSigmaP ,  0.8 * 0.0028 ) ;
   GetParamDef( "Scale-SigmaPP", fScSigmaPP,  0.8 * 0.0159 ) ;
   GetParamDef( "Res-DeltaM-Lambda", fResDMLambda,  0.56 ) ;      //GeV
   GetParamDef( "Res-DeltaM-Sigma",  fResDMSigma,   0.20 ) ;      //GeV
   GetParamDef( "Mo",                fMo,           sqrt(0.1) );  //GeV
 
   // get PDF model and integrator
 
   fPDFModel = dynamic_cast<const PDFModelI *>(this->SubAlg("PDF-Set"));
   assert(fPDFModel);
 
   // load XSec Integrator
   fXSecIntegrator =
       dynamic_cast<const XSecIntegratorI *> (this->SubAlg("XSec-Integrator"));
   assert(fXSecIntegrator);
 
   // load numerical integrator for integrand in diff x-section calc.
 //  fIntegrator = dynamic_cast<const IntegratorI *>(this->SubAlg("Integrator"));
 //  assert(fIntegrator);
 }

double KovalenkoQELCharmPXSec::MRes ( const Interaction * interaction ) const

private

Definition at line 219 of file KovalenkoQELCharmPXSec.cxx.

 {
   const XclsTag & xcls = interaction->ExclTag();
 
   int pdgc  = xcls.CharmHadronPdg();
   double MR = PDGLibrary::Instance()->Find(pdgc)->Mass();
   return MR;
 }

double KovalenkoQELCharmPXSec::ResDM ( const Interaction * interaction ) const

private

Definition at line 197 of file KovalenkoQELCharmPXSec.cxx.

 {
 // Resonance Delta M obeys the constraint DM(R+/-) <= |M(R+/-) - M(R)|
 // where M(R-) <= M(R) <= M(R+) are the masses of the neighboring
 // resonances R+, R-.
 // Get the values from the algorithm conf. registry, and if they do not exist
 // set them to default values (Eq.(20) in Sov.J.Nucl.Phys.52:934 (1990)
 
   const XclsTag & xcls = interaction->ExclTag();
 
   int pdgc = xcls.CharmHadronPdg();
 
   bool isLambda = (pdgc == kPdgLambdaPc);
   bool isSigma  = (pdgc == kPdgSigmaPc || pdgc == kPdgSigmaPPc);
 
   if      ( isLambda ) return fResDMLambda;
   else if ( isSigma  ) return fResDMSigma;
   else                 abort();
 
   return 0;
 }

bool KovalenkoQELCharmPXSec::ValidKinematics ( const Interaction * i ) const

virtual

Is the input kinematical point a physically allowed one?

Reimplemented from genie::XSecAlgorithmI.

Definition at line 267 of file KovalenkoQELCharmPXSec.cxx.

 {
   if(interaction->TestBit(kISkipKinematicChk)) return true;
 
   const InitialState & init_state  = interaction->InitState();
   double E = init_state.ProbeE(kRfHitNucRest);
 
   //resonance, final state primary lepton & nucleon mass
   double MR    = this -> MRes  (interaction);
   double ml    = interaction->FSPrimLepton()->Mass();
   double Mnuc  = init_state.Tgt().HitNucP4Ptr()->M();
   double Mnuc2 = TMath::Power(Mnuc,2);
 
   //resonance threshold
   double ER = ( TMath::Power(MR+ml,2) - Mnuc2 ) / (2*Mnuc);
 
   if(E <= ER) return false;
 
   return true;
 }

bool KovalenkoQELCharmPXSec::ValidProcess ( const Interaction * i ) const

virtual

Can this cross section algorithm handle the input process?

Implements genie::XSecAlgorithmI.

Definition at line 234 of file KovalenkoQELCharmPXSec.cxx.

 {
   // Make sure we are dealing with one of the following channels:
   // v + n --> mu- + Lambda_{c}^{+} (2285)
   // v + n --> mu- + Sigma_{c}^{+} (2455)
   // v + p --> mu- + Sigma_{c}^{++} (2455)
 
   if(interaction->TestBit(kISkipProcessChk)) return true;
 
   const XclsTag &      xcls       = interaction->ExclTag();
   const InitialState & init_state = interaction->InitState();
   const ProcessInfo &  proc_info  = interaction->ProcInfo();
 
   bool is_exclusive_charm = (xcls.IsCharmEvent() && !xcls.IsInclusiveCharm());
   if(!is_exclusive_charm) return false;
 
   if(!proc_info.IsQuasiElastic()) return false;
   if(!proc_info.IsWeak())         return false;
 
   bool isP = pdg::IsProton ( init_state.Tgt().HitNucPdg() );
   bool isN = pdg::IsNeutron( init_state.Tgt().HitNucPdg() );
 
   int pdgc = xcls.CharmHadronPdg();
 
   bool can_handle = (
      (pdgc == kPdgLambdaPc && isN) || /* v + n -> l + #Lambda_{c}^{+} */
      (pdgc == kPdgSigmaPc  && isN) || /* v + n -> l + #Sigma_{c}^{+}  */
      (pdgc == kPdgSigmaPPc && isP)    /* v + p -> l + #Sigma_{c}^{++} */
   );
   return can_handle;
 }

double KovalenkoQELCharmPXSec::xiBar	(	double	Q2,
		double	Mnuc,
		double	v
	)		const

private

Definition at line 188 of file KovalenkoQELCharmPXSec.cxx.

 {
   double Mo2 = fMo*fMo;
   double v2  = v *v;
   double xi  = (Q2/Mnuc) / (v + TMath::Sqrt(v2+Q2));
   double xib = xi * ( 1 + (1 + Mo2/(Q2+Mo2))*Mo2/Q2 );
   return xib;
 }

double KovalenkoQELCharmPXSec::XSec	(	const Interaction *	i,
		KinePhaseSpace_t	k
	)		const

virtual

Compute the cross section for the input interaction.

Implements genie::XSecAlgorithmI.

Definition at line 53 of file KovalenkoQELCharmPXSec.cxx.

 {
   if(! this -> ValidProcess    (interaction) ) return 0.;
   if(! this -> ValidKinematics (interaction) ) return 0.;
 
   //----- get kinematics & init state - compute auxiliary vars
   const Kinematics &   kinematics  = interaction->Kine();
   const InitialState & init_state  = interaction->InitState();
   const Target &       target      = init_state.Tgt();
 
   //neutrino energy & momentum transfer
   double E   = init_state.ProbeE(kRfHitNucRest);
   double E2  = E * E;
   double Q2  = kinematics.Q2();
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("QELCharmXSec", pDEBUG) << "E = " << E << ", Q2 = " << Q2;
 #endif
 
   //resonance mass & nucleon mass
   double MR    = this->MRes  (interaction);
   double MR2   = TMath::Power(MR,2);
   double Mnuc  = target.HitNucMass();
   double Mnuc2 = TMath::Power(Mnuc,2);
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("QELCharmXSec", pDEBUG) << "M(RES) = " << MR;
 #endif
 
   //----- Calculate the differential cross section dxsec/dQ^2
   double Gf        = kGF2 / (2*kPi);
   double vR        = (MR2 - Mnuc2 + Q2) / (2*Mnuc);
   double xiR       = this->xiBar(Q2, Mnuc, vR);
   double vR2       = vR*vR;
   double vR_E      = vR/E;
   double Q2_4E2    = Q2/(4*E2);
   double Q2_2MExiR = Q2/(2*Mnuc*E*xiR);
   double Z         = this->ZR(interaction);
   double D         = this->DR(interaction);
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("QELCharmXSec", pDEBUG)
      << "Z = " << Z << ", D = " << D << ". xiR = " << xiR << ", vR = " << vR;
 #endif
 
   double xsec = Gf*Z*D * (1 - vR_E + Q2_4E2 + Q2_2MExiR) *
                                      TMath::Sqrt(vR2 + Q2) / (vR*xiR);
 
   //----- The algorithm computes dxsec/dQ2
   //      Check whether variable tranformation is needed
   if(kps!=kPSQ2fE) {
     double J = utils::kinematics::Jacobian(interaction,kPSQ2fE,kps);
     xsec *= J;
   }
 
   //----- If requested return the free nucleon xsec even for input nuclear tgt
   if( interaction->TestBit(kIAssumeFreeNucleon) ) return xsec;
 
   //----- Nuclear cross section (simple scaling here)
   int nuc   = target.HitNucPdg();
   int NNucl = (pdg::IsProton(nuc)) ? target.Z() : target.N();
   xsec *= NNucl;
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("QELCharmXSec", pINFO)
      << "dsigma/dQ2(E=" << E << ", Q2=" << Q2 << ") = "
                              << xsec / (1E-40*units::cm2) << " x 1E-40 cm^2";
 #endif
 
   return xsec;
 }

double KovalenkoQELCharmPXSec::ZR ( const Interaction * interaction ) const

private

Definition at line 126 of file KovalenkoQELCharmPXSec.cxx.

 {
   const XclsTag &      xcls       = interaction->ExclTag();
   const InitialState & init_state = interaction->InitState();
 
   int pdgc = xcls.CharmHadronPdg();
   bool isP = pdg::IsProton ( init_state.Tgt().HitNucPdg() );
   bool isN = pdg::IsNeutron( init_state.Tgt().HitNucPdg() );
 
   if      ( pdgc == kPdgLambdaPc && isN ) return fScLambdaP;
   else if ( pdgc == kPdgSigmaPc  && isN ) return fScSigmaP;
   else if ( pdgc == kPdgSigmaPPc && isP ) return fScSigmaPP;
   else                                    abort();
 }

Member Data Documentation

double genie::KovalenkoQELCharmPXSec::fMo

private

Definition at line 79 of file KovalenkoQELCharmPXSec.h.

const PDFModelI* genie::KovalenkoQELCharmPXSec::fPDFModel

private

Definition at line 75 of file KovalenkoQELCharmPXSec.h.

double genie::KovalenkoQELCharmPXSec::fResDMLambda

private

Definition at line 83 of file KovalenkoQELCharmPXSec.h.

double genie::KovalenkoQELCharmPXSec::fResDMSigma

private

Definition at line 84 of file KovalenkoQELCharmPXSec.h.

double genie::KovalenkoQELCharmPXSec::fScLambdaP

private

Definition at line 80 of file KovalenkoQELCharmPXSec.h.

double genie::KovalenkoQELCharmPXSec::fScSigmaP

private

Definition at line 81 of file KovalenkoQELCharmPXSec.h.

double genie::KovalenkoQELCharmPXSec::fScSigmaPP

private

Definition at line 82 of file KovalenkoQELCharmPXSec.h.

const XSecIntegratorI* genie::KovalenkoQELCharmPXSec::fXSecIntegrator

private

const IntegratorI * fIntegrator;

Definition at line 77 of file KovalenkoQELCharmPXSec.h.

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

Generator/src/Physics/Charm/XSection/KovalenkoQELCharmPXSec.h
Generator/src/Physics/Charm/XSection/KovalenkoQELCharmPXSec.cxx

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation