Computes, at Leading Order (LO), the differential cross section for neutrino charm production using the Aivazis,Olness,Tung model. Is a concrete implementation of the XSecAlgorithmI interface. More...

#include <AivazisCharmPXSecLO.h>

Inheritance diagram for genie::AivazisCharmPXSecLO:

Public Member Functions
	AivazisCharmPXSecLO ()

	AivazisCharmPXSecLO (string config)

virtual	~AivazisCharmPXSecLO ()

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...

void	Configure (const Registry &config)

void	Configure (string param_set)

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

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

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)

Private Attributes
const PDFModelI *	fPDFModel

const XSecIntegratorI *	fXSecIntegrator

double	fMc

double	fVcd

double	fVcs

double	fMc2

double	fVcd2

double	fVcs2

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, at Leading Order (LO), the differential cross section for neutrino charm production using the Aivazis,Olness,Tung model. Is a concrete implementation of the XSecAlgorithmI interface.

M.A.G.Aivazis, F.I.Olness and W.K.Tung Phys.Rev.D50, 3085-3101 (1994)

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

June 10, 2004

Definition at line 33 of file AivazisCharmPXSecLO.h.

Constructor & Destructor Documentation

AivazisCharmPXSecLO::AivazisCharmPXSecLO ( )

Definition at line 35 of file AivazisCharmPXSecLO.cxx.

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

AivazisCharmPXSecLO::AivazisCharmPXSecLO ( string config )

Definition at line 41 of file AivazisCharmPXSecLO.cxx.

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

AivazisCharmPXSecLO::~AivazisCharmPXSecLO ( )

virtual

Definition at line 47 of file AivazisCharmPXSecLO.cxx.

 {
 
 }

Member Function Documentation

void AivazisCharmPXSecLO::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 191 of file AivazisCharmPXSecLO.cxx.

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

void AivazisCharmPXSecLO::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 197 of file AivazisCharmPXSecLO.cxx.

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

double AivazisCharmPXSecLO::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 162 of file AivazisCharmPXSecLO.cxx.

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

void AivazisCharmPXSecLO::LoadConfig ( void )

private

Definition at line 203 of file AivazisCharmPXSecLO.cxx.

 {
 
   // read mc, Vcd, Vcs from config or set defaults
   GetParam( "Charm-Mass", fMc ) ;
   GetParam( "CKM-Vcd", fVcd ) ;
   GetParam( "CKM-Vcs", fVcs ) ;
 
   fMc2   = TMath::Power(fMc,  2);
   fVcd2  = TMath::Power(fVcd, 2);
   fVcs2  = TMath::Power(fVcs, 2);
 
   // load PDF set
   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);
 }

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

virtual

Can this cross section algorithm handle the input process?

Implements genie::XSecAlgorithmI.

Definition at line 168 of file AivazisCharmPXSecLO.cxx.

 {
   if(interaction->TestBit(kISkipProcessChk)) return true;
 
   const XclsTag &      xcls       = interaction->ExclTag();
   const InitialState & init_state = interaction->InitState();
   const ProcessInfo &  proc_info  = interaction->ProcInfo();
 
   if(!proc_info.IsDeepInelastic()) return false;
   if(!proc_info.IsWeak())          return false;
 
   bool is_inclusive_charm = (xcls.IsCharmEvent() && xcls.IsInclusiveCharm());
   if(!is_inclusive_charm) return false;
 
   int  nu  = init_state.ProbePdg();
   int  nuc = init_state.Tgt().HitNucPdg();
 
   if (!pdg::IsProton(nuc)  && !pdg::IsNeutron(nuc))     return false;
   if (!pdg::IsNeutrino(nu) && !pdg::IsAntiNeutrino(nu)) return false;
 
   return true;
 }

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

virtual

Compute the cross section for the input interaction.

Implements genie::XSecAlgorithmI.

Definition at line 52 of file AivazisCharmPXSecLO.cxx.

 {
   if(! this -> ValidProcess    (interaction) ) return 0.;
   if(! this -> ValidKinematics (interaction) ) return 0.;
 
   if(interaction->ProcInfo().IsWeakNC() || interaction->ProcInfo().IsDarkMatter()) return 0;
 
   //----- get init-state & kinematical parameters
   const Kinematics &   kinematics = interaction -> Kine();
   const InitialState & init_state = interaction -> InitState();
   const Target &       target     = init_state.Tgt();
 
   //----- get target information (hit nucleon and quark)
   int  nu    = init_state.ProbePdg();
   int  nuc   = target.HitNucPdg();
   bool isP   = pdg::IsProton (nuc);
   bool isN   = pdg::IsNeutron(nuc);
   bool qset  = target.HitQrkIsSet();
   int  qpdg  = (qset) ? target.HitQrkPdg()       : 0;
   bool sea   = (qset) ? target.HitSeaQrk()       : false;
   bool isd   = (qset) ? pdg::IsDQuark     (qpdg) : false;
   bool iss   = (qset) ? pdg::IsSQuark     (qpdg) : false;
   bool isdb  = (qset) ? pdg::IsAntiDQuark (qpdg) : false;
   bool issb  = (qset) ? pdg::IsAntiSQuark (qpdg) : false;
   bool isnu  = pdg::IsNeutrino(nu);
   bool isnub = pdg::IsAntiNeutrino(nu);
 
   //----- compute kinematic & auxiliary parameters
   double E           = init_state.ProbeE(kRfHitNucRest);
   double x           = kinematics.x();
   double y           = kinematics.y();
   double x2          = TMath::Power(x,    2);
   double Mnuc        = target.HitNucMass();
   double Mnuc2       = TMath::Power(Mnuc, 2);
   double Q2          = 2*Mnuc*E*x*y;
   double inverse_eta = 0.5/x + TMath::Sqrt( 0.25/x2 + Mnuc2/Q2 );
   double eta         = 1 / inverse_eta;
   double xi          = eta * (1 + fMc2/Q2);
   double coshpsi     = (2-y)/y; // hyperbolic-cosine(psi)
   double sinh2psi    = TMath::Power(coshpsi, 2) - 1;
 
   //----- make sure that the mass-corrected x is in physical region
   if(xi<=0 || xi>1) return 0;
 
   //----- Calculate the PDFs
   PDF pdfs;
   pdfs.SetModel(fPDFModel);  // <-- attach algorithm
   pdfs.Calculate(xi, Q2);    // <-- calculate
 
   //----- proton pdfs
   double us = pdfs.UpSea()/xi;
   double uv = pdfs.UpValence()/xi;
   double ds = pdfs.DownSea()/xi;
   double dv = pdfs.DownValence()/xi;
   double s  = pdfs.Strange()/xi;
 
   //----- if the hit nucleon is a neutron, swap u<->d
   double tmp;
   if (isN) {
     tmp = uv; uv = dv; dv = tmp;
     tmp = us; us = ds; ds = tmp;
   }
 
   //----- if a hit quark has been set then switch off other contributions
   if(qset) {
     if(isnub) { bool pass = (isdb||issb)&&sea; if(!pass) return 0; }
     if(isnu)  { bool pass = isd||(iss&&sea);   if(!pass) return 0; }
     dv = (  isd        && !sea) ? dv : 0.;
     ds = ( (isd||isdb) &&  sea) ? ds : 0.;
     s  = ( (iss||issb) &&  sea) ? s  : 0.;
   }
   //----- in case of a \bar{v}+N calculation (quark not set) zero the d/val contribution
   if(isnub) dv=0;
 
   //----- calculate the cross section
   double Gw2    = TMath::Power((kGF/kSqrt2)*(1+Q2/kMw2), 2);
   double f1     = TMath::Power( (1+coshpsi)/2, 2);
   double f2     = 0.25 * (fMc2/Q2) * sinh2psi;
   double xsec_0 = 2 * Gw2 * (y*Q2/kPi) * (f1+f2);
   double xsec_d = xsec_0 * fVcd2 * (dv+ds);
   double xsec_s = xsec_0 * fVcs2 * s;
   double xsec   = xsec_d + xsec_s;
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   double W2          = Mnuc2 + 2*Mnuc*E*y*(1-x);
   double W           = TMath::Max(0., TMath::Sqrt(W2));
   LOG("DISCharmXSec", pDEBUG)
     << "\n dxsec[DISCharm,FreeN]/dxdy (E= " << E
                  << ", x= " << x << ", y= " << y
                          << ", W= " << W << ", Q2 = " << Q2 << ") = " << xsec;
 #endif
 
   //----- The algorithm computes d^2xsec/dxdy
   //      Check whether variable tranformation is needed
   if(kps!=kPSxyfE) {
     double J = utils::kinematics::Jacobian(interaction,kPSxyfE,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 NNucl = (isP) ? target.Z() : target.N();
   xsec *= NNucl;
 
   return xsec;
 }

Member Data Documentation

double genie::AivazisCharmPXSecLO::fMc

private

Definition at line 59 of file AivazisCharmPXSecLO.h.

double genie::AivazisCharmPXSecLO::fMc2

private

Definition at line 62 of file AivazisCharmPXSecLO.h.

const PDFModelI* genie::AivazisCharmPXSecLO::fPDFModel

private

Definition at line 54 of file AivazisCharmPXSecLO.h.

double genie::AivazisCharmPXSecLO::fVcd

private

Definition at line 60 of file AivazisCharmPXSecLO.h.

double genie::AivazisCharmPXSecLO::fVcd2

private

Definition at line 63 of file AivazisCharmPXSecLO.h.

double genie::AivazisCharmPXSecLO::fVcs

private

Definition at line 61 of file AivazisCharmPXSecLO.h.

double genie::AivazisCharmPXSecLO::fVcs2

private

Definition at line 64 of file AivazisCharmPXSecLO.h.

const XSecIntegratorI* genie::AivazisCharmPXSecLO::fXSecIntegrator

private

Definition at line 55 of file AivazisCharmPXSecLO.h.

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

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

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation