nuebar + e- -> mu- + numubar [CC] scattering differential cross section
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#include <IMDAnnihilationPXSec.h>

Inheritance diagram for genie::IMDAnnihilationPXSec:

Public Member Functions
	IMDAnnihilationPXSec ()

	IMDAnnihilationPXSec (string config)

virtual	~IMDAnnihilationPXSec ()

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 config)

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)

Private Attributes
const XSecIntegratorI *	fXSecIntegrator

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

nuebar + e- -> mu- + numubar [CC] scattering differential cross section

Is a concrete implementation of the XSecAlgorithmI interface.
W.J.Marciano and Z.Parsa, Neutrino-electron scattering theory, J.Phys.G: Nucl.Part.Phys. 29 (2003) 2629-2645

Author: Rosen Matev (r.mat.nosp@m.ev@g.nosp@m.mail..nosp@m.com)

October 3, 2011

Definition at line 33 of file IMDAnnihilationPXSec.h.

Constructor & Destructor Documentation

IMDAnnihilationPXSec::IMDAnnihilationPXSec ( )

Definition at line 26 of file IMDAnnihilationPXSec.cxx.

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

IMDAnnihilationPXSec::IMDAnnihilationPXSec ( string config )

Definition at line 32 of file IMDAnnihilationPXSec.cxx.

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

IMDAnnihilationPXSec::~IMDAnnihilationPXSec ( )

virtual

Definition at line 38 of file IMDAnnihilationPXSec.cxx.

 {
 
 }

Member Function Documentation

void IMDAnnihilationPXSec::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 108 of file IMDAnnihilationPXSec.cxx.

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

void IMDAnnihilationPXSec::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 114 of file IMDAnnihilationPXSec.cxx.

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

double IMDAnnihilationPXSec::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 90 of file IMDAnnihilationPXSec.cxx.

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

void IMDAnnihilationPXSec::LoadConfig ( void )

private

Definition at line 120 of file IMDAnnihilationPXSec.cxx.

 {
   // load XSec Integrator
   fXSecIntegrator =
       dynamic_cast<const XSecIntegratorI *> (this->SubAlg("XSec-Integrator"));
   assert(fXSecIntegrator);
 }

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

virtual

Is the input kinematical point a physically allowed one?

Reimplemented from genie::XSecAlgorithmI.

Definition at line 102 of file IMDAnnihilationPXSec.cxx.

 {
   if(interaction->TestBit(kISkipKinematicChk)) return true;
   return true;
 }

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

virtual

Can this cross section algorithm handle the input process?

Implements genie::XSecAlgorithmI.

Definition at line 96 of file IMDAnnihilationPXSec.cxx.

 {
   if(interaction->TestBit(kISkipProcessChk)) return true;
   return true;
 }

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

virtual

Compute the cross section for the input interaction.

Implements genie::XSecAlgorithmI.

Definition at line 43 of file IMDAnnihilationPXSec.cxx.

 {
   if(! this -> ValidProcess    (interaction) ) return 0.;
   if(! this -> ValidKinematics (interaction) ) return 0.;
 
   //----- get initial state & kinematics
   const InitialState & init_state = interaction -> InitState();
   const Kinematics &   kinematics = interaction -> Kine();
 
   double Ev = init_state.ProbeE(kRfLab);
   double twoMeEv = 2*kElectronMass*Ev;
   double ymax = 1 - kMuonMass2/(twoMeEv + kElectronMass2);
   double y  = kinematics.y();
   double A  = kGF2/kPi;
 
   LOG("IMDAnnihilation", pDEBUG) << "Ev = " << Ev << ", y = " << y << ", ymax = " << ymax;
   //Note: y = (Ev-El)/Ev but in Marciano's paper y=(El-(m_l^2+m_e^2)/2m_e)/Ev.
   y = 1 - y - (kMuonMass2 + kElectronMass2)/twoMeEv;
 
   if(y > ymax) return 0;
   if(y < 0) return 0;
 
   double xsec = A*(twoMeEv*TMath::Power(1-y,2) - (kMuonMass2 - kElectronMass2)*(1-y)); // <-- dxsec/dy
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("IMDAnnihilation", pDEBUG)
     << "*** dxsec(ve-)/dy [free e-](Ev="<< Ev << ", y= "<< y<< ") = "<< xsec;
 #endif
 
   //----- The algorithm computes dxsec/dy
   //      Check whether variable tranformation is needed
   if(kps!=kPSyfE) {
     double J = utils::kinematics::Jacobian(interaction,kPSyfE,kps);
     xsec *= J;
   }
 
   //----- If requested return the free electron xsec even for nuclear target
   if( interaction->TestBit(kIAssumeFreeElectron) ) return xsec;
 
   //----- Scale for the number of scattering centers at the target
   int Ne = init_state.Tgt().Z(); // num of scattering centers
   xsec *= Ne;
 
   return xsec;
 }

Member Data Documentation

const XSecIntegratorI* genie::IMDAnnihilationPXSec::fXSecIntegrator

private

Definition at line 54 of file IMDAnnihilationPXSec.h.

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

Generator/src/Physics/NuElectron/XSection/IMDAnnihilationPXSec.h
Generator/src/Physics/NuElectron/XSection/IMDAnnihilationPXSec.cxx

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation