genie::mueloss::KokoulinPetrukhinModel Class Reference

Kokoulin-Petrukhin model for the energy loss of muons due to direct e+e- pair production. Concrete implementation of the MuELossI interface. More...

#include <KokoulinPetrukhinModel.h>

Inheritance diagram for genie::mueloss::KokoulinPetrukhinModel:

Public Member Functions
	KokoulinPetrukhinModel ()
	KokoulinPetrukhinModel (string config)
virtual	~KokoulinPetrukhinModel ()
double	dE_dx (double E, MuELMaterial_t material) const
	Implement the MuELossI interface. More...
MuELProcess_t	Process (void) const
Public Member Functions inherited from genie::mueloss::MuELossI
virtual	~MuELossI ()
Public Member Functions inherited from genie::Algorithm
virtual	~Algorithm ()
virtual void	Configure (const Registry &config)
virtual void	Configure (string config)
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...

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::mueloss::MuELossI
	MuELossI ()
	MuELossI (string name)
	MuELossI (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

Kokoulin-Petrukhin model for the energy loss of muons due to direct e+e- pair production. Concrete implementation of the MuELossI interface.

W.Lohmann, R.Kopp and R.Voss, Energy Loss of Muons in the Energy Range 1-10000 GeV, CERN 85-03

Author

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

December 10, 2003

Copyright (c) 2003-2020, The GENIE Collaboration For the full text of the license visit http://copyright.genie-mc.org

Definition at line 37 of file KokoulinPetrukhinModel.h.

Constructor & Destructor Documentation

KokoulinPetrukhinModel::KokoulinPetrukhinModel

(

)

Definition at line 22 of file KokoulinPetrukhinModel.cxx.

                                               :
MuELossI("genie::mueloss::KokoulinPetrukhinModel")
{

}

KokoulinPetrukhinModel::KokoulinPetrukhinModel

(

string

config

)

Definition at line 28 of file KokoulinPetrukhinModel.cxx.

                                                            :
MuELossI("genie::mueloss::KokoulinPetrukhinModel", config)
{

}

KokoulinPetrukhinModel::~KokoulinPetrukhinModel ( )

virtual

Definition at line 34 of file KokoulinPetrukhinModel.cxx.

{

}

Member Function Documentation

double KokoulinPetrukhinModel::dE_dx ( double  E, MuELMaterial_t  material  ) const

virtual

Implement the MuELossI interface.

Implements genie::mueloss::MuELossI.

Definition at line 39 of file KokoulinPetrukhinModel.cxx.

{
// Calculate the muon -dE/dx due to e+e- pair production (in GeV^-2).
// To convert the result to more handly units, eg MeV/(gr/cm^2), just write:
// dE_dx /= (units::MeV/(units::g/units::cm2));

  if(material == eMuUndefined) return 0;
  if(E<=MuELProcess::Threshold(this->Process()) || E>=kMaxMuE) return 0;

  // material Z,E
  double Z = MuELMaterial::Z(material);
  double A = MuELMaterial::A(material);

  // calculate (the min,max) fraction of energy, v, carried to the photon
  double Vmin = 4.*kElectronMass/E;
  double Vmax = 1. - 0.75*kSqrtNapierConst* (kMuonMass/E) * TMath::Power(Z,1/3.);

  // claculate the limits of the asymmetry parameter of the e+e- pair
  // p = (E(+) - E(-)) / (E(+) + E(-))
  double Pmin = 0.;
  double Pmax = 1.;

  // integrate the Kokulin-Petrukhin differential cross section v*ds/dv for
  // muon e+e- pair production over v and p

  ROOT::Math::IBaseFunctionMultiDim * integrand =
      new gsl::KokoulinPetrukhinIntegrand(E, Z);
  ROOT::Math::IntegrationMultiDim::Type ig_type =
      utils::gsl::IntegrationNDimTypeFromString("adaptive");

  double abstol   = 1; // We mostly care about relative tolerance.
  double reltol   = 1E-4;
  int    nmaxeval = 500000;

  ROOT::Math::IntegratorMultiDim ig(*integrand, ig_type, abstol, reltol, nmaxeval);

  double min[2] = { Vmin, Pmin };
  double max[2] = { Vmax, Pmax };

  // calculate the b factor (bE = -dE/dx) in GeV^-3
  A *= units::g;
  double bpair = (2*kNA/A) * ig.Integral(min, max);

  delete integrand;

  // calculate the dE/dx due to muon bremsstrahlung in GeV^-2
  double de_dx = bpair*E;
  return de_dx;
}

MuELProcess_t genie::mueloss::KokoulinPetrukhinModel::Process ( void  ) const

inlinevirtual

Implements genie::mueloss::MuELossI.

Definition at line 47 of file KokoulinPetrukhinModel.h.

{ return eMupPairProduction; }

---

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

• Generator/src/Physics/MuonEnergyLoss/KokoulinPetrukhinModel.h
• Generator/src/Physics/MuonEnergyLoss/KokoulinPetrukhinModel.cxx