genie::SmithMonizQELCCPXSec Class Reference

Computes neutrino-nucleon(nucleus) QELCC differential cross section. Is a concrete implementation of the XSecAlgorithmI interface. More...

#include <SmithMonizQELCCPXSec.h>

Inheritance diagram for genie::SmithMonizQELCCPXSec:

Collaboration diagram for genie::SmithMonizQELCCPXSec:

Public Member Functions
	SmithMonizQELCCPXSec ()
	SmithMonizQELCCPXSec (string config)
virtual	~SmithMonizQELCCPXSec ()
double	XSec (const Interaction *i, KinePhaseSpace_t kps) const
	Compute the cross section for the input interaction.
double	Integral (const Interaction *i) const
bool	ValidProcess (const Interaction *i) const
	Can this cross section algorithm handle the input process?
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?
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 Member Functions
void	LoadConfig (void)
double	d3sQES_dQ2dvdkF_SM (const Interaction *interaction) const
double	dsQES_dQ2_SM (const Interaction *interaction) const
double	d2sQES_dQ2dv_SM (const Interaction *i) const

Private Attributes
SmithMonizUtils *	sm_utils
double	fXSecScale
	external xsec scaling factor
QELFormFactors	fFormFactors
const QELFormFactorsModelI *	fFormFactorsModel
const XSecIntegratorI *	fXSecIntegrator
double	fVud2
	|Vud|^2(square of magnitude ud-element of CKM-matrix)

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::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.
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::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

Computes neutrino-nucleon(nucleus) QELCC differential cross section. Is a concrete implementation of the XSecAlgorithmI interface.

References:\n [1] R.A.Smith and E.J.Moniz,

Nuclear Physics B43, (1972) 605-622
[2] K.S. Kuzmin, V.V. Lyubushkin, V.A.Naumov, Eur. Phys. J. C54, (2008) 517-538

Author

Igor Kakorin kakor.nosp@m.in@j.nosp@m.inr.r.nosp@m.u Joint Institute for Nuclear Research
adapted from fortran code provided by:
Konstantin Kuzmin kkuzm.nosp@m.in@t.nosp@m.heor..nosp@m.jinr.nosp@m..ru Joint Institute for Nuclear Research
Vladimir Lyubushkin Joint Institute for Nuclear Research
Vadim Naumov vnaum.nosp@m.ov@t.nosp@m.heor..nosp@m.jinr.nosp@m..ru Joint Institute for Nuclear Research
based on code of:
Costas Andreopoulos <c.andreopoulos \at cern.ch> University of Liverpool

Created:\n May 05, 2017

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 52 of file SmithMonizQELCCPXSec.h.

Constructor & Destructor Documentation

SmithMonizQELCCPXSec() [1/2]

SmithMonizQELCCPXSec::SmithMonizQELCCPXSec

(

)

Definition at line 55 of file SmithMonizQELCCPXSec.cxx.

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

References genie::XSecAlgorithmI::XSecAlgorithmI().

SmithMonizQELCCPXSec() [2/2]

SmithMonizQELCCPXSec::SmithMonizQELCCPXSec

(

string

config

)

Definition at line 61 of file SmithMonizQELCCPXSec.cxx.

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

References genie::XSecAlgorithmI::XSecAlgorithmI().

~SmithMonizQELCCPXSec()

SmithMonizQELCCPXSec::~SmithMonizQELCCPXSec ( )

virtual

Definition at line 67 of file SmithMonizQELCCPXSec.cxx.

{
 
}

Member Function Documentation

Configure() [1/2]

void SmithMonizQELCCPXSec::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 154 of file SmithMonizQELCCPXSec.cxx.

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

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

Configure() [2/2]

void SmithMonizQELCCPXSec::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 160 of file SmithMonizQELCCPXSec.cxx.

{
  Algorithm::Configure(config);
 
  Registry r( "SmithMonizQELCCPXSec_specific", false ) ;
  r.Set("sm_utils_algo", RgAlg("genie::SmithMonizUtils","Default") ) ;
 
  Algorithm::Configure(r) ;
 
  this->LoadConfig();
}

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

d2sQES_dQ2dv_SM()

double SmithMonizQELCCPXSec::d2sQES_dQ2dv_SM ( const Interaction * i ) const

private

Definition at line 311 of file SmithMonizQELCCPXSec.cxx.

{
  Kinematics *  kinematics = interaction -> KinePtr();
  sm_utils->SetInteraction(interaction);
  const InitialState & init_state = interaction -> InitState();
  //  Assuming that the energy is greater of threshold. 
  //  See condition in method SmithMonizQELCCXSec::Integrate
  //  interaction->InitState().ProbeE(kRfLab)<sm_utils->E_nu_thr_SM()
  //  of SmithMonizQELCCXSec.cxx 
  //  if (E_nu < sm_utils->E_nu_thr_SM()) return 0;
  //  Assuming that variables Q2 and \nu are within allowable kinematic region
  //  which are specified in method: genie::utils::gsl::d2Xsec_dQ2dv::DoEval
  double Q2      = kinematics->GetKV(kKVQ2);
  double v       = kinematics->GetKV(kKVv);
  Range1D_t rkF  = sm_utils->kFQES_SM_lim(Q2,v);
 
  const Target & target = init_state.Tgt();
  
 
 
//  Gaussian quadratures integrate over Fermi momentum
  double R[48]= { 0.16276744849602969579e-1,0.48812985136049731112e-1,
                  0.81297495464425558994e-1,1.13695850110665920911e-1,
                  1.45973714654896941989e-1,1.78096882367618602759e-1,
                  2.10031310460567203603e-1,2.41743156163840012328e-1,
                  2.73198812591049141487e-1,3.04364944354496353024e-1,
                  3.35208522892625422616e-1,3.65696861472313635031e-1,
                  3.95797649828908603285e-1,4.25478988407300545365e-1,
                  4.54709422167743008636e-1,4.83457973920596359768e-1,
                  5.11694177154667673586e-1,5.39388108324357436227e-1,
                  5.66510418561397168404e-1,5.93032364777572080684e-1,
                  6.18925840125468570386e-1,6.44163403784967106798e-1,
                  6.68718310043916153953e-1,6.92564536642171561344e-1,
                  7.15676812348967626225e-1,7.38030643744400132851e-1,
                  7.59602341176647498703e-1,7.80369043867433217604e-1,
                  8.00308744139140817229e-1,8.19400310737931675539e-1,
                  8.37623511228187121494e-1,8.54959033434601455463e-1,
                  8.71388505909296502874e-1,8.86894517402420416057e-1,
                  9.01460635315852341319e-1,9.15071423120898074206e-1,
                  9.27712456722308690965e-1,9.39370339752755216932e-1,
                  9.50032717784437635756e-1,9.59688291448742539300e-1,
                  9.68326828463264212174e-1,9.75939174585136466453e-1,
                  9.82517263563014677447e-1,9.88054126329623799481e-1,
                  9.92543900323762624572e-1,9.95981842987209290650e-1,
                  9.98364375863181677724e-1,9.99689503883230766828e-1};
 
  double W[48]= { 0.00796792065552012429e-1,0.01853960788946921732e-1,
                  0.02910731817934946408e-1,0.03964554338444686674e-1,
                  0.05014202742927517693e-1,0.06058545504235961683e-1,
                  0.07096470791153865269e-1,0.08126876925698759217e-1,
                  0.09148671230783386633e-1,0.10160770535008415758e-1,
                  0.11162102099838498591e-1,0.12151604671088319635e-1,
                  0.13128229566961572637e-1,0.14090941772314860916e-1,
                  0.15038721026994938006e-1,0.15970562902562291381e-1,
                  0.16885479864245172450e-1,0.17782502316045260838e-1,
                  0.18660679627411467395e-1,0.19519081140145022410e-1,
                  0.20356797154333324595e-1,0.21172939892191298988e-1,
                  0.21966644438744349195e-1,0.22737069658329374001e-1,
                  0.23483399085926219842e-1,0.24204841792364691282e-1,
                  0.24900633222483610288e-1,0.25570036005349361499e-1,
                  0.26212340735672413913e-1,0.26826866725591762198e-1,
                  0.27412962726029242823e-1,0.27970007616848334440e-1,
                  0.28497411065085385646e-1,0.28994614150555236543e-1,
                  0.29461089958167905970e-1,0.29896344136328385984e-1,
                  0.30299915420827593794e-1,0.30671376123669149014e-1,
                  0.31010332586313837423e-1,0.31316425596861355813e-1,
                  0.31589330770727168558e-1,0.31828758894411006535e-1,
                  0.32034456231992663218e-1,0.32206204794030250669e-1,
                  0.32343822568575928429e-1,0.32447163714064269364e-1,
                  0.32516118713868835987e-1,0.32550614492363166242e-1};
 
  double Sum = 0;
  for(int i = 0;i<48;i++)
  {
    double kF = 0.5*(-R[i]*(rkF.max-rkF.min)+rkF.min+rkF.max);
    kinematics->SetKV(kKVPn, kF);
    Sum+=d3sQES_dQ2dvdkF_SM(interaction)*W[47-i];
    kF = 0.5*(R[i]*(rkF.max-rkF.min)+rkF.min+rkF.max);
    kinematics->SetKV(kKVPn, kF);
    Sum+=d3sQES_dQ2dvdkF_SM(interaction)*W[47-i];
  }
 
  double xsec = 0.5*Sum*(rkF.max-rkF.min);
 
  int nucpdgc = target.HitNucPdg();
  int NNucl = (pdg::IsProton(nucpdgc)) ? target.Z() : target.N();
 
  xsec *= NNucl; // nuclear xsec
 
  // Apply given scaling factor
  xsec *= fXSecScale;
 
  return xsec;
 
}

References d3sQES_dQ2dvdkF_SM(), fXSecScale, genie::Target::HitNucPdg(), genie::pdg::IsProton(), genie::kKVPn, genie::kKVQ2, genie::kKVv, genie::Range1D_t::max, genie::Range1D_t::min, genie::Target::N(), sm_utils, genie::InitialState::Tgt(), and genie::Target::Z().

Referenced by XSec().

d3sQES_dQ2dvdkF_SM()

double SmithMonizQELCCPXSec::d3sQES_dQ2dvdkF_SM ( const Interaction * interaction ) const

private

Definition at line 199 of file SmithMonizQELCCPXSec.cxx.

{
  // Assuming that variables E_nu, Q2, \nu and kF are within allowable kinematic region
  // which are specified in methods: genie::utils::gsl::d2Xsec_dQ2dv::DoEval and QELEventGeneratorSM::ProcessEventRecord
  // Get kinematics & init-state parameters
  const Kinematics &  kinematics = interaction -> Kine();
  sm_utils->SetInteraction(interaction);
  const InitialState & init_state = interaction -> InitState();
  const Target & target = init_state.Tgt();
  double E_nu    = init_state.ProbeE(kRfLab);
  double Q2      = kinematics.GetKV(kKVQ2);
  double v       = kinematics.GetKV(kKVv);
  double kF      = kinematics.GetKV(kKVPn);
  double kkF     = kF*kF;
  int nucl_pdg_ini = target.HitNucPdg();
  int nucl_pdg_fin = genie::pdg::SwitchProtonNeutron(nucl_pdg_ini);
  
  PDGLibrary * pdglib = PDGLibrary::Instance();
  TParticlePDG * nucl_fin = pdglib->Find( nucl_pdg_fin );
 
  double E_BIN   = sm_utils->GetBindingEnergy();
  double m_ini   = target.HitNucMass();
  double mm_ini  = m_ini*m_ini;
  double m_fin   = nucl_fin -> Mass();                         //  Mass of final hadron or hadron system (GeV)
  double mm_fin  = m_fin*m_fin;
  double m_tar   = target.Mass();                              //  Mass of target nucleus (GeV)
  double mm_tar  = m_tar*m_tar;
  
  // One of the xsec terms changes sign for antineutrinos
  bool is_neutrino = pdg::IsNeutrino(init_state.ProbePdg());
  int n_NT = (is_neutrino) ? +1 : -1;
  
  double E_p     = TMath::Sqrt(mm_ini+kkF)-E_BIN;
  //|\vec{q}|
  double qqv     = v*v+Q2;
  double qv      = TMath::Sqrt(qqv);
  double cosT_p  = ((v-E_BIN)*(2*E_p+v+E_BIN)-qqv+mm_ini-mm_fin)/(2*kF*qv);           //\cos\theta_p
  if (cosT_p < -1.0 || cosT_p > 1.0 ) 
  {
     return 0.0;
  }
  
  double pF      = TMath::Sqrt(kkF+(2*kF*qv)*cosT_p+qqv);
  
  double E_lep   = E_nu-v;
  double m_lep = interaction->FSPrimLepton()->Mass();
  double mm_lep = m_lep*m_lep;
  if (E_lep < m_lep) 
  {
    return 0.0;
  }
  double P_lep   = TMath::Sqrt(E_lep*E_lep-mm_lep);
  double k6 = (Q2+mm_lep)/(2*E_nu);
  double cosT_lep= (E_lep-k6)/P_lep;
  if (cosT_lep < -1.0 || cosT_lep > 1.0 ) return 0.0;
  
  double cosT_k  = (v+k6)/qv;
  if (cosT_k < -1.0 || cosT_k > 1.0 ) return 0.0;
 
  double b2_flux = (E_p-kF*cosT_k*cosT_p)*(E_p-kF*cosT_k*cosT_p);
  double c2_flux = kkF*(1-cosT_p*cosT_p)*(1-cosT_k*cosT_k);
  
  double k1 = fVud2*kNucleonMass2*kPi;
  double k2 = mm_lep/(2*mm_tar);
  double k7 = P_lep*cosT_lep;
 
  double P_Fermi = sm_utils->GetFermiMomentum();
  double FV_SM   = 4.0*TMath::Pi()/3*TMath::Power(P_Fermi, 3);
  double factor  = k1*(m_tar*kF/(FV_SM*qv*TMath::Sqrt(b2_flux-c2_flux)))*SmithMonizUtils::rho(P_Fermi, 0.0, kF)*(1-SmithMonizUtils::rho(P_Fermi, 0.01, pF));
 
  double a2      = kkF/kNucleonMass2;
  double a3      = a2*cosT_p*cosT_p;
  double a6      = kF*cosT_p/kNucleonMass;
  double a7      = E_p/kNucleonMass;
  double a4      = a7*a7;
  double a5      = 2*a7*a6;
 
  double k3      = v/qv;
  double k4      = (3*a3-a2)/qqv;
  double k5      = (a7-a6*k3)*m_tar/kNucleonMass;
  
  // Calculate the QEL form factors
  fFormFactors.Calculate(interaction);
  double F_V   = fFormFactors.F1V();
  double F_M   = fFormFactors.xiF2V();
  double F_A   = fFormFactors.FA();
  double F_P   = fFormFactors.Fp();
  double FF_V  = F_V*F_V;
  double FF_M  = F_M*F_M;
  double FF_A  = F_A*F_A;
 
  double t       = Q2/(4*kNucleonMass2);
  double W_1     = FF_A*(1+t)+t*(F_V+F_M)*(F_V+F_M);                     //Ref.[1], \tilde{T}_1
  double W_2     = FF_A+FF_V+t*FF_M;                                     //Ref.[1], \tilde{T}_2
  double W_3     =-2*F_A*(F_V+F_M);                                      //Ref.[1], \tilde{T}_8
  double W_4     =-0.5*F_V*F_M-F_A*F_P+t*F_P*F_P-0.25*(1-t)*FF_M;        //Ref.[1], \tilde{T}_\alpha
  double W_5     = FF_V+t*FF_M+FF_A;
 
  double T_1     = 1.0*W_1+(a2-a3)*0.5*W_2;                              //Ref.[1], W_1
  double T_2     = ((a2-a3)*Q2/(2*qqv)+a4-k3*(a5-k3*a3))*W_2;            //Ref.[1], W_2
  double T_3     = k5*W_3;                                               //Ref.[1], W_8
  double T_4     = mm_tar*(0.5*W_2*k4+1.0*W_4/kNucleonMass2+a6*W_5/(kNucleonMass*qv));    //Ref.[1], W_\alpha
  double T_5     = k5*W_5+m_tar*(a5/qv-v*k4)*W_2;
 
  double xsec    = kGF2*factor*((E_lep-k7)*(T_1+k2*T_4)/m_tar+(E_lep+k7)*T_2/(2*m_tar)
                   +n_NT*T_3*((E_nu+E_lep)*(E_lep-k7)/(2*mm_tar)-k2)-k2*T_5)
                   *(kMw2/(kMw2+Q2))*(kMw2/(kMw2+Q2))/E_nu/kPi;
  return xsec;
 
 
}

References fFormFactors, genie::PDGLibrary::Find(), genie::Interaction::FSPrimLepton(), fVud2, genie::Target::HitNucMass(), genie::Target::HitNucPdg(), genie::PDGLibrary::Instance(), genie::pdg::IsNeutrino(), genie::constants::kGF2, genie::kKVPn, genie::kKVQ2, genie::kKVv, genie::constants::kMw2, genie::constants::kNucleonMass, genie::constants::kNucleonMass2, genie::constants::kPi, genie::kRfLab, genie::Target::Mass(), genie::InitialState::ProbeE(), genie::InitialState::ProbePdg(), genie::SmithMonizUtils::rho(), sm_utils, genie::pdg::SwitchProtonNeutron(), and genie::InitialState::Tgt().

Referenced by d2sQES_dQ2dv_SM(), and XSec().

dsQES_dQ2_SM()

double SmithMonizQELCCPXSec::dsQES_dQ2_SM ( const Interaction * interaction ) const

private

Definition at line 407 of file SmithMonizQELCCPXSec.cxx.

{
  // Get kinematics & init-state parameters
  const Kinematics &   kinematics = interaction -> Kine();
  const InitialState & init_state = interaction -> InitState();
  const Target & target = init_state.Tgt();
 
  double E  = init_state.ProbeE(kRfHitNucRest);
  double E2 = TMath::Power(E,2);
  double ml = interaction->FSPrimLepton()->Mass();
  double M  = target.HitNucMass();
  double q2 = kinematics.q2();
 
  // One of the xsec terms changes sign for antineutrinos
  bool is_neutrino = pdg::IsNeutrino(init_state.ProbePdg());
  int sign = (is_neutrino) ? -1 : 1;
 
  // Calculate the QEL form factors
  fFormFactors.Calculate(interaction);
 
  double F1V   = fFormFactors.F1V();
  double xiF2V = fFormFactors.xiF2V();
  double FA    = fFormFactors.FA();
  double Fp    = fFormFactors.Fp();
 
 
  // Calculate auxiliary parameters
  double ml2     = TMath::Power(ml,    2);
  double M2      = TMath::Power(M,     2);
  double M4      = TMath::Power(M2,    2);
  double FA2     = TMath::Power(FA,    2);
  double Fp2     = TMath::Power(Fp,    2);
  double F1V2    = TMath::Power(F1V,   2);
  double xiF2V2  = TMath::Power(xiF2V, 2);
  double Gfactor = M2*kGF2*fVud2*(kMw2/(kMw2-q2))*(kMw2/(kMw2-q2)) / (8*kPi*E2);
  double s_u     = 4*E*M + q2 - ml2;
  double q2_M2   = q2/M2;
 
  // Compute free nucleon differential cross section
  double A = (0.25*(ml2-q2)/M2) * (
         (4-q2_M2)*FA2 - (4+q2_M2)*F1V2 - q2_M2*xiF2V2*(1+0.25*q2_M2)
              -4*q2_M2*F1V*xiF2V - (ml2/M2)*(
               (F1V2+xiF2V2+2*F1V*xiF2V)+(FA2+4*Fp2+4*FA*Fp)+(q2_M2-4)*Fp2));
  double B = -1 * q2_M2 * FA*(F1V+xiF2V);
  double C = 0.25*(FA2 + F1V2 - 0.25*q2_M2*xiF2V2);
 
  double xsec = Gfactor * (A + sign*B*s_u/M2 + C*s_u*s_u/M4);
 
  // Apply given scaling factor
  xsec *= fXSecScale;
 
  // Pauli-correction factor for deuterium, we formally apply this factor for He-3 and tritium, 
  // because RFG model is not applicable for them. 
  if (1<target.A() && target.A()<4)
  {
    double Q2 = -q2;
    double fQES_Pauli = 1.0-0.529*TMath::Exp((Q2*(228.0-531.0*Q2)-48.0)*Q2);
    xsec *= fQES_Pauli;
  }
 
  int nucpdgc = target.HitNucPdg();
  int NNucl = (pdg::IsProton(nucpdgc)) ? target.Z() : target.N();
 
  xsec *= NNucl; // nuclear xsec
 
  // Apply radiative correction to the cross section for IBD processes
  // Refs:
  // 1) I.S. Towner, Phys. Rev. C 58 (1998) 1288;
  // 2) J.F. Beacom, S.J. Parke, Phys. Rev. D 64 (2001) 091302;
  // 3) A. Kurylov, M.J. Ramsey-Musolf, P. Vogel, Phys. Rev. C 65 (2002) 055501;
  // 4) A. Kurylov, M.J. Ramsey-Musolf, P. Vogel, Phys. Rev. C 67 (2003) 035502.
  double rc = 1.0;
  if ( (target.IsProton() && pdg::IsAntiNuE(init_state.ProbePdg())) || (target.IsNeutron() && pdg::IsNuE(init_state.ProbePdg()) ))
  {
    const double mp  = kProtonMass;
    const double mp2 = kProtonMass2;
    const double mn2 = kNeutronMass2;
    const double Ee  = E + ( (q2 - mn2 + mp2) / 2.0 / mp );
    assert(Ee > 0.0); // must be non-zero and positive
    rc  = 6.0 + (1.5 * TMath::Log(kProtonMass / 2.0 / Ee));
    rc += 1.2 * TMath::Power((kElectronMass / Ee), 1.5);
    rc *= kAem / kPi;
    rc += 1.0;
  }
 
  xsec *= rc;
  return xsec;
}

References genie::Target::A(), fFormFactors, genie::Interaction::FSPrimLepton(), fVud2, fXSecScale, genie::Target::HitNucMass(), genie::Target::HitNucPdg(), genie::pdg::IsAntiNuE(), genie::pdg::IsNeutrino(), genie::Target::IsNeutron(), genie::pdg::IsNuE(), genie::pdg::IsProton(), genie::Target::IsProton(), genie::constants::kAem, genie::constants::kElectronMass, genie::constants::kGF2, genie::constants::kMw2, genie::constants::kNeutronMass2, genie::constants::kPi, genie::constants::kProtonMass, genie::constants::kProtonMass2, genie::kRfHitNucRest, genie::Target::N(), genie::InitialState::ProbeE(), genie::InitialState::ProbePdg(), genie::InitialState::Tgt(), and genie::Target::Z().

Referenced by XSec().

Integral()

double SmithMonizQELCCPXSec::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 125 of file SmithMonizQELCCPXSec.cxx.

{
  return fXSecIntegrator->Integrate(this,in);
 
}

References fXSecIntegrator.

LoadConfig()

void SmithMonizQELCCPXSec::LoadConfig ( void )

private

Definition at line 172 of file SmithMonizQELCCPXSec.cxx.

{
 
  // Cross section scaling factor
  GetParamDef( "QEL-CC-XSecScale", fXSecScale, 1. ) ;
 
  double Vud;
  GetParam( "CKM-Vud", Vud ) ;
  fVud2 = TMath::Power( Vud, 2 );
 
   // load QEL form factors model
  fFormFactorsModel = dynamic_cast<const QELFormFactorsModelI *> (
                                             this->SubAlg("FormFactorsAlg"));
  assert(fFormFactorsModel);
  fFormFactors.SetModel(fFormFactorsModel); // <-- attach algorithm
 
   // load XSec Integrators
  fXSecIntegrator =
      dynamic_cast<const XSecIntegratorI *> (this->SubAlg("XSec-Integrator"));
  assert(fXSecIntegrator);
 
  sm_utils = const_cast<genie::SmithMonizUtils *>(
               dynamic_cast<const genie::SmithMonizUtils *>(
                 this -> SubAlg( "sm_utils_algo" ) ) ) ;
 
}

References fFormFactors, fFormFactorsModel, fVud2, fXSecIntegrator, fXSecScale, genie::Algorithm::GetParam(), genie::Algorithm::GetParamDef(), sm_utils, and genie::Algorithm::SubAlg().

Referenced by Configure(), and Configure().

ValidProcess()

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

virtual

Can this cross section algorithm handle the input process?

Implements genie::XSecAlgorithmI.

Definition at line 131 of file SmithMonizQELCCPXSec.cxx.

{
  if(interaction->TestBit(kISkipProcessChk)) return true;
 
  const InitialState & init_state = interaction->InitState();
  const ProcessInfo &  proc_info  = interaction->ProcInfo();
 
  if(!proc_info.IsQuasiElastic()) return false;
 
  int  nuc = init_state.Tgt().HitNucPdg();
  int  nu  = init_state.ProbePdg();
 
  bool isP   = pdg::IsProton(nuc);
  bool isN   = pdg::IsNeutron(nuc);
  bool isnu  = pdg::IsNeutrino(nu);
  bool isnub = pdg::IsAntiNeutrino(nu);
 
  bool prcok = proc_info.IsWeakCC() && ((isP&&isnub) || (isN&&isnu));
  if(!prcok) return false;
 
  return true;
}

References genie::Target::HitNucPdg(), genie::Interaction::InitState(), genie::pdg::IsAntiNeutrino(), genie::pdg::IsNeutrino(), genie::pdg::IsNeutron(), genie::pdg::IsProton(), genie::ProcessInfo::IsQuasiElastic(), genie::ProcessInfo::IsWeakCC(), genie::kISkipProcessChk, genie::InitialState::ProbePdg(), genie::Interaction::ProcInfo(), and genie::InitialState::Tgt().

Referenced by XSec().

XSec()

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

virtual

Compute the cross section for the input interaction.

Implements genie::XSecAlgorithmI.

Definition at line 72 of file SmithMonizQELCCPXSec.cxx.

{
  double xsec = 0. ;
  // dimension of kine phase space
  std::string s = KinePhaseSpace::AsString(kps);
  int kpsdim = s!="<|E>"?1 + std::count(s.begin(), s.begin()+s.find('}'), ','):0;
  
  if(!this -> ValidProcess (interaction) )
  {
    LOG("SmithMoniz",pWARN) << "not a valid process";
    return 0.;
  }
 
  if(kpsdim == 1)
  {
     if(! this -> ValidKinematics (interaction) )
     {
        LOG("SmithMoniz",pWARN) << "not valid kinematics";
        return 0.;
     }
     xsec = this->dsQES_dQ2_SM(interaction);
  }
 
  if(kpsdim == 2) 
  {
    xsec = this->d2sQES_dQ2dv_SM(interaction);
  }
  
  if(kpsdim == 3) 
  {
    xsec = this->d3sQES_dQ2dvdkF_SM(interaction);
  }
 
  
  // The algorithm computes d^1xsec/dQ2, d^2xsec/dQ2dv or d^3xsec/dQ2dvdp
  // Check whether variable tranformation is needed
  if ( kps != kPSQ2fE && kps != kPSQ2vfE ) 
  {
     double J = 1.;
     if (kpsdim == 1)
       J = utils::kinematics::Jacobian(interaction, kPSQ2fE, kps);
     else if (kpsdim == 2)
       J = utils::kinematics::Jacobian(interaction, kPSQ2vfE, kps);
     else if (kpsdim == 3)
       J = utils::kinematics::Jacobian(interaction, kPSQ2vpfE, kps);
     xsec *= J;
  }
 
  return xsec;
 
}

References genie::KinePhaseSpace::AsString(), d2sQES_dQ2dv_SM(), d3sQES_dQ2dvdkF_SM(), dsQES_dQ2_SM(), genie::utils::kinematics::Jacobian(), genie::kPSQ2fE, genie::kPSQ2vfE, genie::kPSQ2vpfE, LOG, pWARN, genie::XSecAlgorithmI::ValidKinematics(), and ValidProcess().

Member Data Documentation

fFormFactors

QELFormFactors genie::SmithMonizQELCCPXSec::fFormFactors

mutableprivate

Definition at line 78 of file SmithMonizQELCCPXSec.h.

Referenced by d3sQES_dQ2dvdkF_SM(), dsQES_dQ2_SM(), and LoadConfig().

fFormFactorsModel

const QELFormFactorsModelI* genie::SmithMonizQELCCPXSec::fFormFactorsModel

private

Definition at line 79 of file SmithMonizQELCCPXSec.h.

Referenced by LoadConfig().

fVud2

double genie::SmithMonizQELCCPXSec::fVud2

private

|Vud|^2(square of magnitude ud-element of CKM-matrix)

Definition at line 81 of file SmithMonizQELCCPXSec.h.

Referenced by d3sQES_dQ2dvdkF_SM(), dsQES_dQ2_SM(), and LoadConfig().

fXSecIntegrator

const XSecIntegratorI* genie::SmithMonizQELCCPXSec::fXSecIntegrator

private

Definition at line 80 of file SmithMonizQELCCPXSec.h.

Referenced by Integral(), and LoadConfig().

fXSecScale

double genie::SmithMonizQELCCPXSec::fXSecScale

private

external xsec scaling factor

Definition at line 77 of file SmithMonizQELCCPXSec.h.

Referenced by d2sQES_dQ2dv_SM(), dsQES_dQ2_SM(), and LoadConfig().

sm_utils

SmithMonizUtils* genie::SmithMonizQELCCPXSec::sm_utils

mutableprivate

Definition at line 70 of file SmithMonizQELCCPXSec.h.

Referenced by d2sQES_dQ2dv_SM(), d3sQES_dQ2dvdkF_SM(), and LoadConfig().

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

• SmithMonizQELCCPXSec.h
• SmithMonizQELCCPXSec.cxx