genie::QPMDISStrucFuncBase Class Reference

Abstract base class. Provides common implementation for concrete objects implementing the DISStructureFuncModelI interface. More...

#include <QPMDISStrucFuncBase.h>

Inheritance diagram for genie::QPMDISStrucFuncBase:

Collaboration diagram for genie::QPMDISStrucFuncBase:

Public Member Functions
virtual	~QPMDISStrucFuncBase ()
virtual double	F1 (void) const
	Get the computed structure function F1. More...
virtual double	F2 (void) const
	Get the computed structure function F2. More...
virtual double	F3 (void) const
	Get the computed structure function F3. More...
virtual double	F4 (void) const
	Get the computed structure function F4. More...
virtual double	F5 (void) const
	Get the computed structure function F5. More...
virtual double	F6 (void) const
	Get the computed structure function F6. More...
virtual void	Calculate (const Interaction *interaction) const
	Calculate the structure functions F1-F6 for the input interaction. More...
void	Configure (const Registry &config)
void	Configure (string param_set)
Public Member Functions inherited from genie::DISStructureFuncModelI
virtual	~DISStructureFuncModelI ()
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...

Protected Member Functions
	QPMDISStrucFuncBase ()
	QPMDISStrucFuncBase (string name)
	QPMDISStrucFuncBase (string name, string config)
virtual void	LoadConfig (void)
virtual void	InitPDF (void)
virtual double	Q2 (const Interaction *i) const
virtual double	ScalingVar (const Interaction *i) const
virtual void	CalcPDFs (const Interaction *i) const
virtual double	NuclMod (const Interaction *i) const
virtual double	R (const Interaction *i) const
virtual void	KFactors (const Interaction *i, double &kuv, double &kdv, double &kus, double &kds) const
Protected Member Functions inherited from genie::DISStructureFuncModelI
	DISStructureFuncModelI ()
	DISStructureFuncModelI (string name)
	DISStructureFuncModelI (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
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. More...
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 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
double	fQ2min
	min Q^2 allowed for PDFs: PDF(Q2<Q2min):=PDF(Q2min) More...
bool	fCharmOff
	turn charm production off? More...
bool	fIncludeR
	include R (~FL) in DIS SF calculation? More...
bool	fIncludeNuclMod
	include nuclear factor (shadowing, anti-shadowing,...)? More...
double	fMc
	charm mass used More...
double	fVcd
	CKM element Vcd used. More...
double	fVcs
	CKM element Vcs used. More...
double	fVud
	CKM element Vud used. More...
double	fVus
	CKM element Vcs used. More...
double	fVcd2
double	fVcs2
double	fVud2
double	fVus2
double	fSin2thw
bool	fUse2016Corrections
	Use 2016 SF relation corrections. More...
double	fLowQ2CutoffF1F2
	Set min for relation between 2xF1 and F2. More...
double	fF1
double	fF2
double	fF3
double	fF4
double	fF5
double	fF6
PDF *	fPDF
	computed PDFs @ (x,Q2) More...
PDF *	fPDFc
	computed PDFs @ (slow-rescaling-var,Q2) More...
double	fuv
double	fus
double	fdv
double	fds
double	fs
double	fc
double	fuv_c
double	fus_c
double	fdv_c
double	fds_c
double	fs_c
double	fc_c
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...

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)

Detailed Description

Abstract base class. Provides common implementation for concrete objects implementing the DISStructureFuncModelI interface.

References:

For a discussion of DIS SF see for example E.A.Paschos and J.Y.Yu, Phys.Rev.D 65.033002 and R.Devenish and A.Cooper-Sarkar, OUP 2004.

Author

Costas Andreopoulos <c.andreopoulos cern.ch> University of Liverpool

Adapted from neugen 3. Primary authors: D.Naples (Pittsburgh U.), H.Gallagher (Tufts U), CA (RAL)

Created:

May 03, 2004

License:

Copyright (c) 2003-2024, The GENIE Collaboration For the full text of the license visit http://copyright.genie-mc.org

Definition at line 36 of file QPMDISStrucFuncBase.h.

Constructor & Destructor Documentation

QPMDISStrucFuncBase::~QPMDISStrucFuncBase ( )

virtual

Definition at line 62 of file QPMDISStrucFuncBase.cxx.

References fPDF, and fPDFc.

{
  delete fPDF;
  delete fPDFc;
}

QPMDISStrucFuncBase::QPMDISStrucFuncBase ( )

protected

Definition at line 44 of file QPMDISStrucFuncBase.cxx.

References InitPDF().

                                         :
DISStructureFuncModelI()
{
  this->InitPDF();
}

QPMDISStrucFuncBase::QPMDISStrucFuncBase ( string  name )

protected

Definition at line 50 of file QPMDISStrucFuncBase.cxx.

References InitPDF().

                                                    :
DISStructureFuncModelI(name)
{
  this->InitPDF();
}

QPMDISStrucFuncBase::QPMDISStrucFuncBase ( string  name, string  config  )

protected

Definition at line 56 of file QPMDISStrucFuncBase.cxx.

References InitPDF().

                                                                  :
DISStructureFuncModelI(name, config)
{
  this->InitPDF();
}

Member Function Documentation

void QPMDISStrucFuncBase::CalcPDFs ( const Interaction *  i ) const

protectedvirtual

Definition at line 495 of file QPMDISStrucFuncBase.cxx.

References genie::PDF::Calculate(), fc, fc_c, fCharmOff, fds, fds_c, fdv, fdv_c, fMc, fPDF, fPDFc, fQ2min, fs, fs_c, fus, fus_c, fuv, fuv_c, genie::Target::HitNucP4(), genie::Target::HitNucPdg(), genie::Interaction::InitState(), genie::utils::kinematics::IsAboveCharmThreshold(), genie::pdg::IsNeutron(), genie::pdg::IsProton(), KFactors(), LOG, pDEBUG, pINFO, Q2(), genie::PDF::ScaleCharm(), genie::PDF::ScaleDownSea(), genie::PDF::ScaleDownValence(), genie::PDF::ScaleStrange(), genie::PDF::ScaleUpSea(), genie::PDF::ScaleUpValence(), ScalingVar(), genie::utils::kinematics::SlowRescalingVar(), and genie::InitialState::Tgt().

Referenced by Calculate().

{
  // Clean-up previous calculation
  fPDF  -> Reset();
  fPDFc -> Reset();

  // Get the kinematical variables x,Q2 (could include corrections)
  double x     = this->ScalingVar(interaction);
  double Q2val = this->Q2(interaction);

  // Get the hit nucleon mass (could be off-shell)
  const Target & tgt = interaction->InitState().Tgt();
  double M = tgt.HitNucP4().M();

  // Get the Q2 for which PDFs will be evaluated
  double Q2pdf = TMath::Max(Q2val, fQ2min);

  // Compute PDFs at (x,Q2)
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  LOG("DISSF", pDEBUG) << "Calculating PDFs @ x = " << x << ", Q2 = " << Q2pdf;
#endif
  fPDF->Calculate(x, Q2pdf);

  // Check whether it is above charm threshold
  bool above_charm =
           utils::kinematics::IsAboveCharmThreshold(x, Q2val, M, fMc);
  if(above_charm) {
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
    LOG("DISSF", pDEBUG)
      << "The event is above the charm threshold (mcharm = " << fMc << ")";
#endif
    if(fCharmOff) {
       LOG("DISSF", pINFO) << "Charm production is turned off";
    } else {
       // compute the slow rescaling var
       double xc = utils::kinematics::SlowRescalingVar(x, Q2val, M, fMc);
       if(xc<0 || xc>1) {
          LOG("DISSF", pINFO) << "Unphys. slow rescaling var: xc = " << xc;
       } else {
          // compute PDFs at (xc,Q2)
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
          LOG("DISSF", pDEBUG)
              << "Calculating PDFs @ xc (slow rescaling) = " << x << ", Q2 = " << Q2val;
#endif
          fPDFc->Calculate(xc, Q2pdf);
       }
    }// charm off?
  }//above charm thr?
  else {
    LOG("DISSF", pDEBUG)
     << "The event is below the charm threshold (mcharm = " << fMc << ")";
  }

  // Compute the K factors
  double kval_u = 1.;
  double kval_d = 1.;
  double ksea_u = 1.;
  double ksea_d = 1.;

  this->KFactors(interaction, kval_u, kval_d, ksea_u, ksea_d);

#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  LOG("DISSF", pDEBUG) << "K-Factors:";
  LOG("DISSF", pDEBUG) << "U: Kval = " << kval_u << ", Ksea = " << ksea_u;
  LOG("DISSF", pDEBUG) << "D: Kval = " << kval_d << ", Ksea = " << ksea_d;
#endif

  // Apply the K factors
  //
  // Always scale d pdfs with d kfactors and u pdfs with u kfactors.
  // Don't swap the applied kfactors for neutrons.
  // Debdatta & Donna noted (Sep.2006) that a similar swap in the neugen
  // implementation was the cause of the difference in nu and nubar F2
  //
  fPDF->ScaleUpValence   (kval_u);
  fPDF->ScaleDownValence (kval_d);
  fPDF->ScaleUpSea       (ksea_u);
  fPDF->ScaleDownSea     (ksea_d);
  fPDF->ScaleStrange     (ksea_d);
  fPDF->ScaleCharm       (ksea_u);
  if(above_charm) {
     fPDFc->ScaleUpValence   (kval_u);
     fPDFc->ScaleDownValence (kval_d);
     fPDFc->ScaleUpSea       (ksea_u);
     fPDFc->ScaleDownSea     (ksea_d);
     fPDFc->ScaleStrange     (ksea_d);
     fPDFc->ScaleCharm       (ksea_u);
  }

  // Rules of thumb
  // ---------------------------------------
  // - For W+ exchange use: -1/3|e| quarks and -2/3|e| antiquarks
  // - For W- exchange use:  2/3|e| quarks and  1/3|e| antiquarks
  // - For each qi -> qj transition multiply with the (ij CKM element)^2
  // - Use isospin symmetry to get neutron's u,d from proton's u,d
  //    -- neutron d = proton u
  //    -- neutron u = proton d
  // - Use u = usea + uvalence. Same for d
  // - For s,c use q=qbar
  // - For t,b use q=qbar=0

  fuv   = fPDF  -> UpValence();
  fus   = fPDF  -> UpSea();
  fdv   = fPDF  -> DownValence();
  fds   = fPDF  -> DownSea();
  fs    = fPDF  -> Strange();
  fc    = 0.;
  fuv_c = fPDFc -> UpValence();   // will be 0 if < charm threshold
  fus_c = fPDFc -> UpSea();       // ...
  fdv_c = fPDFc -> DownValence(); // ...
  fds_c = fPDFc -> DownSea();     // ...
  fs_c  = fPDFc -> Strange();     // ...
  fc_c  = fPDFc -> Charm();       // ...

  // The above are the proton parton density function. Get the PDFs for the
  // hit nucleon (p or n) by swapping u<->d if necessary

  int nuc_pdgc = tgt.HitNucPdg();
  bool isP = pdg::IsProton  (nuc_pdgc);
  bool isN = pdg::IsNeutron (nuc_pdgc);
  assert(isP  || isN);

  double tmp = 0;
  if (isN) {  // swap u <-> d
    tmp = fuv;   fuv   = fdv;   fdv   = tmp;
    tmp = fus;   fus   = fds;   fds   = tmp;
    tmp = fuv_c; fuv_c = fdv_c; fdv_c = tmp;
    tmp = fus_c; fus_c = fds_c; fds_c = tmp;
  }

}

void QPMDISStrucFuncBase::Calculate ( const Interaction *  interaction ) const

virtual

Calculate the structure functions F1-F6 for the input interaction.

Implements genie::DISStructureFuncModelI.

Definition at line 137 of file QPMDISStrucFuncBase.cxx.

References a, CalcPDFs(), fc, fc_c, fds, fds_c, fdv, fdv_c, fF1, fF2, fF3, fF4, fF5, fF6, fLowQ2CutoffF1F2, fs, fs_c, fSin2thw, fus, fUse2016Corrections, fuv, fVcd2, fVcs2, fVud2, fVus2, genie::Target::HitNucPdg(), genie::Target::HitQrkIsSet(), genie::Target::HitQrkPdg(), genie::Target::HitSeaQrk(), genie::Interaction::InitState(), genie::pdg::IsAntiCQuark(), genie::pdg::IsAntiDQuark(), genie::pdg::IsAntiNeutrino(), genie::pdg::IsAntiSQuark(), genie::pdg::IsAntiUQuark(), genie::pdg::IsChargedLepton(), genie::pdg::IsCQuark(), genie::pdg::IsDarkMatter(), genie::ProcessInfo::IsDarkMatter(), genie::pdg::IsDQuark(), genie::ProcessInfo::IsEM(), genie::pdg::IsLepton(), genie::pdg::IsNeutrino(), genie::pdg::IsNeutron(), genie::pdg::IsProton(), genie::pdg::IsSQuark(), genie::pdg::IsUQuark(), genie::ProcessInfo::IsWeakCC(), genie::ProcessInfo::IsWeakNC(), genie::Interaction::Kine(), genie::constants::kNucleonMass2, LOG, genie::Target::N(), NuclMod(), pDEBUG, pINFO, genie::InitialState::ProbePdg(), genie::Interaction::ProcInfo(), Q2(), R(), ScalingVar(), genie::InitialState::Tgt(), genie::Kinematics::x(), and genie::Target::Z().

{
  // Reset mutable members
  fF1 = 0;
  fF2 = 0;
  fF3 = 0;
  fF4 = 0;
  fF5 = 0;
  fF6 = 0;

  // Get process info & perform various checks
  const ProcessInfo &  proc_info  = interaction->ProcInfo();
  const InitialState & init_state = interaction->InitState();
  const Target & tgt = init_state.Tgt();

  int  nuc_pdgc    = tgt.HitNucPdg();
  int  probe_pdgc  = init_state.ProbePdg();
  bool is_p        = pdg::IsProton       ( nuc_pdgc    );
  bool is_n        = pdg::IsNeutron      ( nuc_pdgc    );
  bool is_nu       = pdg::IsNeutrino     ( probe_pdgc  );
  bool is_nubar    = pdg::IsAntiNeutrino ( probe_pdgc  );
  bool is_lepton   = pdg::IsLepton       ( probe_pdgc  );
  bool is_dm       = pdg::IsDarkMatter   ( probe_pdgc  );
  bool is_CC       = proc_info.IsWeakCC();
  bool is_NC       = proc_info.IsWeakNC();
  bool is_EM       = proc_info.IsEM();
  bool is_dmi      = proc_info.IsDarkMatter();

  if ( !is_lepton && !is_dm ) return;
  if ( !is_p && !is_n       ) return;
  if ( tgt.N() == 0 && is_n ) return;
  if ( tgt.Z() == 0 && is_p ) return;

  // Flags switching on/off quark contributions so that this algorithm can be
  // used for both l + N -> l' + X, and l + q -> l' + q' level calculations

  double switch_uv    = 1.;
  double switch_us    = 1.;
  double switch_ubar  = 1.;
  double switch_dv    = 1.;
  double switch_ds    = 1.;
  double switch_dbar  = 1.;
  double switch_s     = 1.;
  double switch_sbar  = 1.;
  double switch_c     = 1.;
  double switch_cbar  = 1.;

  if(tgt.HitQrkIsSet()) {

     switch_uv    = 0.;
     switch_us    = 0.;
     switch_ubar  = 0.;
     switch_dv    = 0.;
     switch_ds    = 0.;
     switch_dbar  = 0.;
     switch_s     = 0.;
     switch_sbar  = 0.;
     switch_c     = 0.;
     switch_cbar  = 0.;

     int  qpdg = tgt.HitQrkPdg();
     bool sea  = tgt.HitSeaQrk();

     bool is_u    = pdg::IsUQuark     (qpdg);
     bool is_ubar = pdg::IsAntiUQuark (qpdg);
     bool is_d    = pdg::IsDQuark     (qpdg);
     bool is_dbar = pdg::IsAntiDQuark (qpdg);
     bool is_s    = pdg::IsSQuark     (qpdg);
     bool is_sbar = pdg::IsAntiSQuark (qpdg);
     bool is_c    = pdg::IsCQuark     (qpdg);
     bool is_cbar = pdg::IsAntiCQuark (qpdg);

     if      (!sea && is_u   ) { switch_uv   = 1; }
     else if ( sea && is_u   ) { switch_us   = 1; }
     else if ( sea && is_ubar) { switch_ubar = 1; }
     else if (!sea && is_d   ) { switch_dv   = 1; }
     else if ( sea && is_d   ) { switch_ds   = 1; }
     else if ( sea && is_dbar) { switch_dbar = 1; }
     else if ( sea && is_s   ) { switch_s    = 1; }
     else if ( sea && is_sbar) { switch_sbar = 1; }
     else if ( sea && is_c   ) { switch_c    = 1; }
     else if ( sea && is_cbar) { switch_cbar = 1; }
     else return;

     // make sure user inputs make sense
    if(is_nu    && is_CC && is_u   ) return;
    if(is_nu    && is_CC && is_c   ) return;
    if(is_nu    && is_CC && is_dbar) return;
    if(is_nu    && is_CC && is_sbar) return;
    if(is_nubar && is_CC && is_ubar) return;
    if(is_nubar && is_CC && is_cbar) return;
    if(is_nubar && is_CC && is_d   ) return;
    if(is_nubar && is_CC && is_s   ) return;
  }

  // Compute PDFs [both at (scaling-var,Q2) and (slow-rescaling-var,Q2)
  // Applying all PDF K-factors abd scaling variable corrections

  this -> CalcPDFs (interaction);

  //
  // Compute structure functions for the EM, NC and CC cases
  //

  double F2val=0, xF3val=0;

  // ***  NEUTRAL CURRENT

  // Include DM in NC
  if(is_NC || is_dmi) {

    if(!is_nu && !is_nubar && !is_dm) return;

    double GL   = (is_nu) ? ( 0.5 - (2./3.)*fSin2thw) : (     - (2./3.)*fSin2thw); // clu
    double GR   = (is_nu) ? (     - (2./3.)*fSin2thw) : ( 0.5 - (2./3.)*fSin2thw); // cru
    double GLp  = (is_nu) ? (-0.5 + (1./3.)*fSin2thw) : (       (1./3.)*fSin2thw); // cld
    double GRp  = (is_nu) ? (       (1./3.)*fSin2thw) : (-0.5 + (1./3.)*fSin2thw); // crd
    // Set the couplings to up and down quarks to be axial for DM
    if (is_dm) {
      GL  = -1.;
      GR  =  1.;
      GLp = -1.;
      GRp =  1.;
    }
    double gvu  = GL  + GR;
    double gau  = GL  - GR;
    double gvd  = GLp + GRp;
    double gad  = GLp - GRp;
    double gvu2 = TMath::Power(gvu, 2.);
    double gau2 = TMath::Power(gau, 2.);
    double gvd2 = TMath::Power(gvd, 2.);
    double gad2 = TMath::Power(gad, 2.);

    double q2   = (switch_uv   * fuv + switch_us   * fus + switch_c    * fc)  * (gvu2+gau2) +
                  (switch_dv   * fdv + switch_ds   * fds + switch_s    * fs)  * (gvd2+gad2);
    double q3   = (switch_uv   * fuv + switch_us   * fus + switch_c    * fc)  * (2*gvu*gau) +
                  (switch_dv   * fdv + switch_ds   * fds + switch_s    * fs)  * (2*gvd*gad);

    double qb2  = (switch_ubar * fus + switch_cbar * fc)  * (gvu2+gau2) +
                  (switch_dbar * fds + switch_sbar * fs)  * (gvd2+gad2);
    double qb3  = (switch_ubar * fus + switch_cbar * fc)  * (2*gvu*gau) +
                  (switch_dbar * fds + switch_sbar * fs)  * (2*gvd*gad);

#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
    LOG("DISSF", pINFO) << "f2 : q = " << q2 << ", bar{q} = " << qb2;
    LOG("DISSF", pINFO) << "xf3: q = " << q3 << ", bar{q} = " << qb3;
#endif

    F2val  = q2+qb2;
    xF3val = q3-qb3;
  }

  // ***  CHARGED CURRENT

  if(is_CC) {
    double q=0, qbar=0;

    if (is_nu) {
      q    = ( switch_dv * fdv   + switch_ds * fds   ) * fVud2 +
             ( switch_s  * fs                        ) * fVus2 +
             ( switch_dv * fdv_c + switch_ds * fds_c ) * fVcd2 +
             ( switch_s  * fs_c                      ) * fVcs2;

      qbar = ( switch_ubar * fus  ) * fVud2 +
             ( switch_ubar * fus  ) * fVus2 +
             ( switch_cbar * fc_c ) * fVcd2 +
             ( switch_cbar * fc_c ) * fVcs2;
    }
    else
    if (is_nubar) {
      q    = ( switch_uv * fuv + switch_us * fus    ) * fVud2 +
             ( switch_uv * fuv + switch_us * fus    ) * fVus2 +
             ( switch_c  * fc_c                     ) * fVcd2 +
             ( switch_c  * fc_c                     ) * fVcs2;

      qbar = ( switch_dbar * fds_c ) * fVcd2 +
             ( switch_dbar * fds   ) * fVud2 +
             ( switch_sbar * fs    ) * fVus2 +
             ( switch_sbar * fs_c  ) * fVcs2;
    }
    else {
      return;
    }

    F2val  = 2*(q+qbar);
    xF3val = 2*(q-qbar);
  }

  // ***  ELECTROMAGNETIC

  if(is_EM) {

    if(!pdg::IsChargedLepton(probe_pdgc)) return;

    double sq23 = TMath::Power(2./3., 2.);
    double sq13 = TMath::Power(1./3., 2.);

    double qu   = sq23 * ( switch_uv   * fuv + switch_us * fus );
    double qd   = sq13 * ( switch_dv   * fdv + switch_ds * fds );
    double qs   = sq13 * ( switch_s    * fs  );
    double qbu  = sq23 * ( switch_ubar * fus );
    double qbd  = sq13 * ( switch_dbar * fds );
    double qbs  = sq13 * ( switch_sbar * fs  );

    double q    = qu  + qd  + qs;
    double qbar = qbu + qbd + qbs;

    F2val  = q + qbar;;
    xF3val = 0.;

  }

  double Q2val = this->Q2        (interaction);
  double x     = this->ScalingVar(interaction);
  double f     = this->NuclMod   (interaction); // nuclear modification
  double r     = this->R         (interaction); // R ~ FL

#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  LOG("DISSF", pDEBUG) << "Nucl. mod   = " << f;
  LOG("DISSF", pDEBUG) << "R(=FL/2xF1) = " << r;
#endif

  if(fUse2016Corrections) {
    //It was confirmed by A.Bodek that the modified scaling variable
    //should just be used to compute the strucure functions F2 and xF3,
    //but that the usual Bjorken x should be used for the relations
    //between the structure functions.
    //For the same reason remove the freezing of Q2 at 0.8 for those relations,
    //although it has not been explicitly asked to A.Bodek if it should be done.

    const Kinematics & kinematics = interaction->Kine();
    double bjx = kinematics.x();

    double a = TMath::Power(bjx,2.) / TMath::Max(Q2val, fLowQ2CutoffF1F2);
    double c = (1. + 4. * kNucleonMass2 * a) / (1.+r);

    fF3 = f * xF3val/bjx;
    fF2 = f * F2val;
    fF1 = fF2 * 0.5*c/bjx;
    fF5 = fF2/bjx;           // Albright-Jarlskog relation
    fF4 = 0.;                // Nucl.Phys.B 84, 467 (1975)
  }
  else {
    double a = TMath::Power(x,2.) / TMath::Max(Q2val, fLowQ2CutoffF1F2);
    double c = (1. + 4. * kNucleonMass2 * a) / (1.+r);
    //double a = TMath::Power(x,2.) / Q2val;
    //double c = (1. + 4. * kNucleonMass * a) / (1.+r);

    fF3 = f * xF3val / x;
    fF2 = f * F2val;
    fF1 = fF2 * 0.5 * c / x;
    fF5 = fF2 / x;         // Albright-Jarlskog relation
    fF4 = 0.;              // Nucl.Phys.B 84, 467 (1975)
  }

#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
  LOG("DISSF", pDEBUG)
     << "F1-F5 = "
     << fF1 << ", " << fF2 << ", " << fF3 << ", " << fF4 << ", " << fF5;
#endif
}

void QPMDISStrucFuncBase::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 68 of file QPMDISStrucFuncBase.cxx.

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

Referenced by genie::BYStrucFunc::Configure().

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

void QPMDISStrucFuncBase::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 74 of file QPMDISStrucFuncBase.cxx.

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

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

virtual double genie::QPMDISStrucFuncBase::F1 ( void  ) const

inlinevirtual

Get the computed structure function F1.

Implements genie::DISStructureFuncModelI.

Definition at line 42 of file QPMDISStrucFuncBase.h.

References fF1.

{ return fF1; }

virtual double genie::QPMDISStrucFuncBase::F2 ( void  ) const

inlinevirtual

Get the computed structure function F2.

Implements genie::DISStructureFuncModelI.

Definition at line 43 of file QPMDISStrucFuncBase.h.

References fF2.

{ return fF2; }

virtual double genie::QPMDISStrucFuncBase::F3 ( void  ) const

inlinevirtual

Get the computed structure function F3.

Implements genie::DISStructureFuncModelI.

Definition at line 44 of file QPMDISStrucFuncBase.h.

References fF3.

{ return fF3; }

virtual double genie::QPMDISStrucFuncBase::F4 ( void  ) const

inlinevirtual

Get the computed structure function F4.

Implements genie::DISStructureFuncModelI.

Definition at line 45 of file QPMDISStrucFuncBase.h.

References fF4.

{ return fF4; }

virtual double genie::QPMDISStrucFuncBase::F5 ( void  ) const

inlinevirtual

Get the computed structure function F5.

Implements genie::DISStructureFuncModelI.

Definition at line 46 of file QPMDISStrucFuncBase.h.

References fF5.

{ return fF5; }

virtual double genie::QPMDISStrucFuncBase::F6 ( void  ) const

inlinevirtual

Get the computed structure function F6.

Implements genie::DISStructureFuncModelI.

Definition at line 47 of file QPMDISStrucFuncBase.h.

References fF6.

{ return fF6; }

void QPMDISStrucFuncBase::InitPDF ( void  )

protectedvirtual

Definition at line 130 of file QPMDISStrucFuncBase.cxx.

References fPDF, and fPDFc.

Referenced by QPMDISStrucFuncBase().

{
                     // evaluated at:
  fPDF  = new PDF(); //   x = computed (+/-corrections) scaling var, Q2
  fPDFc = new PDF(); //   x = computed charm slow re-scaling var,    Q2
}

void QPMDISStrucFuncBase::KFactors ( const Interaction *  i, double &  kuv, double &  kdv, double &  kus, double &  kds  ) const

protectedvirtual

Reimplemented in genie::BYStrucFunc.

Definition at line 434 of file QPMDISStrucFuncBase.cxx.

Referenced by CalcPDFs().

{
// This is an abstract class: no model-specific correction
// The PDF scaling variables are set to 1
// Override this method to compute model-dependent corrections

  kuv = 1.;
  kdv = 1.;
  kus = 1.;
  kds = 1.;
}

void QPMDISStrucFuncBase::LoadConfig ( void  )

protectedvirtual

Definition at line 80 of file QPMDISStrucFuncBase.cxx.

References fCharmOff, fIncludeNuclMod, fIncludeR, fLowQ2CutoffF1F2, fMc, fPDF, fPDFc, fQ2min, fSin2thw, fUse2016Corrections, fVcd, fVcd2, fVcs, fVcs2, fVud, fVud2, fVus, fVus2, genie::Algorithm::GetParam(), genie::Algorithm::GetParamDef(), LOG, pDEBUG, and genie::Algorithm::SubAlg().

Referenced by Configure().

{
  LOG("DISSF", pDEBUG) << "Loading configuration...";

  //-- pdf
  const PDFModelI * pdf_model =
         dynamic_cast<const PDFModelI *> (this->SubAlg("PDF-Set"));
  fPDF  -> SetModel(pdf_model);
  fPDFc -> SetModel(pdf_model);

  //-- get CKM elements
  GetParam( "CKM-Vcd", fVcd ) ;
  GetParam( "CKM-Vcs", fVcs ) ;
  GetParam( "CKM-Vud", fVud ) ;
  GetParam( "CKM-Vus", fVus ) ;

  fVcd2 = TMath::Power( fVcd, 2 );
  fVcs2 = TMath::Power( fVcs, 2 );
  fVud2 = TMath::Power( fVud, 2 );
  fVus2 = TMath::Power( fVus, 2 );

  //-- charm mass
  GetParam( "Charm-Mass", fMc ) ;

  //-- min Q2 for PDF evaluation
  GetParam( "PDF-Q2min", fQ2min ) ;

  //-- include R (~FL)?
  GetParam( "IncludeR", fIncludeR ) ;

  //-- include nuclear factor (shadowing / anti-shadowing / ...)
  GetParam( "IncludeNuclMod", fIncludeNuclMod ) ;

  //-- Use 2016 SF relation corrections
  GetParam( "Use2016Corrections", fUse2016Corrections ) ;

  //-- Set min for relation between 2xF1 and F2
  GetParam( "LowQ2CutoffF1F2", fLowQ2CutoffF1F2 ) ;

  //-- turn charm production off?
  GetParamDef( "Charm-Prod-Off", fCharmOff, false ) ;

  //-- weinberg angle
  double thw ;
  GetParam( "WeinbergAngle", thw ) ;
  fSin2thw = TMath::Power(TMath::Sin(thw), 2);

  LOG("DISSF", pDEBUG) << "Done loading configuration";
}

double QPMDISStrucFuncBase::NuclMod ( const Interaction *  i ) const

protectedvirtual

Definition at line 447 of file QPMDISStrucFuncBase.cxx.

References genie::Target::A(), genie::units::A, genie::utils::nuclear::DISNuclFactor(), fIncludeNuclMod, genie::Interaction::InitState(), genie::kIAssumeFreeNucleon, genie::Interaction::Kine(), genie::kINoNuclearCorrection, LOG, pDEBUG, genie::InitialState::Tgt(), and genie::Kinematics::x().

Referenced by Calculate().

{
// Nuclear modification to Fi
// The scaling variable can be overwritten to include corrections

  if( interaction->TestBit(kIAssumeFreeNucleon)   ) return 1.0;
  if( interaction->TestBit(kINoNuclearCorrection) ) return 1.0;

  double f = 1.;
  if(fIncludeNuclMod) {
     const Target & tgt  = interaction->InitState().Tgt();

//   The x used for computing the DIS Nuclear correction factor should be the
//   experimental x, not the rescaled x or off-shell-rest-frame version of x
//   (i.e. selected x).  Since we do not have access to experimental x at this
//   point in the calculation, just use selected x.
     const Kinematics & kine  = interaction->Kine();
     double x  = kine.x();
     int    A = tgt.A();
     f = utils::nuclear::DISNuclFactor(x,A);
#ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
     LOG("DISSF", pDEBUG) << "Nuclear factor for x of " << x << "  = " << f;
#endif
  }

  return f;
}

double QPMDISStrucFuncBase::Q2 ( const Interaction *  i ) const

protectedvirtual

Definition at line 399 of file QPMDISStrucFuncBase.cxx.

References genie::Target::HitNucP4Ptr(), genie::Interaction::InitState(), genie::Interaction::Kine(), genie::kKVQ2, genie::kKVq2, genie::kKVy, genie::kRfHitNucRest, genie::Kinematics::KVSet(), LOG, pERROR, genie::InitialState::ProbeE(), genie::Kinematics::Q2(), genie::InitialState::Tgt(), genie::Kinematics::x(), and genie::Kinematics::y().

Referenced by CalcPDFs(), Calculate(), genie::BYStrucFunc::KFactors(), R(), and genie::BYStrucFunc::ScalingVar().

{
// Return Q2 from the kinematics or, if not set, compute it from x,y
// The x might be corrected

  const Kinematics & kinematics = interaction->Kine();

  // if Q2 (or q2) is set then prefer this value
  if (kinematics.KVSet(kKVQ2) || kinematics.KVSet(kKVq2)) {
    double Q2val = kinematics.Q2();
    return Q2val;
  }
  // if Q2 was not set, then compute it from x,y,Ev,Mnucleon
  if (kinematics.KVSet(kKVy)) {
    const InitialState & init_state = interaction->InitState();
    double Mn = init_state.Tgt().HitNucP4Ptr()->M(); // could be off-shell
    //double x     = this->ScalingVar(interaction);       // could be redefined
    double x     = kinematics.x();
    double y     = kinematics.y();
    double Ev    = init_state.ProbeE(kRfHitNucRest);
    double Q2val = 2*Mn*Ev*x*y;
    return Q2val;
  }
  LOG("DISSF", pERROR) << "Could not compute Q2!";
  return 0;
}

double QPMDISStrucFuncBase::R ( const Interaction *  i ) const

protectedvirtual

Definition at line 475 of file QPMDISStrucFuncBase.cxx.

References fIncludeR, genie::Interaction::Kine(), Q2(), genie::utils::phys::RWhitlow(), and genie::Kinematics::x().

Referenced by Calculate().

{
// Computes R ( ~ longitudinal structure function FL = R * 2xF1)
// The scaling variable can be overwritten to include corrections

//   The x used for computing the DIS Nuclear correction factor should be the
//   experimental x, not the rescaled x or off-shell-rest-frame version of x
//   (i.e. selected x).  Since we do not have access to experimental x at this
//   point in the calculation, just use selected x.
  if(fIncludeR) {
    const Kinematics & kine  = interaction->Kine();
    double x  = kine.x();
//    double x  = this->ScalingVar(interaction);
    double Q2val = this->Q2(interaction);
    double Rval  = utils::phys::RWhitlow(x, Q2val);
    return Rval;
  }
  return 0;
}

double QPMDISStrucFuncBase::ScalingVar ( const Interaction *  i ) const

protectedvirtual

Reimplemented in genie::BYStrucFunc.

Definition at line 426 of file QPMDISStrucFuncBase.cxx.

References genie::Interaction::Kine(), and genie::Kinematics::x().

Referenced by CalcPDFs(), and Calculate().

{
// The scaling variable is set to the normal Bjorken x.
// Override DISStructureFuncModel::ScalingVar() to compute corrections

  return interaction->Kine().x();
}

Member Data Documentation

double genie::QPMDISStrucFuncBase::fc

mutableprotected

Definition at line 104 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fc_c

mutableprotected

Definition at line 110 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

bool genie::QPMDISStrucFuncBase::fCharmOff

protected

turn charm production off?

Definition at line 75 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and LoadConfig().

double genie::QPMDISStrucFuncBase::fds

mutableprotected

Definition at line 102 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fds_c

mutableprotected

Definition at line 108 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fdv

mutableprotected

Definition at line 101 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fdv_c

mutableprotected

Definition at line 107 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fF1

mutableprotected

Definition at line 91 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and F1().

double genie::QPMDISStrucFuncBase::fF2

mutableprotected

Definition at line 92 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and F2().

double genie::QPMDISStrucFuncBase::fF3

mutableprotected

Definition at line 93 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and F3().

double genie::QPMDISStrucFuncBase::fF4

mutableprotected

Definition at line 94 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and F4().

double genie::QPMDISStrucFuncBase::fF5

mutableprotected

Definition at line 95 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and F5().

double genie::QPMDISStrucFuncBase::fF6

mutableprotected

Definition at line 96 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and F6().

bool genie::QPMDISStrucFuncBase::fIncludeNuclMod

protected

include nuclear factor (shadowing, anti-shadowing,...)?

Definition at line 77 of file QPMDISStrucFuncBase.h.

Referenced by LoadConfig(), and NuclMod().

bool genie::QPMDISStrucFuncBase::fIncludeR

protected

include R (~FL) in DIS SF calculation?

Definition at line 76 of file QPMDISStrucFuncBase.h.

Referenced by LoadConfig(), and R().

double genie::QPMDISStrucFuncBase::fLowQ2CutoffF1F2

protected

Set min for relation between 2xF1 and F2.

Definition at line 89 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and LoadConfig().

double genie::QPMDISStrucFuncBase::fMc

protected

charm mass used

Definition at line 78 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and LoadConfig().

PDF* genie::QPMDISStrucFuncBase::fPDF

protected

computed PDFs @ (x,Q2)

Definition at line 97 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), InitPDF(), LoadConfig(), and ~QPMDISStrucFuncBase().

PDF* genie::QPMDISStrucFuncBase::fPDFc

protected

computed PDFs @ (slow-rescaling-var,Q2)

Definition at line 98 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), InitPDF(), LoadConfig(), and ~QPMDISStrucFuncBase().

double genie::QPMDISStrucFuncBase::fQ2min

protected

min Q^2 allowed for PDFs: PDF(Q2<Q2min):=PDF(Q2min)

Definition at line 74 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and LoadConfig().

double genie::QPMDISStrucFuncBase::fs

mutableprotected

Definition at line 103 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fs_c

mutableprotected

Definition at line 109 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fSin2thw

protected

Definition at line 87 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and LoadConfig().

double genie::QPMDISStrucFuncBase::fus

mutableprotected

Definition at line 100 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fus_c

mutableprotected

Definition at line 106 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs().

bool genie::QPMDISStrucFuncBase::fUse2016Corrections

protected

Use 2016 SF relation corrections.

Definition at line 88 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and LoadConfig().

double genie::QPMDISStrucFuncBase::fuv

mutableprotected

Definition at line 99 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs(), and Calculate().

double genie::QPMDISStrucFuncBase::fuv_c

mutableprotected

Definition at line 105 of file QPMDISStrucFuncBase.h.

Referenced by CalcPDFs().

double genie::QPMDISStrucFuncBase::fVcd

protected

CKM element Vcd used.

Definition at line 79 of file QPMDISStrucFuncBase.h.

Referenced by LoadConfig().

double genie::QPMDISStrucFuncBase::fVcd2

protected

Definition at line 83 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and LoadConfig().

double genie::QPMDISStrucFuncBase::fVcs

protected

CKM element Vcs used.

Definition at line 80 of file QPMDISStrucFuncBase.h.

Referenced by LoadConfig().

double genie::QPMDISStrucFuncBase::fVcs2

protected

Definition at line 84 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and LoadConfig().

double genie::QPMDISStrucFuncBase::fVud

protected

CKM element Vud used.

Definition at line 81 of file QPMDISStrucFuncBase.h.

Referenced by LoadConfig().

double genie::QPMDISStrucFuncBase::fVud2

protected

Definition at line 85 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and LoadConfig().

double genie::QPMDISStrucFuncBase::fVus

protected

CKM element Vcs used.

Definition at line 82 of file QPMDISStrucFuncBase.h.

Referenced by LoadConfig().

double genie::QPMDISStrucFuncBase::fVus2

protected

Definition at line 86 of file QPMDISStrucFuncBase.h.

Referenced by Calculate(), and LoadConfig().

---

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

• QPMDISStrucFuncBase.h
• QPMDISStrucFuncBase.cxx