LHAPDF6.cxx

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//____________________________________________________________________________
/*
 Copyright (c) 2003-2025, The GENIE Collaboration
 For the full text of the license visit http://copyright.genie-mc.org
 
 Costas Andreopoulos <c.andreopoulos \at cern.ch>
 University of Liverpool
*/
//____________________________________________________________________________
 
#include <cassert>
#include <cstdlib>
 
#include <TSystem.h>
#include <TMath.h>
 
#include "Physics/PartonDistributions/LHAPDF6.h"
#include "Framework/Messenger/Messenger.h"
 
#ifdef __GENIE_LHAPDF6_ENABLED__
#include "LHAPDF/LHAPDF.h"
#endif
 
using namespace genie;
 
//____________________________________________________________________________
LHAPDF6::LHAPDF6() :
PDFModelI("genie::LHAPDF6")
{
  fSetName = "";
  fMemberID = 0;
 
#ifdef __GENIE_LHAPDF6_ENABLED__
  fLHAPDF = 0;
#endif
}
//____________________________________________________________________________
LHAPDF6::LHAPDF6(string config) :
PDFModelI("genie::LHAPDF6", config)
{
  fSetName = "";
  fMemberID = 0;
 
#ifdef __GENIE_LHAPDF6_ENABLED__
  fLHAPDF = 0;
#endif
}
//____________________________________________________________________________
LHAPDF6::~LHAPDF6()
{
//#ifdef __GENIE_LHAPDF6_ENABLED__
//  if(fLHAPDF) delete fLHAPDF;
//#endif
}
//____________________________________________________________________________
double LHAPDF6::UpValence(double x, double Q2) const
{
  return AllPDFs(x,Q2).uval;
}
//____________________________________________________________________________
double LHAPDF6::DownValence(double x, double Q2) const
{
  return AllPDFs(x,Q2).dval;
}
//____________________________________________________________________________
double LHAPDF6::UpSea(double x, double Q2) const
{
  return AllPDFs(x,Q2).usea;
}
//____________________________________________________________________________
double LHAPDF6::DownSea(double x, double Q2) const
{
  return AllPDFs(x,Q2).dsea;
}
//____________________________________________________________________________
double LHAPDF6::Strange(double x, double Q2) const
{
  return AllPDFs(x,Q2).str;
}
//____________________________________________________________________________
double LHAPDF6::Charm(double x, double Q2) const
{
  return AllPDFs(x,Q2).chm;
}
//____________________________________________________________________________
double LHAPDF6::Bottom(double x, double Q2) const
{
  return AllPDFs(x,Q2).bot;
}
//____________________________________________________________________________
double LHAPDF6::Top(double x, double Q2) const
{
  return AllPDFs(x,Q2).top;
}
//____________________________________________________________________________
double LHAPDF6::Gluon(double x, double Q2) const
{
  return AllPDFs(x,Q2).gl;
}
//____________________________________________________________________________
#ifdef __GENIE_LHAPDF6_ENABLED__
PDF_t LHAPDF6::AllPDFs(double x, double Q2) const
{
  PDF_t pdf;
  vector<double> pdfvec;
  fLHAPDF->xfxQ2(x,Q2,pdfvec);
  pdf.uval = pdfvec[8] - pdfvec[4];
  pdf.dval = pdfvec[7] - pdfvec[5];
  pdf.usea = pdfvec[4];
  pdf.dsea = pdfvec[5];
  pdf.str  = pdfvec[9];
  pdf.chm  = pdfvec[10];
  pdf.bot  = pdfvec[11];
  pdf.top  = pdfvec[12];
  pdf.gl   = pdfvec[6];
  return pdf;
}
#else
PDF_t LHAPDF6::AllPDFs(double, double) const
{
  LOG("LHAPDF6",pFATAL) << "LHAPDF6 not enabled.";
  exit(-1);
}
#endif
//____________________________________________________________________________
void LHAPDF6::Configure(const Registry & config)
{
  Algorithm::Configure(config);
  this->LoadConfig();
  fAllowReconfig=false;
}
//____________________________________________________________________________
void LHAPDF6::Configure(string config)
{
  Algorithm::Configure(config);
  this->LoadConfig();
  fAllowReconfig=false;
}
//____________________________________________________________________________
void LHAPDF6::LoadConfig(void)
{
  this->GetParam("SetName",  fSetName );
  this->GetParam("MemberID", fMemberID);
 
#ifdef __GENIE_LHAPDF6_ENABLED__
  fLHAPDF = LHAPDF::mkPDF(fSetName, fMemberID);
  if(!fLHAPDF) {
     LOG("LHAPDF6",pFATAL)
       << "Couldn't retrieve LHADPF6 pdf set: "
       << fSetName << ", member id: " << fMemberID;
     exit(1);
  }
#endif
}
//____________________________________________________________________________