PDFWeight.h

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// Author: Danilo Ferreira de Lima <dferreir@cern.ch>
 
#ifndef PDFWEIGHT_H
#define PDFWEIGHT_H
 
// Include the base class
#include "ReweightUtils/WeightToolBase.h"
 
namespace LHAPDF {
class PDF;
}
 
class PDFWeight : public WeightToolBase
  {
    ASG_TOOL_CLASS2( PDFWeight, IWeightTool, IObservableTool )
 
   public:
    PDFWeight( const std::string& name );

    virtual ~PDFWeight() {};
 
    StatusCode initialize() override;

    virtual double evaluate( const xAOD::IParticle* part ) const override;

    virtual double getWeight() const override;
 
 
   private:
    //internal function "computing" the weight
    double computeWeight(const xAOD::EventInfo*) const;
 
    std::string m_pdfName;
    std::string m_truthEventContainerName;
    std::string m_eventInfoName;
    float m_weight;
 
    LHAPDF::PDF* m_pdf = 0;
 
    int m_index;
};
 
#endif //> !PDFWEIGHT_H