BeamSpotReweightingAlg.h

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// Dear emacs, this is -*- C++ -*-
 
/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef BEAMEFFECTS_BeamSpotReweightingAlg_H
#define BEAMEFFECTS_BeamSpotReweightingAlg_H
 
// base class header
#include "AthenaBaseComps/AthReentrantAlgorithm.h"
 
// Athena includes
#include "StoreGate/ReadHandleKey.h"
#include "StoreGate/WriteHandleKey.h"
#include "StoreGate/WriteDecorHandleKey.h"
#include "xAODEventInfo/EventInfo.h"
#include "BeamSpotConditionsData/BeamSpotData.h"
#include "GeneratorObjects/McEventCollection.h"
 
// Gaudi includes
#include "GaudiKernel/ToolHandle.h"
#include "GaudiKernel/PhysicalConstants.h"
 
// Forward declarations
#include "AtlasHepMC/GenEvent_fwd.h"
#include "AtlasHepMC/GenVertex_fwd.h"
 
namespace Simulation
{

  class BeamSpotReweightingAlg : public AthReentrantAlgorithm
  {
  public:
 
    //** Constructor with parameters */
    BeamSpotReweightingAlg( const std::string& name, ISvcLocator* pSvcLocator );

    virtual ~BeamSpotReweightingAlg() = default;

    virtual StatusCode initialize() override final;

    virtual StatusCode execute(const EventContext& ctx) const override final;
 
  private:

    HepMC::ConstGenVertexPtr GetSignalProcessVertex(const HepMC::GenEvent& ge) const;
 
    SG::ReadHandleKey<McEventCollection> m_inputMcEventCollection { this, "InputMcEventCollection", "TruthEvent", "The name of the input McEventCollection" };
 
    SG::ReadHandleKey<xAOD::EventInfo> m_eventInfo { this, "EventInfo", "EventInfo", "EventInfo object in SG" };
 
    SG::WriteDecorHandleKey<xAOD::EventInfo> m_beamSpotWeight {this, "beamSpotWeight", m_eventInfo, "beamSpotWeight", "Decoration for a beam spot weight when reweighting the beam spot size" };
 
    SG::ReadCondHandleKey<InDet::BeamSpotData> m_beamSpotKey { this, "BeamSpotKey", "BeamSpotData", "SG key for beam spot" };
 
    Gaudi::Property<float> m_input_beam_sigma_z{this, "Input_beam_sigma_z", 42*Gaudi::Units::mm, "Beam spot sigma of the input HIT file to be reweighted"};
  };
 
}
 
#endif // BEAMEFFECTS_BeamSpotReweightingAlg_H