egammaConversion0FillerTool.cxx

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id$
#include "egammaConversion0FillerTool.h"
#include "xAODTracking/Vertex.h"
#include "AthenaKernel/errorcheck.h"
 
 
namespace D3PD {
 
 
egammaConversion0FillerTool::egammaConversion0FillerTool
    (const std::string& type,
     const std::string& name,
     const IInterface* parent)
      : BlockFillerTool<xAOD::Photon> (type, name, parent)
{
  book().ignore(); // Avoid coverity warnings.
}
 
 
StatusCode egammaConversion0FillerTool::book()
{
  CHECK( addVariable ("convFlag",       m_convFlag,
                      "Number of tracks for the first conversion candidate; "
                      "0 if no conversion or if there are more than "
                      "two tracks.") );
  CHECK( addVariable ("isConv",         m_isConv,
                      "True if the first conversion candidate has "
                      "1 or 2 tracks.") );
  CHECK( addVariable ("nConv",          m_nConv,
                      "Number of conversion vertices.") );
  CHECK( addVariable ("nSingleTrackConv",    m_nSingleTrackConv,
                   "Number of conversion vertices with exactly one track.") );
  CHECK( addVariable ("nDoubleTrackConv",    m_nDoubleTrackConv,
                   "Number of conversion vertices with exactly two tracks.") );
 
  return StatusCode::SUCCESS;
}
 
 
StatusCode egammaConversion0FillerTool::fill (const xAOD::Photon& p)
{
  const xAOD::Vertex* conv = p.vertex();
 
  if (conv && conv->nTrackParticles()<=2)
    *m_convFlag = conv->nTrackParticles();
  else
    *m_convFlag = 0;
 
  *m_isConv = (*m_convFlag > 0);
 
  *m_nConv = p.nVertices();
  for (int i = 0; i < *m_nConv; i++) {
    const xAOD::Vertex* conv = p.vertex(i);
    if (conv) {
      int ntr = conv->nTrackParticles();
      if (ntr == 1)
        ++*m_nSingleTrackConv;
      else if (ntr == 2)
        ++*m_nDoubleTrackConv;
    }
  }
 
  return StatusCode::SUCCESS;
}
 
 
} // namespace D3PD