AsgPtEtaSelectionTool.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
 
 
 
//
// includes
//
 
#include <AsgAnalysisAlgorithms/AsgPtEtaSelectionTool.h>
 
#include <xAODEgamma/Egamma.h>
#include <xAODBase/IParticle.h>
#include <cmath>
 
//
// method implementations
//
 
namespace CP
{
 
  StatusCode AsgPtEtaSelectionTool ::
  initialize ()
  {
    if (m_useDressedProperties && m_useClusterEta)
    {
      ATH_MSG_ERROR ("both 'useClusterEta' and 'useDressedProperties' can not be used at the same time");
      return StatusCode::FAILURE;
    }
    if (m_minPt < 0 || !std::isfinite (m_minPt))
    {
      ATH_MSG_ERROR ("invalid value of minPt: " << m_minPt);
      return StatusCode::FAILURE;
    }
    if (m_maxPt < 0 || !std::isfinite (m_maxPt))
    {
      ATH_MSG_ERROR ("invalid value of m_maxPt: " << m_maxPt);
      return StatusCode::FAILURE;
    }
    if (m_maxEta < 0 || !std::isfinite (m_maxEta))
    {
      ATH_MSG_ERROR ("invalid value of maxEta: " << m_maxEta);
      return StatusCode::FAILURE;
    }
    if (m_etaGapLow < 0 || !std::isfinite (m_etaGapLow))
    {
      ATH_MSG_ERROR ("invalid value of etaGapLow: " << m_etaGapLow);
      return StatusCode::FAILURE;
    }
    if (m_etaGapHigh < 0 || !std::isfinite (m_etaGapHigh))
    {
      ATH_MSG_ERROR ("invalid value of etaGapHigh: " << m_etaGapHigh);
      return StatusCode::FAILURE;
    }
    if (m_etaGapHigh > 0 && m_etaGapLow >= m_etaGapHigh)
    {
      ATH_MSG_ERROR ("invalid eta gap: " << m_etaGapLow << " to " << m_etaGapHigh);
      return StatusCode::FAILURE;
    }
    if (m_etaGapHigh > 0 && m_maxEta > 0 && m_etaGapHigh >= m_maxEta)
    {
      ATH_MSG_ERROR ("etaGapHigh=" << m_etaGapHigh << " >= maxEta=" << m_maxEta);
      return StatusCode::FAILURE;
    }
 
    if (m_useDressedProperties) {
       ATH_MSG_DEBUG( "Performing pt and eta cuts on the dressed properties" );
       m_dressedPropertiesIndex = m_accept.addCut ("dressedProperties", "has dressed properties");
       m_dressedPtAccessor = std::make_unique<SG::AuxElement::ConstAccessor<float>> ("pt_dressed");
       m_dressedEtaAccessor = std::make_unique<SG::AuxElement::ConstAccessor<float>> ("eta_dressed");
    }
    if (m_minPt > 0) {
       ATH_MSG_DEBUG( "Performing pt >= " << m_minPt << " MeV selection" );
       m_minPtCutIndex = m_accept.addCut ("minPt", "minimum pt cut");
    }
    if (m_maxPt > 0) {
       ATH_MSG_DEBUG( "Performing pt < " << m_maxPt << " MeV selection" );
       m_maxPtCutIndex = m_accept.addCut ("maxPt", "maximum pt cut");
    }
    if (m_useClusterEta) {
       ATH_MSG_DEBUG( "Performing eta cut on the e/gamma cluster" );
       m_egammaCastCutIndex = m_accept.addCut ("castEgamma", "cast to egamma");
       m_egammaClusterCutIndex = m_accept.addCut ("caloCluster", "egamma object has cluster");
    }
    if (m_maxEta > 0) {
       ATH_MSG_DEBUG( "Performing |eta| < " << m_maxEta << " selection" );
       m_maxEtaCutIndex = m_accept.addCut ("maxEta", "maximum eta cut");
    }
    if (m_etaGapHigh > 0) {
       ATH_MSG_DEBUG( "Performing !( " << m_etaGapLow << " < |eta| < "
                      << m_etaGapHigh << " ) selection" );
       m_etaGapCutIndex = m_accept.addCut ("etaGap", "eta gap cut");
    }
    m_shouldPrintCastWarning = m_printCastWarning;
    m_shouldPrintClusterWarning = m_printClusterWarning;
 
    return StatusCode::SUCCESS;
  }
 
 
 
  const asg::AcceptInfo& AsgPtEtaSelectionTool ::
  getAcceptInfo () const
  {
    return m_accept;
  }
 
 
 
  asg::AcceptData AsgPtEtaSelectionTool ::
  accept (const xAOD::IParticle *particle) const
  {
    asg::AcceptData accept (&m_accept);
 
    // Check if dressed properties exist if needed
    if (m_useDressedProperties) {
       if (!m_dressedPtAccessor->isAvailable(*particle)) {
         ANA_MSG_WARNING ("dressed decorations not available");
         return accept;
       }
       accept.setCutResult (m_dressedPropertiesIndex, true);
    }
 
    // Perform the tranverse momentum cuts.
    if (m_minPtCutIndex >= 0 || m_maxPtCutIndex >= 0)
    {
      float pt = particle->pt();
      if (m_useDressedProperties) {
        pt = (*m_dressedPtAccessor) (*particle);
      }
 
      if (m_minPtCutIndex >= 0) {
        if (!std::isfinite(pt) || pt < 0.)
        {
          ANA_MSG_WARNING ("invalid pt value, setting object to fail pt-cut: " << pt);
          accept.setCutResult (m_minPtCutIndex, false);
        } else
        {
          accept.setCutResult (m_minPtCutIndex, pt >= m_minPt);
        }
      }
      if (m_maxPtCutIndex >= 0) {
        accept.setCutResult (m_maxPtCutIndex, pt < m_maxPt);
      }
    }
 
    // Perform the eta cut(s).
    if (m_maxEtaCutIndex >= 0 || m_etaGapCutIndex >= 0)
    {
      float absEta = 0;
 
      if (m_useClusterEta == true)
      {
        const xAOD::Egamma *egamma
          = dynamic_cast<const xAOD::Egamma*>(particle);
        if (egamma == nullptr)
        {
          if (m_shouldPrintCastWarning)
            ANA_MSG_ERROR ("failed to cast input particle to electron");
          m_shouldPrintCastWarning = false;
          return accept;
        }
        accept.setCutResult (m_egammaCastCutIndex, true);
        const xAOD::CaloCluster *const caloCluster {egamma->caloCluster()};
        if (!caloCluster)
        {
          if (m_shouldPrintClusterWarning)
            ANA_MSG_ERROR ("no calo-cluster associated with e-gamma object");
          m_shouldPrintClusterWarning = false;
          return accept;
        }
        accept.setCutResult (m_egammaClusterCutIndex, true);
        absEta = std::abs (caloCluster->etaBE(2));
      } else if (m_useDressedProperties)
      {
        absEta = std::abs ((*m_dressedEtaAccessor) (*particle));
      } else
      {
        absEta = std::abs (particle->eta());
      }
 
      if (m_maxEtaCutIndex >= 0) {
        accept.setCutResult (m_maxEtaCutIndex, absEta <= m_maxEta);
      }
      if (m_etaGapCutIndex >= 0) {
        accept.setCutResult (m_etaGapCutIndex, (absEta < m_etaGapLow ||
                                                  absEta > m_etaGapHigh));
      }
    }
 
    return accept;
  }
}