TRT_DriftCircleOnTrackRecalibrateTool.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/

//   Implementation file for class TRT_DriftCircleOnTrackRecalibrateTool
// (c) ATLAS Detector software
// AlgTool used for TRT_DriftCircleOnTrack object production
 
 
#include "TRT_DriftCircleOnTrackTool/TRT_DriftCircleOnTrackRecalibrateTool.h"
#include "InDetRIO_OnTrack/TRT_DriftCircleOnTrack.h"
#include "TrkEventPrimitives/LocalParameters.h"
#include "TRT_ReadoutGeometry/TRT_EndcapElement.h"
#include "TrkRIO_OnTrack/ErrorScalingCast.h"
 

// Constructor
 
InDet::TRT_DriftCircleOnTrackRecalibrateTool::TRT_DriftCircleOnTrackRecalibrateTool
(const std::string& ty,const std::string& na,const IInterface* pa)
  : AthAlgTool(ty,na,pa)
{
  declareInterface<IRIO_OnTrackCreator>(this);
}

// Destructor
 
InDet::TRT_DriftCircleOnTrackRecalibrateTool::~TRT_DriftCircleOnTrackRecalibrateTool()= default;

// Initialisation
 
StatusCode InDet::TRT_DriftCircleOnTrackRecalibrateTool::initialize()
{
  StatusCode sc = AlgTool::initialize();
 
  if(m_drifttool.retrieve().isFailure()){
    msg(MSG::FATAL) << "Failed to retrieve tool " << m_drifttool << endmsg;
    return StatusCode::FAILURE;
  }
 
  if(m_riontrackTube.retrieve().isFailure()){
    msg(MSG::FATAL) << "Failed to retrieve tool " << m_riontrackTube << endmsg;
    return StatusCode::FAILURE;
  }
 
  ATH_CHECK(m_trtErrorScalingKey.initialize(!m_trtErrorScalingKey.key().empty()));
  ATH_CHECK(m_lumiDataKey.initialize ( !m_lumiDataKey.key().empty() && !m_trtErrorScalingKey.key().empty()));
  return sc;
}

// Finalize
 
StatusCode InDet::TRT_DriftCircleOnTrackRecalibrateTool::finalize()
{
   StatusCode sc = AlgTool::finalize(); return sc;
}

// Trk::TRT_DriftCircleOnTrack production
 
Trk::RIO_OnTrack* InDet::TRT_DriftCircleOnTrackRecalibrateTool::correct
(const Trk::PrepRawData& rio,const Trk::TrackParameters& TP,const EventContext& ctx) const
{
  const InDet::TRT_DriftCircle* DC = dynamic_cast<const InDet::TRT_DriftCircle*>(&rio);
  if(!DC) return nullptr;
 
  Trk::RIO_OnTrack *rot=nullptr;
 
  //recalculate driftradius using the new calibration constants
  bool isOK=false;
  double t0=0.;
  double rawtime     = m_drifttool->rawTime(DC->driftTimeBin());
 
  if (m_useToTCorrection) {
        rawtime -= m_drifttool->driftTimeToTCorrection(DC->timeOverThreshold(), DC->identify());
  }
 
  double driftradius = m_drifttool->driftRadius(rawtime,DC->identify(),t0,isOK);
  double error       = m_drifttool->errorOfDriftRadius(rawtime-t0,DC->identify());
 
  double distance=fabs(fabs(TP.parameters()[0])-driftradius);
 
 
  msg(MSG::VERBOSE)<<"Old radius: "<< DC->localPosition()[Trk::driftRadius]<<" -> new radius: "<<driftradius<<endmsg;
 
  if(distance>error*m_scalefactor){
 
    //tube hit
    //
    rot=m_riontrackTube->correct(rio,TP,ctx);
  }
  else {
    // precision hit
    //
    const InDetDD::TRT_BaseElement* pE = DC->detectorElement(); if(!pE) return nullptr;
    IdentifierHash iH = pE->identifyHash();
    const Amg::VectorX& P = TP.parameters();
    double se = sin(P[3]);
    Amg::Vector3D dir(cos(P[2])*se,sin(P[2])*se,cos(P[3]));
 
    double predictedLocZ=P[1];
 
    double sign = (TP.parameters()[0] < 0.) ? -1. : 1.;
 
    // only create objects within the active area
    //
    double sl = pE->strawLength()*.5;
    if     (predictedLocZ > sl) predictedLocZ = sl;
    else if(predictedLocZ <-sl) predictedLocZ =-sl;
 
 
    double escale2=error*error/DC->localCovariance()(Trk::driftRadius,Trk::driftRadius);
    Amg::MatrixX cov(DC->localCovariance()*escale2);
 
    if (!m_trtErrorScalingKey.key().empty()) {
      double mu=0.;
      if (!m_lumiDataKey.empty()) {
          SG::ReadCondHandle<LuminosityCondData> lumiData (m_lumiDataKey,ctx);
          mu = lumiData->lbAverageInteractionsPerCrossing();
      }
 
      bool endcap = false;
      if(dynamic_cast<const InDetDD::TRT_EndcapElement*>(pE)) endcap = true;
      SG::ReadCondHandle<RIO_OnTrackErrorScaling> error_scaling( m_trtErrorScalingKey,ctx);
      cov = Trk::ErrorScalingCast<TRTRIO_OnTrackErrorScaling>(*error_scaling)
                ->getScaledCovariance(std::move(cov), endcap, mu);
    }
 
    Trk::DefinedParameter  radius(sign*driftradius,Trk::locX);
    Trk::LocalParameters lp(radius);
 
    rot=new InDet::TRT_DriftCircleOnTrack(DC,std::move(lp),std::move(cov),iH,predictedLocZ,dir,Trk::DECIDED);
  }
  return rot;
}