TRTStrawEfficiency.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
// TRTStrawEfficiency.cxx
// author: Ryan D. Reece <ryan.reece@cern.ch>
// created: Nov 2009
 
#ifdef CPU_PROFILER
#include <google/profiler.h>
#endif
 
#include "TRT_TrackHoleSearch/TRTStrawEfficiency.h"
#include "TRT_TrackHoleSearch/TRTTrackHoleSearchTool.h"
 
//#include "TrkParameters/Perigee.h"
#include "TrkParameters/TrackParameters.h"
//#include "TrkParameters/MeasuredTrackParameters.h"
#include "TrkTrack/TrackStateOnSurface.h"
#include "CLHEP/Units/SystemOfUnits.h"
#include "Identifier/Identifier.h"
#include "InDetIdentifier/TRT_ID.h"
#include "InDetRIO_OnTrack/PixelClusterOnTrack.h"
#include "InDetRIO_OnTrack/SCT_ClusterOnTrack.h"
#include "InDetRIO_OnTrack/TRT_DriftCircleOnTrack.h"
#include "GaudiKernel/ITHistSvc.h"
#include "TRT_ConditionsServices/ITRT_StrawNeighbourSvc.h"
#include "EventPrimitives/EventPrimitivesHelpers.h"
#include "StoreGate/ReadHandle.h"
 
#include <cmath> // for fabs
#include <vector>
#include <string>
 
#include "TTree.h"
 
TRTStrawEfficiency::TRTStrawEfficiency(const std::string& name, ISvcLocator* pSvcLocator)
    : AthAlgorithm(name, pSvcLocator),
      m_trt_hole_finder("TRTTrackHoleSearchTool"),
      m_hist_svc("THistSvc", name),
      m_TRTStrawNeighbourSvc("TRT_StrawNeighbourSvc", name),
      m_tree(nullptr),
      m_TRT_ID(nullptr),
      m_num_events(0),
      m_num_tracks(0),
      m_num_preselected_tracks(0),
      m_event_number(0),
      m_run_number(0),
      m_lumi_block(0),
      m_track_pt(0.),
      m_track_eta(0.),
      m_track_phi(0.),
      m_track_d0(0.),
      m_track_z0(0.),
      m_n_pixel_hits(0),
      m_n_sct_hits(0),
      m_n_trt_hits(0),
      m_n_pixel_holes(0),
      m_n_sct_holes(0),
      m_n_trt_holes(0),
      m_n_primary_vertex(0),
      m_n_tube_hits(0)
{
    declareProperty("trt_hole_finder",          m_trt_hole_finder);
    declareProperty("max_abs_d0",               m_max_abs_d0 =          600*CLHEP::mm );
    declareProperty("max_abs_z0",               m_max_abs_z0 =          600*CLHEP::mm );
    declareProperty("min_pT",                   m_min_pT =              1.0*CLHEP::GeV );
    declareProperty("min_p",                    m_min_p =               2.0*CLHEP::GeV ); // added by dan
    declareProperty("max_abs_eta",              m_max_abs_eta =         2.5 );
    declareProperty("min_pixel_hits",           m_min_pixel_hits =      0 );
    declareProperty("min_sct_hits",             m_min_sct_hits =        2 );
    declareProperty("min_trt_hits",             m_min_trt_hits =        15 );
    declareProperty("hist_svc",                 m_hist_svc );
    declareProperty("straw_neighbour_svc",      m_TRTStrawNeighbourSvc );
    declareProperty("tree_name",                m_tree_name =           "trt_eff" );
    declareProperty("stream_name",              m_stream_name =         "TRTEffStream" );
    declareProperty("required_trigger",         m_required_trigger =    "" );
}
 
 
//____________________________________________________________________________
StatusCode TRTStrawEfficiency::initialize() {
 
    // retrieve TRTTrackHoleSearchTool
    ATH_CHECK(m_trt_hole_finder.retrieve());
 
    // retrieve TRT_ID
    ATH_CHECK(detStore()->retrieve(m_TRT_ID, "TRT_ID"));
 
    ATH_CHECK(m_TRTStrawNeighbourSvc.retrieve());
 
    // retrieve the Trk::KalmanUpdator to calculate unbiased track states
    ATH_CHECK(m_updator.retrieve());
 
    // retrieve THistSvc
    ATH_CHECK(m_hist_svc.retrieve());
 
    // retrieve TrigDecisionTool
    if (!m_required_trigger.empty()) {
        ATH_CHECK(m_trigDec.retrieve());
    }
 
    // ntuple
    m_tree = new TTree(m_tree_name.c_str(), m_tree_name.c_str());
    ATH_CHECK(m_hist_svc->regTree(std::string("/") + m_stream_name + std::string("/") + m_tree_name, m_tree));
 
    // Read handles
    ATH_CHECK(m_tracksKey.initialize());
    ATH_CHECK(m_eventInfoKey.initialize());
    ATH_CHECK(m_vertexContainerKey.initialize());
 
    make_branches();
 
#ifdef CPU_PROFILER
    std::string profile_file = "cpu.prof";
    ATH_MSG_ALWAYS( "ProfilerStart(" << profile_file << ")" );
    ProfilerStart(profile_file.c_str());
#endif
 
    return StatusCode::SUCCESS;
}
 
 
//____________________________________________________________________________
StatusCode TRTStrawEfficiency::execute() {
    ATH_MSG_DEBUG( "TRTStrawEfficiency::execute()  event: " << m_num_events );
 
    //    ATH_MSG_DEUBG( "getListOfTriggers: " << m_trigDec->getListOfTriggers() );
 
    // require trigger
    if ( !m_required_trigger.empty() ) {
        if ( !m_trigDec->isPassed(m_required_trigger) ) {
            // skip event
            ATH_MSG_DEBUG( "  trigger: " << m_required_trigger << " failed.  Skipping event.");
            return StatusCode::SUCCESS;
        } else {
            ATH_MSG_DEBUG( "  trigger: " << m_required_trigger << " passed.");
        }
    }
 
    // retrive tracks
    SG::ReadHandle<TrackCollection> tracks(m_tracksKey);
    if (!tracks.isValid()) {
        ATH_MSG_FATAL( "Failed to retrieve " << m_tracksKey.key() );
        return StatusCode::FAILURE;
    }
 
    // retrieve event info
    SG::ReadHandle<xAOD::EventInfo> event_info(m_eventInfoKey);
    if (!event_info.isValid()) {
        ATH_MSG_FATAL( "Failed to retrieve " << m_eventInfoKey.key() );
        return StatusCode::FAILURE;
    }
 
    m_event_number = event_info->eventNumber();
    m_run_number = event_info->runNumber();
    m_lumi_block = event_info->lumiBlock();
 
    ATH_MSG_DEBUG( "run_number = " << m_run_number << ", lumi_block = " << m_lumi_block << ", event_number = " << m_event_number );
 
    // loop over tracks
    ATH_MSG_DEBUG( "This event has " << tracks->size() << " tracks." );
    for (const auto *track : *tracks) {
        m_num_tracks++;
 
        // clear branches
        clear_branches();
 
        // get perigee
        const Trk::Perigee* perigee = track->perigeeParameters();
        if (perigee) {
            m_track_pt = perigee->pT();
            m_track_eta = perigee->eta();
            m_track_phi = perigee->parameters()[Trk::phi0];
            m_track_d0 = perigee->parameters()[Trk::d0];
            m_track_z0 = perigee->parameters()[Trk::z0];
            ATH_MSG_DEBUG( "  This track has perigee parameters:\n"
                           << "                 pT     = " << m_track_pt/CLHEP::GeV << " CLHEP::GeV" << "\n"
                           << "                 eta =    " << m_track_eta << "\n"
                           << "                 phi0 =   " << m_track_phi << "\n"
                           << "                 d0 =     " << m_track_d0 << "\n"
                           << "                 z0 =     " << m_track_z0 << "\n"
                           << "                 theta =  " << perigee->parameters()[Trk::theta] << "\n"
                           << "                 qOverP = " << perigee->parameters()[Trk::qOverP] );
        } else {
            ATH_MSG_ERROR( "  This track has null perigeeParameters." );
            continue;
        }
 
        // get TrackStateOnSurfaces
        const Trk::TrackStates* track_states = track->trackStateOnSurfaces();
        if (track_states) {
            ATH_MSG_DEBUG( "  This track has " << track_states->size() << " track states on surface." );
        } else {
            ATH_MSG_ERROR( "  This track has null track states on surface." );
            continue;
        }
 
        // count hits
        for (const auto *trackState : *track_states) {
            if (trackState->type(Trk::TrackStateOnSurface::Measurement)) {
                if (dynamic_cast<const InDet::TRT_DriftCircleOnTrack*> (trackState->measurementOnTrack())) m_n_trt_hits++;
                else if (dynamic_cast<const InDet::SCT_ClusterOnTrack*> (trackState->measurementOnTrack())) m_n_sct_hits++;
                else if (dynamic_cast<const InDet::PixelClusterOnTrack*> (trackState->measurementOnTrack())) m_n_pixel_hits++;
            }
        }
 
        ATH_MSG_DEBUG( "  This track has\n"
                       << "        # Pixel hits = " << m_n_pixel_hits << "\n"
                       << "        # SCT hits =   " << m_n_sct_hits << "\n"
                       << "        # TRT hits =   " << m_n_trt_hits );
 
        // preselect tracks
        bool passed_track_preselection =
            ( fabs(perigee->parameters()[Trk::d0]) < m_max_abs_d0 )&&
            ( fabs(perigee->parameters()[Trk::z0]) < m_max_abs_z0 )&&
            ( 1/fabs(perigee->parameters()[Trk::qOverP]) > m_min_p )&& // added by dan
            ( perigee->pT() > m_min_pT )&&
            ( fabs(perigee->eta()) < m_max_abs_eta )&&
            ( m_n_pixel_hits >= m_min_pixel_hits)&&
            ( m_n_sct_hits >= m_min_sct_hits)&&
            ( m_n_trt_hits >= m_min_trt_hits);
 
        if (!passed_track_preselection) {
            ATH_MSG_DEBUG( "  This track failed preselection." );
            continue;
        }
 
        ATH_MSG_DEBUG( "  This track passed preselection." );
        m_num_preselected_tracks++;
 
        for (const auto *trackState : *track_states ) {
            if (trackState->type(Trk::TrackStateOnSurface::Measurement)) {
                fill_hit_data(*trackState);
            }
        }
 
        const Trk::TrackStates* holes = m_trt_hole_finder->getHolesOnTrack(*track);
        if (!holes) {
            ATH_MSG_WARNING( "  TRTTrackHoleSearchTool returned null results." );
            continue;
        } else {
            m_n_pixel_holes = 0;
            m_n_sct_holes = 0;
            m_n_trt_holes = 0;
            for (const auto *hole : *holes) {
                if (hole->type(Trk::TrackStateOnSurface::Hole)) {
                    int hole_det = fill_hole_data(*hole);
                    switch (hole_det) {
                    case 1:
                        m_n_pixel_holes++;
                        break;
                    case 2:
                        m_n_sct_holes++;
                        break;
                    case 3:
                        m_n_trt_holes++;
                        break;
                    default:
                        ATH_MSG_ERROR("fill_hole_data returned an invalid det type: " << hole_det);
                    }
                } else {
                    ATH_MSG_WARNING("  hole finder returned a TrackStateOnSurface not of type Hole.");
                }
            }
            delete holes;
        }
 
        //------- added by dan -------
 
        SG::ReadHandle<xAOD::VertexContainer> vxContainer(m_vertexContainerKey);
 
        if (!vxContainer.isValid()) {
            ATH_MSG_ERROR("  Failed to retrieve VxContainer: " << m_vertexContainerKey.key());
            return StatusCode::FAILURE;
        }
        m_n_primary_vertex = vxContainer->size() - 1;
        //-----------------------------
 
 
        m_tree->Fill();
 
        ATH_MSG_DEBUG( "  This track has\n"
                       << "        # Pixel holes = " << m_n_pixel_holes << "\n"
                       << "        # SCT holes =   " << m_n_sct_holes << "\n"
                       << "        # TRT holes =   " << m_n_trt_holes );
 
    } // end loop over tracks
 
    m_num_events++;
    return StatusCode::SUCCESS;
}
 
 
//____________________________________________________________________________
StatusCode TRTStrawEfficiency::finalize() {
    ATH_MSG_DEBUG( "# tracks = " << m_num_tracks );
    ATH_MSG_DEBUG( "# preselected tracks = " << m_num_preselected_tracks );
 
#ifdef ANP_CPU_PROFILER
    ATH_MSG_ALWAYS("ProfilerStop.");
    ProfilerStop();
#endif
 
    return StatusCode::SUCCESS;
}
 
 
//----------------------------------------------------------------------------
// private methods
//----------------------------------------------------------------------------
 
//____________________________________________________________________________
void TRTStrawEfficiency::make_branches() {
    m_tree->Branch("event_number", &m_event_number, "event_number/i");
    m_tree->Branch("run_number", &m_run_number, "run_number/i");
    m_tree->Branch("lumi_block", &m_lumi_block, "lumi_block/i");
    m_tree->Branch("track_pt", &m_track_pt, "track_pt/F");
    m_tree->Branch("track_eta", &m_track_eta, "track_eta/F");
    m_tree->Branch("track_phi", &m_track_phi, "track_phi/F");
    m_tree->Branch("track_d0", &m_track_d0, "track_d0/F");
    m_tree->Branch("track_z0", &m_track_z0, "track_z0/F");
    m_tree->Branch("n_pixel_hits", &m_n_pixel_hits, "n_pixel_hits/I");
    m_tree->Branch("n_sct_hits", &m_n_sct_hits, "n_sct_hits/I");
    m_tree->Branch("n_trt_hits", &m_n_trt_hits, "n_trt_hits/I");
    m_tree->Branch("hit_bec", &m_hit_bec);
    m_tree->Branch("hit_phi", &m_hit_phi);
    m_tree->Branch("hit_layer", &m_hit_layer);
    m_tree->Branch("hit_strawlayer", &m_hit_strawlayer);
    m_tree->Branch("hit_straw", &m_hit_straw);
    m_tree->Branch("hit_chip", &m_hit_chip);
    m_tree->Branch("hit_pad", &m_hit_pad);
    m_tree->Branch("hit_x", &m_hit_x);
    m_tree->Branch("hit_y", &m_hit_y);
    m_tree->Branch("hit_z", &m_hit_z);
    m_tree->Branch("hit_center_x", &m_hit_center_x);
    m_tree->Branch("hit_center_y", &m_hit_center_y);
    m_tree->Branch("hit_center_z", &m_hit_center_z);
    m_tree->Branch("hit_R", &m_hit_R);
    m_tree->Branch("hit_locR", &m_hit_locR);
    m_tree->Branch("hit_HL", &m_hit_HL);
    m_tree->Branch("hit_det", &m_hit_det);
    m_tree->Branch("hit_ub_locR", &m_hit_ub_locR);
    m_tree->Branch("hit_ub_x", &m_hit_ub_x);
    m_tree->Branch("hit_ub_y", &m_hit_ub_y);
    m_tree->Branch("hit_ub_z", &m_hit_ub_z);
    m_tree->Branch("n_pixel_holes", &m_n_pixel_holes, "n_pixel_holes/I");
    m_tree->Branch("n_sct_holes", &m_n_sct_holes, "n_sct_holes/I");
    m_tree->Branch("n_trt_holes", &m_n_trt_holes, "n_trt_holes/I");
    m_tree->Branch("hole_bec", &m_hole_bec);
    m_tree->Branch("hole_phi", &m_hole_phi);
    m_tree->Branch("hole_layer", &m_hole_layer);
    m_tree->Branch("hole_strawlayer", &m_hole_strawlayer);
    m_tree->Branch("hole_straw", &m_hole_straw);
    m_tree->Branch("hole_chip", &m_hole_chip);
    m_tree->Branch("hole_pad", &m_hole_pad);
    m_tree->Branch("hole_x", &m_hole_x);
    m_tree->Branch("hole_y", &m_hole_y);
    m_tree->Branch("hole_z", &m_hole_z);
    m_tree->Branch("hole_center_x", &m_hole_center_x);
    m_tree->Branch("hole_center_y", &m_hole_center_y);
    m_tree->Branch("hole_center_z", &m_hole_center_z);
    m_tree->Branch("hole_locR", &m_hole_locR);
    m_tree->Branch("hole_locR_error", &m_hole_locR_error);
    m_tree->Branch("hole_det", &m_hole_det);
 
    // ---- branches added by dan ------
    m_tree->Branch("n_primary_vertex", &m_n_primary_vertex, "n_primary_vertex/I");
    m_tree->Branch("hit_tube_hit", &m_hit_tube_hit);
    m_tree->Branch("n_tube_hits", &m_n_tube_hits, "n_tube_hits/I");
    // -------------------------------
}
 
 
//____________________________________________________________________________
void TRTStrawEfficiency::clear_branches() {
    m_event_number = 0;
    m_run_number = 0;
    m_lumi_block = 0;
    m_track_pt = 0.0;
    m_track_eta = 0.0;
    m_track_phi = 0.0;
    m_track_d0 = 0.0;
    m_track_z0 = 0.0;
    m_n_pixel_hits = 0;
    m_n_sct_hits = 0;
    m_n_trt_hits = 0;
    m_hit_bec.clear();
    m_hit_phi.clear();
    m_hit_layer.clear();
    m_hit_strawlayer.clear();
    m_hit_straw.clear();
    m_hit_chip.clear();
    m_hit_pad.clear();
    m_hit_x.clear();
    m_hit_y.clear();
    m_hit_z.clear();
    m_hit_center_x.clear();
    m_hit_center_y.clear();
    m_hit_center_z.clear();
    m_hit_R.clear();
    m_hit_locR.clear();
    m_hit_HL.clear();
    m_hit_det.clear();
    m_hit_ub_locR.clear();
    m_hit_ub_x.clear();
    m_hit_ub_y.clear();
    m_hit_ub_z.clear();
    m_n_pixel_holes = 0;
    m_n_sct_holes = 0;
    m_n_trt_holes = 0;
    m_hole_bec.clear();
    m_hole_phi.clear();
    m_hole_layer.clear();
    m_hole_strawlayer.clear();
    m_hole_straw.clear();
    m_hole_chip.clear();
    m_hole_pad.clear();
    m_hole_x.clear();
    m_hole_y.clear();
    m_hole_z.clear();
    m_hole_center_x.clear();
    m_hole_center_y.clear();
    m_hole_center_z.clear();
    m_hole_locR.clear();
    m_hole_locR_error.clear();
    m_hole_det.clear();
 
    m_n_primary_vertex = 0;  // added by dan
    m_hit_tube_hit.clear();  // added by dan
    m_n_tube_hits = 0;       // added by dan
}
 
 
//____________________________________________________________________________
int TRTStrawEfficiency::fill_hit_data(const Trk::TrackStateOnSurface& hit) {
    const Trk::TrackParameters* track_parameters = hit.trackParameters();
    if (!track_parameters) {
        ATH_MSG_ERROR("fill_hit_data(hit): null track_parameters");
        return 0;
    }
 
    m_hit_x.push_back( track_parameters->position().x() );
    m_hit_y.push_back( track_parameters->position().y() );
    m_hit_z.push_back( track_parameters->position().z() );
 
    m_hit_center_x.push_back( track_parameters->associatedSurface().center().x() );
    m_hit_center_y.push_back( track_parameters->associatedSurface().center().y() );
    m_hit_center_z.push_back( track_parameters->associatedSurface().center().z() );
 
    Identifier id = track_parameters->associatedSurface().associatedDetectorElementIdentifier();
 
    int det = 0;
    if(m_TRT_ID->is_pixel(id)) {
        det = 1;
    }   else if(m_TRT_ID->is_sct(id)) {
        det = 2;
    }   else if(m_TRT_ID->is_trt(id)) {
        det = 3;
    }
    m_hit_det.push_back( det );
 
    m_hit_bec.push_back( det == 3 ?         m_TRT_ID->barrel_ec(id) : 0 );
    m_hit_phi.push_back( det == 3 ?         m_TRT_ID->phi_module(id) : -1 );
    m_hit_layer.push_back( det == 3 ?       m_TRT_ID->layer_or_wheel(id) : -1 );
    m_hit_strawlayer.push_back( det == 3 ?  m_TRT_ID->straw_layer(id) : -1 );
    m_hit_straw.push_back( det == 3 ?       m_TRT_ID->straw(id) : -1 );
 
    int chip = -1;
    if(det == 3) {
        m_TRTStrawNeighbourSvc->getChip(id, chip);
    }
    m_hit_chip.push_back(chip);
 
    int pad = -1;
    if(det == 3) {
        m_TRTStrawNeighbourSvc->getPad(id, pad);
    }
    m_hit_pad.push_back(pad);
 
    m_hit_locR.push_back( det == 3 ? track_parameters->parameters()[Trk::locR] : -1 );
 
    const Trk::MeasurementBase* measurement = hit.measurementOnTrack();
    const InDet::TRT_DriftCircleOnTrack* trtcircle = nullptr;
    if(measurement) {
        trtcircle = dynamic_cast<const InDet::TRT_DriftCircleOnTrack*> (measurement);
    }   else {
        ATH_MSG_ERROR("fill_hit_data(hit): null measurement");
    }
 
    if(!trtcircle) {
        ATH_MSG_DEBUG("fill_hit_data(hit): null trtcircle");
    }
 
    m_hit_R.push_back( (det == 3)&&(trtcircle != nullptr) ? trtcircle->localParameters()[Trk::driftRadius] : -1 );
    m_hit_HL.push_back( (det == 3)&&(trtcircle != nullptr) ? trtcircle->highLevel() : -1 );
 
    // unbiased trk parameters
  std::unique_ptr<Trk::TrackParameters> unbiased_track_parameters =
    m_updator->removeFromState(
      *(hit.trackParameters()),
      hit.measurementOnTrack()->localParameters(),
      hit.measurementOnTrack()->localCovariance());
 
  m_hit_ub_locR.push_back( det == 3 && unbiased_track_parameters ? unbiased_track_parameters->parameters()[Trk::locR] : -1 );
    m_hit_ub_x.push_back( unbiased_track_parameters ? unbiased_track_parameters->position().x() : -1 );
    m_hit_ub_y.push_back( unbiased_track_parameters ? unbiased_track_parameters->position().y() : -1 );
    m_hit_ub_z.push_back( unbiased_track_parameters ? unbiased_track_parameters->position().z() : -1 );
 
    // ------- added by dan -------
    int is_tube_hit = -1;
    if (measurement && (det == 3) ) {
        is_tube_hit = ((measurement->localCovariance())(Trk::locX,Trk::locX) > 1.0)? 1 : 0;
        if (is_tube_hit) m_n_tube_hits++;
    }
 
    m_hit_tube_hit.push_back( (det == 3)&&(measurement != nullptr) ? is_tube_hit : -1);
 
    // ----------------------------
 
 
    return det;
}
 
 
//____________________________________________________________________________
int TRTStrawEfficiency::fill_hole_data(const Trk::TrackStateOnSurface& hole) {
    const Trk::TrackParameters* track_parameters = hole.trackParameters();
    if (!track_parameters) {
        ATH_MSG_ERROR("fill_hole_data(hole): null track_parameters");
        return 0;
    }
 
    m_hole_x.push_back( track_parameters->position().x() );
    m_hole_y.push_back( track_parameters->position().y() );
    m_hole_z.push_back( track_parameters->position().z() );
 
    m_hole_center_x.push_back( track_parameters->associatedSurface().center().x() );
    m_hole_center_y.push_back( track_parameters->associatedSurface().center().y() );
    m_hole_center_z.push_back( track_parameters->associatedSurface().center().z() );
 
    Identifier id = track_parameters->associatedSurface().associatedDetectorElementIdentifier();
 
    int det = 0;
    if(m_TRT_ID->is_pixel(id)) {
        det = 1;
    }   else if(m_TRT_ID->is_sct(id)) {
        det = 2;
    }   else if(m_TRT_ID->is_trt(id)) {
        det = 3;
    }
    m_hole_det.push_back( det );
 
    m_hole_bec.push_back( det == 3 ? m_TRT_ID->barrel_ec(id) : -1 );
    m_hole_phi.push_back( det == 3 ? m_TRT_ID->phi_module(id) : -1 );
    m_hole_layer.push_back( det == 3 ? m_TRT_ID->layer_or_wheel(id) : -1 );
    m_hole_strawlayer.push_back( det == 3 ? m_TRT_ID->straw_layer(id) : -1 );
    m_hole_straw.push_back( det == 3 ? m_TRT_ID->straw(id) : -1 );
 
    int chip = -1;
    if (det == 3) {
        m_TRTStrawNeighbourSvc->getChip(id, chip);
    }
    m_hole_chip.push_back(chip);
 
    int pad = -1;
    if (det == 3) {
        m_TRTStrawNeighbourSvc->getPad(id, pad);
    }
    m_hole_pad.push_back(pad);
 
    float locR = track_parameters->parameters()[Trk::locR];
    m_hole_locR.push_back( det == 3 ? locR : -1 );
 
    float locR_error = 0.0;
    //const Trk::MeasuredTrackParameters* meas = dynamic_cast< const Trk::MeasuredTrackParameters* >(track_parameters);
    //if(meas)
    //{
 
    const AmgSymMatrix(5)* merr = track_parameters->covariance();
    if(merr){
        locR_error = Amg::error(*merr,Trk::locR);
    }   else {
        ATH_MSG_ERROR("Track parameters have no covariance attached.");
    }
    m_hole_locR_error.push_back( det == 3 ? locR_error : 0.0 );
 
    /*
      ATH_MSG_DEBUG("hole trk x = " << track_parameters->position().x() <<
      ", surf x = " << track_parameters->associatedSurface()->center().x());
      ATH_MSG_DEBUG("hole trk y = " << track_parameters->position().y() <<
      ", surf y = " << track_parameters->associatedSurface()->center().y());
      ATH_MSG_DEBUG("hole trk z = " << track_parameters->position().z() <<
      ", surf z = " << track_parameters->associatedSurface()->center().z());
    */
 
    return det;
}