InDetAmbiTrackSelectionTool.cxx

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/*
  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
*/
 
// InDetAmbiTrackSelectionTool.cxx, (c) ATLAS Detector software
// Markus Elsing
 
#include "InDetAmbiTrackSelectionTool/InDetAmbiTrackSelectionTool.h"
 
#include "AthContainers/DataVector.h"
#include "InDetIdentifier/SiliconID.h"
#include "InDetPrepRawData/PixelCluster.h"
#include "TrkDetElementBase/TrkDetElementBase.h"
#include "TrkMeasurementBase/MeasurementBase.h"
#include "TrkPrepRawData/PrepRawData.h"
#include "TrkPseudoMeasurementOnTrack/PseudoMeasurementOnTrack.h"
#include "TrkRIO_OnTrack/RIO_OnTrack.h"
#include "TrkSurfaces/Surface.h"
#include "TrkTrack/Track.h"
#include "TrkTrack/TrackInfo.h"
#include "TrkTrackSummary/TrackSummary.h"
#include "TrkEventUtils/PRDtoTrackMap.h"
#include "TrkEventUtils/ClusterSplitProbabilityContainer.h"
 
//================ Constructor =================================================
 
InDet::InDetAmbiTrackSelectionTool::InDetAmbiTrackSelectionTool(const std::string& t,
                                                                const std::string& n,
                                                                const IInterface*  p) :
  base_class(t, n, p)
{
  // compute the number of shared hits from the number of max shared modules
  m_maxShared = 2*m_maxSharedModules+1;
}
 
//================ Initialisation =================================================
 
StatusCode InDet::InDetAmbiTrackSelectionTool::initialize()
{
  // Get segment selector tool
  //
  ATH_CHECK(m_selectortool.retrieve(DisableTool{!m_parameterization}));
  ATH_CHECK(detStore()->retrieve(m_detID, "SiliconID" ));
  ATH_MSG_DEBUG( "initialize() successful" );
 
  ATH_CHECK(m_assoTool.retrieve() );
  return StatusCode::SUCCESS;
}
 
//================ Finalisation =================================================
 
StatusCode InDet::InDetAmbiTrackSelectionTool::finalize()
{
  return StatusCode::SUCCESS;
}
 
//============================================================================================
std::tuple<Trk::Track*,bool> InDet::InDetAmbiTrackSelectionTool::getCleanedOutTrack(const Trk::Track *ptrTrack,
                                                                                    const Trk::TrackScore score,
                                                                                    Trk::ClusterSplitProbabilityContainer &splitProbContainer,
                                                                                    Trk::PRDtoTrackMap &prd_to_track_map,
                                                                                    int trackId /* = -1*/,
                                                                                    int subtrackId /* = -1*/) const
{
  // flag if the track is ok (true) or needs cleaning (false)
  bool TrkCouldBeAccepted        = true;
 
  // some counters used in the logic
  int  numUnused         = 0;
  int  numTRT_Unused     = 0;
  int  numShared         = 0;
  int  numWeightedShared = 0;
  bool thishasblayer     = false;
  bool hassharedblayer   = false;
  bool hassharedpixel    = false;
  bool firstisshared     = true; // logic is that it is set to false if we find a first hit unshared
 
  // let's remember the last 2 ROTs on the track
  const Trk::RIO_OnTrack* lastrot       = nullptr;
  const Trk::RIO_OnTrack* lastbutonerot = nullptr;
  int                     lastrotindex  = 0;
 
  // cut on TRT hits, might use eta dependent cuts here
  int  nCutTRT = m_minTRT_Hits;
  if (m_parameterization) {
    const DataVector<const Trk::TrackParameters>* vpar = ptrTrack->trackParameters();
    const Trk::TrackParameters*                    par = (*vpar)[0];
    // ME bugfix
    int expected = m_selectortool->minNumberDCs(par);
    if (expected > nCutTRT) nCutTRT = expected;
  }
 
  // get all TSOS the track
  const Trk::TrackStates* tsos = ptrTrack->trackStateOnSurfaces();
  ATH_MSG_DEBUG ("Study new Track "<< ptrTrack<<"\t , it has "<<tsos->size()<<"\t track states");
  ATH_MSG_DEBUG ("trackId "<< trackId <<", subtrackId "<<subtrackId);
 
  // is this a track from the pattern or a fitted track ?
  bool ispatterntrack = (ptrTrack->info().trackFitter()==Trk::TrackInfo::Unknown);
  if (ispatterntrack) {
    ATH_MSG_DEBUG ("==> this is a pattern track, outliers are good hits (reintegration) !");
  } else {
    ATH_MSG_DEBUG ("==> this is a refitted track, so we can use the chi2 ! ");
  }
 
  // some pre-processing of the summary information, if available, needed for special cuts
  int nPixelDeadSensor = -1;
  int nSCTDeadSensor   = -1;
  int npixel    = 0;
  int npixholes = 0;
  int nsctholes = 0;
  const Trk::TrackSummary* trkSummary=ptrTrack->trackSummary();
  if (trkSummary) {
    ATH_MSG_VERBOSE ("---> Found summary information");
    nPixelDeadSensor = trkSummary->get(Trk::numberOfPixelDeadSensors);
    nSCTDeadSensor   = trkSummary->get(Trk::numberOfSCTDeadSensors);
    npixel           = trkSummary->get(Trk::numberOfPixelHits);
    npixholes        = trkSummary->get(Trk::numberOfPixelHoles);
    nsctholes        = trkSummary->get(Trk::numberOfSCTHoles);
  }
  // set nDeadSensors to 0 in case trkSummary wasn't called with HoleSearch
  // (i.e. number of deadSensors not available)
  if (nPixelDeadSensor == -1) nPixelDeadSensor = 0;
  if (nSCTDeadSensor   == -1) nSCTDeadSensor   = 0;
  ATH_MSG_VERBOSE ("---> Number of dead si sensors: " << nPixelDeadSensor + nSCTDeadSensor);
 
  // possible classification of TSOS
  enum TsosTypes {
    // A measurement not yet used in any other track
    UnusedHit   = 1,
    // A measurement shared with another track
    SharedHit   = 2,
    // A hit that needs to be removed from the track
    RejectedHit = 3,
    // an outlier, to be copied in case
    Outlier     = 4,
    // other TSOS types to be copied in case
    OtherTsos   = 5
  };
  // create an array of types for each TSOS
  std::vector<int> tsosType;
  tsosType.resize(tsos->size());
 
  // loop over TSOS
  Trk::TrackStates::const_iterator iTsos    = tsos->begin();
  Trk::TrackStates::const_iterator iTsosEnd = tsos->end();
  for (int index = 0 ; iTsos != iTsosEnd ; ++iTsos, ++index) {
 
    // init array
    tsosType[index] = OtherTsos;
 
    // get measurment from TSOS
    const Trk::MeasurementBase* meas = (*iTsos)->measurementOnTrack();
 
    // if we do not have a measurement, we should just mark it
    if (!meas) {
      ATH_MSG_VERBOSE ("-> No measurement on TSOS, it is another type, to be copied over");
      tsosType[index] = OtherTsos;
      continue;
    }
 
    // ok, let try to get the ROT then
    const Trk::RIO_OnTrack* rot = dynamic_cast <const Trk::RIO_OnTrack*> (meas);
    if (!rot) {
      // could be a Pseudo-Measurement ?
      const Trk::PseudoMeasurementOnTrack* pseudo = dynamic_cast <const Trk::PseudoMeasurementOnTrack*> (meas);
      if (pseudo){
        ATH_MSG_VERBOSE ("-> Copy pseudo measurement");
      } else {
        ATH_MSG_WARNING ("-> Measurement is not a pseudo measurment, not yet supported, try to copy !");
      }
      tsosType[index] = OtherTsos;
      continue;
    }
 
    //
    // we have a TSOS with a measurement, keep analysing it
    //
 
    // let's get some information about the measurement
    const Identifier& id = rot->identify();
    bool isTRT           = m_detID->is_trt(id);
    bool isPixel         = m_detID->is_pixel(id);
    bool isBlayer        = isPixel ? m_detID->is_blayer(id) : false;
    bool isoutlier       = (*iTsos)->type(Trk::TrackStateOnSurface::Outlier);
 
    // do we have some b-layer hit here (sorting of TSOS is inside out)
    if (isBlayer && (!isoutlier || ispatterntrack)) thishasblayer = true;  // we may reintegrate outliers from pattern
 
    // special cut to remove problematic combinations in the pixels
    if ( isPixel && !thishasblayer && npixholes>0           &&  // a pixel hit, no b-layer, we do have pixel holes
         ( ( npixel==1 && !isoutlier ) ||                       // one pixel on track, it is not an additional outlier
           ( ispatterntrack && npixel==0 && isoutlier) )   ) {  // pattern track, no pixels, but an outlier (we may reintegrate it)
      ATH_MSG_VERBOSE ("-> Special case, problematic single pixel hit on track, reject it !");
      tsosType[index]    = RejectedHit;
      // mark track as bad !
      TrkCouldBeAccepted = false;
      continue;
    }
 
    // do we have an outlier (an not a pattern track) ?
    // if ( (isoutlier && !ispatterntrack) || !(m_detID->is_indet(id)) ) {
    if ( (isoutlier && !ispatterntrack) || !(m_detID->is_indet(id)) ) {
      ATH_MSG_VERBOSE ("-> Prd is outlier on a fitter track (or not InDet), copy it over");
      tsosType[index] = Outlier;
      continue;
    }
 
    // let's check if this is a shared hit (even if it is an outlier on a pattern track) ?
    if (!prd_to_track_map.isUsed(*(rot->prepRawData()))) {
      if ( !isoutlier ) {
        ATH_MSG_VERBOSE ("-> Prd is unused, copy it over");
      } else {
        ATH_MSG_VERBOSE ("-> Prd is outlier on a pattern track and is unused, copy it over");
      }
 
      tsosType[index] = UnusedHit;
      // increase some counters
      if (isTRT) numTRT_Unused++;
      else numUnused++;
      // remember if first hit is shared, we need that later
      if (numShared == 0) firstisshared = false;
      // remember the last 2 ROTs
      lastbutonerot = lastrot;
      lastrot       = rot;
      lastrotindex  = index;
 
      continue;
    }
 
    //
    // ok, we have a shared hit
    //
 
    // do we have an outlier and a pattern track, but the hit is shared, so reject it (we reintegrate it otherwise)
    if ( isoutlier && ispatterntrack ) {
      ATH_MSG_VERBOSE ("-> Shared Prd is outlier on a pattern track, we do not want to reintegrate it, so reject it ");
      tsosType[index]    = RejectedHit;
      // mark track as bad !
      TrkCouldBeAccepted = false;
      continue;
    }
 
    // first check if it is a shared TRT hit, this is not allowed
    if (isTRT) {
      ATH_MSG_VERBOSE ("-> Share TRT hit, drop it !");
      tsosType[index]    = RejectedHit;
      // mark track as bad !
      TrkCouldBeAccepted = false;
      continue;
    }
 
    /* consider hit to be a shared one, if
       - not too many tracks share this hit already
       - the score of the track is high enough to allow for shared hits
    */
    Trk::PRDtoTrackMap::ConstPrepRawDataTrackMapRange range = prd_to_track_map.onTracks(*(rot->prepRawData()));
    int                             numberOfTracksWithThisPrd = std::distance(range.first,range.second);
    ATH_MSG_VERBOSE ("---> number of tracks with this share Prd: " << numberOfTracksWithThisPrd << " maxtracks: " << m_maxTracksPerPRD);
 
    // see if we try keeping it as a shared hit ?
    if ( numberOfTracksWithThisPrd < m_maxTracksPerPRD  && // we do not allow to share with to many tracks
         score > m_minScoreShareTracks                  && // score needs to be good
         (!isPixel || npixholes<=0)                    ) { // we do not share pixels if there are holes in pixels
 
      // special treatment of share split pixel clusters...
      if (m_doPixelClusterSplitting && isPixel) {
        // get pixel cluster
        const InDet::PixelCluster* clus = dynamic_cast <const InDet::PixelCluster*> (rot->prepRawData());
 
        if ( !clus ) {
          ATH_MSG_WARNING ("-----> cast to Pixel cluster failed, should not happen !");
          // mark track as bad !
          TrkCouldBeAccepted = false; // we have to remove at least one PRD
          continue;
        } else {
 
          // split clusters are not allowed to be shared at all, unless
          const Trk::ClusterSplitProbabilityContainer::ProbabilityInfo &splitProb = splitProbContainer.splitProbability(clus);
          if ( splitProb.isSplit() )  {
            ATH_MSG_VERBOSE ("-----> Pixel cluster is split, reject shared hit !!!");
            tsosType[index]    = RejectedHit;
            // mark track as bad !
            TrkCouldBeAccepted = false; // we have to remove at least one PRD
            continue;
          }
 
          // is cluster compatible with being a shared cluster ?
          // A.S.: also a hack for the max size: allows large clusters that are exluded from the splitter to be shared
          //       needs isExcluded() flag in the future
          if (splitProb.splitProbability1() < m_sharedProbCut && clus->rdoList().size() <= size_t(m_maxSplitSize) ) {
            ATH_MSG_VERBOSE ("-----> Pixel cluster is not compatible with being shared (splitProb = "
                             << splitProb.splitProbability1() << ") , reject shared hit !!!");
            tsosType[index]    = RejectedHit;
            // mark track as bad !
            TrkCouldBeAccepted = false; // we have to remove at least one PRD
            continue;
          }
        }
      }
 
      ATH_MSG_VERBOSE ("---> Shared hit, but good track, let's enter hit in the list and try to keep it !");
      tsosType[index]   = SharedHit;
      numShared++;                             // increase counter
      numWeightedShared += (isPixel ? 2 : 1);  // increase counter
 
      // some additional bookkeeping, we need this later
      if (isPixel) {
        // ME: bugfix, either shared blayer or shared pixel
        if (isBlayer) hassharedblayer = true;
        else  hassharedpixel = true;
      }
      // remember the last 2 ROTs
      lastbutonerot = lastrot;
      lastrot       = rot;
      lastrotindex  = index;
 
      continue;
    }
 
    // ok, we failed to keep the share hit, let's reject it.
    ATH_MSG_VERBOSE ("---> Share hit and bad track, reject it !");
    tsosType[index]    = RejectedHit;
    // mark track as bad !
    TrkCouldBeAccepted = false; // we have to remove at least one PRD
  }
 
  // total number of hits with dead modules
  int totalSiHits = numUnused + nPixelDeadSensor + nSCTDeadSensor;
 
  // special cut, do not allow the last hit to be to far away or after to many holes
  if (ispatterntrack                                                                              && // pattern track and
      totalSiHits > m_minHits                                                                     && // we have enough hits on the track
      (lastrot && lastbutonerot)                                                                  && // has enough ROTs
      (lastrot->globalPosition()-lastbutonerot->globalPosition()).mag()>1000*CLHEP::mm) { // distance cut
    ATH_MSG_DEBUG ("Special cut on distance, reject last hit on track !");
    tsosType[lastrotindex] = RejectedHit;
    numUnused--; // update counter
    // mark track as bad !
    TrkCouldBeAccepted     = false;
  }
 
  // special cut, do not allow the last hit to be after to many holes
  if (ispatterntrack                                                                              && // pattern track and
      totalSiHits > m_minHits                                                                     && // we have enough hits on the track
      nsctholes>3 ) { // too many holes cut
    ATH_MSG_DEBUG ("Special cut on too many holes, reject last hit on track !");
    tsosType[lastrotindex] = RejectedHit;
    numUnused--; // update counter
    // mark track as bad !
    TrkCouldBeAccepted     = false;
  }
 
 
 
  // get chi2/NDF, if track is fitted
  if ( !ispatterntrack ) {
    double trackchi2 = 0.;
    if  (ptrTrack->fitQuality() && ptrTrack->fitQuality()->numberDoF()>0 )
      trackchi2 = ptrTrack->fitQuality()->chiSquared()/ptrTrack->fitQuality()->numberDoF();
 
    // if we have share hits and this is a bad track, we reject it
    if ( numShared > 0 && !ispatterntrack && trackchi2 > 3 ) {
      ATH_MSG_DEBUG ("Shared hits, we have a bad chi2 track, mark it as bad !");
      // mark track as bad !
      TrkCouldBeAccepted = false;
    }
  }
 
 
  // numTRT cut, special for back tracking
  if ( numTRT_Unused < nCutTRT) {
    ATH_MSG_DEBUG ("Track fails TRT hit cut, mark it as bad !");
    // mark track as bad !
    TrkCouldBeAccepted = false;
  }
 
  //
  // now see what to do with the track
  //
 
  // best case, we like this track and it passes this complex if statement
  if ( TrkCouldBeAccepted                                                    && // we did not mark the track as bad before
       ( !hassharedblayer || npixholes<=1 )                                  && // if blayer, at most 1 pixel hole
       !hassharedpixel                                                       && // no shared pixel hits
       ( ( totalSiHits >= m_minHits      && numShared == 0 )                 || // no shared and enough hits OR
         ( totalSiHits >= m_minNotShared && numWeightedShared <= m_maxShared && // shared hits and enough unique hits and shared hits with good quality
           ( totalSiHits + std::min(numShared,m_maxShared) ) >= m_minHits && score > m_minScoreShareTracks ) ) ) {
    ATH_MSG_DEBUG ("=> Suggest to keep track with "<<numShared<<" shared hits !");
    return std::make_tuple(static_cast<Trk::Track *>(nullptr),true); // keep input track
 
    // ok, failed that one, can we recover the track ?
  } else if ( numTRT_Unused >= nCutTRT           && // TRT track or no TRT at all (back tracking)
              ( totalSiHits >= m_minHits         || // we have enough hits OR
                ( totalSiHits >= m_minNotShared  && // shared hits and enough unique hits and shared hits with good quality
                  totalSiHits+std::min(numShared,m_maxShared) >= m_minHits && score > m_minScoreShareTracks ) ) ) {
    // catch, if this is cosmics, accept the incoming track
    if (m_cosmics) {
      ATH_MSG_DEBUG ("=> Cosmics, accept input track even with shared hits");
      return std::make_tuple(static_cast<Trk::Track *>(nullptr),true); // keep input track;
    }
 
    // if ( numShared == 0 && TrkCouldBeAccepted ) {
    // ATH_MSG_DEBUG ("=> Nothing to recover from, drop track !");
    // return std::make_tuple(static_cast<Trk::Track *>(nullptr),false); // reject input track;
    // }
 
    // Track is potentially ok, create a stripped down version from the unused hits and the allowed shared hits
    // join shared to unused hits, if requirements are met
 
    ATH_MSG_VERBOSE ("Trying to recover track, allow for some shared hits is possible.");
 
    // new TSOS vector
    std::vector<const Trk::TrackStateOnSurface*> newTSOS;
 
    // counter for the weighted number of added shared hits
    int cntIns = 0;
 
    // loop over all TSOS (and types) and copy the good ones over
    Trk::TrackStates::const_iterator iTsos    = tsos->begin();
    Trk::TrackStates::const_iterator iTsosEnd = tsos->end();
 
    for (int index = 0 ; iTsos != iTsosEnd ; ++iTsos,++index ) {
 
      // remove rejected hits
      if (tsosType[index] == RejectedHit) {
        ATH_MSG_VERBOSE ("-> Dropping rejected hit");
 
      } else if (tsosType[index] != SharedHit ) {
        ATH_MSG_VERBOSE ("-> Copy good TSOS");
        newTSOS.push_back(*iTsos);
 
      } else if (cntIns >= m_maxShared) {
        ATH_MSG_VERBOSE ("-> Too many share hits, dropping outer hit(s)");
 
      } else {
        ATH_MSG_VERBOSE ("-> Try to recover a shared hit");
 
        // get measurment from TSOS
        const Trk::MeasurementBase* meas = (*iTsos)->measurementOnTrack();
        // get ROT from this TSOS
        const Trk::RIO_OnTrack*      rot = dynamic_cast <const Trk::RIO_OnTrack*> (meas);
 
        if (!rot) {
          ATH_MSG_WARNING ("Cast to RIO_OnTrack failed, should never happen !");
          continue;
        }
 
        // is it a pixel cluster ?
        bool isPixel = m_detID->is_pixel(rot->identify());
 
        // find out how many tracks use this hit already
        Trk::PRDtoTrackMap::ConstPrepRawDataTrackMapRange range = prd_to_track_map.onTracks(*(rot->prepRawData()));
        int                           numberOfTracksWithThisPrd = std::distance(range.first,range.second);
        ATH_MSG_VERBOSE ("---> number of tracks with this shared Prd: " << numberOfTracksWithThisPrd << " maxtracks: " << m_maxTracksPerPRD);
 
        // check if this newly shared hit would exceed the shared hits limit of the already accepted track (**)
        int  iShared        = 0;
        int  othernpixel    = 0;
        bool otherhasblayer = false;
        if ( numberOfTracksWithThisPrd == 1 ) {
          // @TODO is it ensured that the prds of all tracks have been registered already ?
          std::vector< const Trk::PrepRawData* > prdsToCheck = m_assoTool->getPrdsOnTrack(prd_to_track_map,*(range.first->second));
          for (const Trk::PrepRawData* prd : prdsToCheck) {
            if (prd_to_track_map.isShared(*prd))
              ++iShared;
            if (m_detID->is_pixel(prd->identify())) {
              othernpixel++;
              if (m_detID->is_blayer(prd->identify())) otherhasblayer=true;
            }
          }
        }
 
        // now decide what to do, can we keep the shared hit
        if ( numberOfTracksWithThisPrd < m_maxTracksPerPRD            && // number of tracks sharing hit
             score > m_minScoreShareTracks                            && // score cut
             (!isPixel || !hassharedblayer || npixholes <= 0)         && // shared b-layer only if no pixel holes
             ( iShared < m_maxShared || (isPixel && !firstisshared) ) && // do not allow other accepted track to exceed the shared limit, if first pixel hit is shared
             (!isPixel || thishasblayer == otherhasblayer )           && // only allow shared pixel if both have blayer or both not
             (!isPixel || npixel >= othernpixel )                    ) { // only allow shared pixel if new track as at least as many pixel hits
 
          ATH_MSG_VERBOSE ("---> Accepted hit shared with " << numberOfTracksWithThisPrd << " tracks !");
          newTSOS.push_back(*iTsos);
          numUnused++; // update counter
 
          // update shared hit counter
          cntIns += (isPixel ? 2 : 1);
 
        } else {
          ATH_MSG_VERBOSE ("---> Reject hit shared with " << numberOfTracksWithThisPrd << " tracks !");
        }
      }
    }
 
    // this still may happen per (**) see above.
    if ( numUnused+nPixelDeadSensor+nSCTDeadSensor < m_minHits || newTSOS.size() <= 3 ) {
      ATH_MSG_DEBUG ("=> Too few hits, reject track with shared hits");
      return std::make_tuple(static_cast<Trk::Track *>(nullptr),false); // reject input track;
    }
 
    // check that this is not the input track
    if ( newTSOS.size() == tsos->size() ) {
      ATH_MSG_DEBUG ("=> Recovered input track, accept it !");
      return std::make_tuple(static_cast<Trk::Track *>(nullptr),true); // keep input track;
    } else {
      // ok, done, create subtrack
      Trk::Track* newTrack = createSubTrack(newTSOS,ptrTrack);
      if (!newTrack) {
        ATH_MSG_DEBUG ("=> Failed to create subtrack");
        return std::make_tuple(static_cast<Trk::Track *>(nullptr),false); // reject input track;
      }
 
      Trk::TrackInfo info;
      info.addPatternRecoAndProperties(ptrTrack->info());
      Trk::TrackInfo newInfo;
      newInfo.setPatternRecognitionInfo(Trk::TrackInfo::InDetAmbiTrackSelectionTool);
      info.addPatternReco(newInfo);
      newTrack->info().addPatternReco(ptrTrack->info());
 
      ATH_MSG_DEBUG ("=> Successfully created subtrack with shared hits recovered !");
      return std::make_tuple(newTrack,false); // new cleaned track, reject input track ;
    }
  } else {
    ATH_MSG_DEBUG ("=> Track is recommended to be dropped");
  }
 
  return std::make_tuple(static_cast<Trk::Track *>(nullptr),false); // reject input track;
}
 
//==========================================================================================
 
Trk::Track* InDet::InDetAmbiTrackSelectionTool::createSubTrack( const std::vector<const Trk::TrackStateOnSurface*>& tsos, const Trk::Track* track ) const
{
  int nmeas=0;
  for (const Trk::TrackStateOnSurface* tsosIt : tsos) {
    if (tsosIt->type(Trk::TrackStateOnSurface::Measurement)) nmeas++;
  }
  if (nmeas<3) {
    ATH_MSG_DEBUG ("Less than 3 measurements, reject track !");
    return nullptr;
  }
 
  auto vecTsos = std::make_unique<Trk::TrackStates>();
 
  // loop over TSOS, copy TSOS and push into vector
  for (const Trk::TrackStateOnSurface* tsosIt : tsos) {
    const Trk::TrackStateOnSurface* newTsos = new Trk::TrackStateOnSurface(*tsosIt);
    vecTsos->push_back(newTsos);
  }
 
  Trk::TrackInfo info;
  info.addPatternRecoAndProperties(track->info());
  Trk::TrackInfo newInfo;
  newInfo.setPatternRecognitionInfo(Trk::TrackInfo::InDetAmbiTrackSelectionTool);
  info.addPatternReco(newInfo);
 
  Trk::Track* newTrack = new Trk::Track(info, std::move(vecTsos),nullptr);
 
  return newTrack;
 
}