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// $Id: HitDropper.cc,v 1.10 2009/11/02 22:55:58 bendavid Exp $
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#include "MitEdm/Producers/interface/HitDropper.h"
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#include "DataFormats/TrackingRecHit/interface/InvalidTrackingRecHit.h"
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#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"
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#include "DataFormats/SiPixelDetId/interface/PXBDetId.h"
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#include "DataFormats/SiPixelDetId/interface/PXFDetId.h"
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#include "DataFormats/SiStripDetId/interface/TIBDetId.h"
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#include "DataFormats/SiStripDetId/interface/TIDDetId.h"
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#include "DataFormats/SiStripDetId/interface/TOBDetId.h"
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#include "DataFormats/SiStripDetId/interface/TECDetId.h"
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#include "DataFormats/MuonDetId/interface/DTLayerId.h"
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#include "DataFormats/MuonDetId/interface/CSCDetId.h"
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#include "DataFormats/MuonDetId/interface/RPCDetId.h"
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#include "TrackingTools/GeomPropagators/interface/HelixArbitraryPlaneCrossing.h"
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using namespace edm;
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using namespace mitedm;
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//--------------------------------------------------------------------------------------------------
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reco::HitPattern HitDropper::CorrectedHits(const reco::TransientTrack *tTrack,
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const ThreeVector &vtxPos) const
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{
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// Return reco::HitPattern structure for the given track with all hits occuring before vtxPos
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// on the track (relative to the primary vertex if given) removed.
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// This version of the function uses an iterative helix-plane intersector and does not (yet)
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// take into account the uncertainties in vertex position.
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const GlobalPoint vtxPoint(vtxPos.x(),vtxPos.y(),vtxPos.z());
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const TrajectoryStateClosestToPoint vtxTSCP = tTrack->trajectoryStateClosestToPoint(vtxPoint);
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reco::HitPattern hitPattern;
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int nHits = 0;
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for (uint hi=0; hi<tTrack->recHitsSize(); ++hi) {
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const TrackingRecHit *hit = tTrack->recHit(hi).get();
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DetId geoId = hit->geographicalId();
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if(geoId == uint32_t(0)) continue;
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const GeomDet *det = trackerGeo_->idToDet(geoId);
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HelixArbitraryPlaneCrossing c(HelixPlaneCrossing::PositionType(vtxTSCP.theState().position()),
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HelixPlaneCrossing::DirectionType(vtxTSCP.theState().momentum()),
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vtxTSCP.theState().transverseCurvature(),
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anyDirection);
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std::pair<bool,double> crossResult = c.pathLength(det->surface());
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if ( crossResult.first && crossResult.second >= 0 ) {
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hitPattern.set(*hit,nHits);
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nHits++;
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}
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}
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return hitPattern;
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}
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//--------------------------------------------------------------------------------------------------
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reco::HitPattern HitDropper::CorrectedHits(const reco::Track *track,
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const ThreeVector &vtxPos) const
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{
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// Build the transient track and then return the corrected HitPattern.
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reco::TransientTrack tTrack = builder_->build(track);
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return CorrectedHits(&tTrack, vtxPos);
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}
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//--------------------------------------------------------------------------------------------------
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reco::HitPattern HitDropper::CorrectedHits(const reco::Track *track,
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const ThreeVector &vtxPos,
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const ThreeVector &trkMom,
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Double_t lxyError,
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Double_t lzError,
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Double_t sigmaTolerance) const
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{
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// Return reco::HitPattern structure for the given track with all hits occuring before vtxPos
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// on the track (relative to the primary vertex if given) removed.
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// This version of the function determines this completely analytically, and taking the
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// vertex position uncertainty into account, which might be important for particles which decay
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// within a tracker layer.
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const LocalPoint nullLocal(0,0,0);
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reco::HitPattern hitPattern;
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int nHits = 0;
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for (uint hi=0; hi<track->recHitsSize(); ++hi) {
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const TrackingRecHit *hit = track->recHit(hi).get();
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DetId geoId = hit->geographicalId();
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if(geoId == uint32_t(0)) continue;
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const GeomDet *det = trackerGeo_->idToDet(geoId);
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const GlobalPoint cPos = det->toGlobal(nullLocal);
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const ThreeVector crossPos(cPos.x(), cPos.y(), cPos.z());
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const ThreeVector delta = crossPos - vtxPos;
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Double_t lengthOverSigma = 0;
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//calculate distance between vertex and approximate hit position, projected into
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//the appropriate plane/axis and compared to the uncertainty in vertex position
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//in that plane/axis
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if (IsBarrel(det)) {
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const ThreeVector trkMomXY(trkMom.x(), trkMom.y(), 0.0);
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Double_t deltaXY = delta.Dot(trkMomXY)/trkMomXY.R();
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lengthOverSigma = deltaXY/lxyError;
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}
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else if (IsDisk(det)) {
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Double_t deltaZ = delta.z()*trkMom.z()/fabs(trkMom.z());
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lengthOverSigma = deltaZ/lzError;
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}
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else
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throw edm::Exception(edm::errors::Configuration, "HitDropper::CorrectedHits\n")
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<< "Error! Detector element not in a valid barrel or disk layer." << std::endl;
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//add the hit only if it is after the vertex,
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//allowing for some uncertainty in the vertex position
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if ( lengthOverSigma>(-sigmaTolerance) ) {
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hitPattern.set(*hit,nHits);
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nHits++;
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}
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}
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return hitPattern;
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}
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//--------------------------------------------------------------------------------------------------
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reco::HitPattern HitDropper::CorrectedHitsAOD(const reco::Track *track,
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const ThreeVector &vtxPos,
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const ThreeVector &trkMom,
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Double_t lxyError,
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Double_t lzError,
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Double_t sigmaTolerance) const
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{
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// Return reco::HitPattern structure for the given track with all hits occuring before vtxPos
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// on the track (relative to the primary vertex if given) removed.
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// This version of the function determines this completely analytically, and taking the
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// vertex position uncertainty into account, which might be important for particles which decay
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// within a tracker layer. In order to function in AOD, the tracker geometry is used in an
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// approximate way, at the level of barrel and disk layers. The layer thickness is taken
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// into account in the uncertainty tolerance.
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//Figure out whether we should use the +z or -z side in the case of a disk layer
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int side = 0;
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if (track->pz() < 0)
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side = -1;
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else
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side = 1;
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int nHits = 0;
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reco::HitPattern hitPattern;
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const reco::HitPattern* inHitPatterns[3];
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inHitPatterns[0] = &track->hitPattern();
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inHitPatterns[1] = &track->trackerExpectedHitsInner();
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inHitPatterns[2] = &track->trackerExpectedHitsOuter();
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for (Int_t hp=0; hp<3; ++hp) {
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const reco::HitPattern &inhits = *inHitPatterns[hp];
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for (Int_t hi=0; hi<inhits.numberOfHits(); hi++) {
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uint32_t hit = inhits.getHitPattern(hi);
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uint32_t subdet = inhits.getSubStructure(hit);
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uint32_t layerid = inhits.getLayer(hit);
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const DetLayer *det = FindLayer(subdet,layerid,side);
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if (!det) continue;
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bool goodHit = false;
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//calculate distance between vertex and approximate hit position, projected into
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//the appropriate plane/axis and compared to the uncertainty in vertex position
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//in that plane/axis
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if (det->location()==GeomDetEnumerators::barrel) {
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const BarrelDetLayer *barrelDet = static_cast<const BarrelDetLayer*>(det);
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const double barrelRho = barrelDet->specificSurface().radius();
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const double barrelHalfThickness = barrelDet->specificSurface().bounds().thickness()/2.0;
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const ThreeVector crossPos(barrelRho*cos(track->phi()),barrelRho*sin(track->phi()),0.0);
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const ThreeVector delta = crossPos - vtxPos;
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const ThreeVector trkMomXY(trkMom.x(), trkMom.y(), 0.0);
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const double deltaXY = delta.Dot(trkMomXY)/trkMomXY.R();
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goodHit = deltaXY>(-sigmaTolerance*lxyError - barrelHalfThickness);
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}
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else if (det->location()==GeomDetEnumerators::endcap) {
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const ForwardDetLayer *forwardDet = static_cast<const ForwardDetLayer*>(det);
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const double diskZ = forwardDet->specificSurface().position().z();
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const double diskHalfThickness = forwardDet->specificSurface().bounds().thickness()/2.0;
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const double deltaZ = (diskZ - vtxPos.z())*trkMom.z()/fabs(trkMom.z());;
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goodHit = deltaZ>(-sigmaTolerance*lzError - diskHalfThickness);
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}
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else
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throw edm::Exception(edm::errors::Configuration, "HitDropper::CorrectedHitsAOD\n")
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<< "Error! Detector element not in a valid barrel or disk layer." << std::endl;
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//add the hit only if it is after the vertex,
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//allowing for some uncertainty in the vertex position
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if ( goodHit ) {
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bool isStereo = inhits.getSide(hit);
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DetId dummyid = det->basicComponents().front()->geographicalId();
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if (isStereo) {
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dummyid = StereoDetId(dummyid);
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}
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const TrackingRecHit::Type hitType = static_cast<TrackingRecHit::Type>(inhits.getHitType(hit));
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InvalidTrackingRecHit dummyhit(dummyid, hitType);
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hitPattern.set(dummyhit,nHits);
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if ( hit != hitPattern.getHitPattern(nHits) )
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throw edm::Exception(edm::errors::Configuration, "HitDropper::CorrectedHitsAOD\n")
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<< "Error! Mismatch in copying hit pattern." << std::endl;
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nHits++;
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}
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}
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}
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return hitPattern;
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}
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reco::HitPattern HitDropper::SharedHits(const reco::Track *t1, const reco::Track *t2) const
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{
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//Return a hit pattern corresponding to the hits on the two tracks which share clusters
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int nHits = 0;
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reco::HitPattern sharedHits;
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if (!t1->extra().isAvailable() || !t2->extra().isAvailable())
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return sharedHits;
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for (trackingRecHit_iterator iHit1 = t1->recHitsBegin(); iHit1 != t1->recHitsEnd(); ++iHit1) {
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const TrackingRecHit *hit1 = iHit1->get();
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if (hit1->isValid()) {
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for (trackingRecHit_iterator iHit2 = t2->recHitsBegin(); iHit2 != t2->recHitsEnd(); ++iHit2) {
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const TrackingRecHit *hit2 = iHit2->get();
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if (hit2->isValid() && hit1->sharesInput(hit2,TrackingRecHit::some)) {
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sharedHits.set(*hit1,nHits);
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nHits++;
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}
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}
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}
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}
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return sharedHits;
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}
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//--------------------------------------------------------------------------------------------------
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const DetLayer *HitDropper::FindLayer(int subdet, int layer, int side) const
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{
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// Find a given layer.
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switch(subdet) {
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case StripSubdetector::TIB:
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//edm::LogInfo(TkDetLayers) << "TIB layer n: " << TIBDetId(id).layer() ;
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return trackerGeoSearch_->tibLayers().at(layer-1);
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break;
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case StripSubdetector::TOB:
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//edm::LogInfo(TkDetLayers) << "TOB layer n: " << TOBDetId(id).layer() ;
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return trackerGeoSearch_->tobLayers().at(layer-1);
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break;
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case StripSubdetector::TID:
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//edm::LogInfo(TkDetLayers) << "TID wheel n: " << TIDDetId(id).wheel() ;
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if( side == -1 ) {
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return trackerGeoSearch_->negTidLayers().at(layer-1);
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}else if( side == 1 ) {
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return trackerGeoSearch_->posTidLayers().at(layer-1);
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}
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break;
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case StripSubdetector::TEC:
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//edm::LogInfo(TkDetLayers) << "TEC wheel n: " << TECDetId(id).wheel() ;
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if( side == -1 ) {
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return trackerGeoSearch_->negTecLayers().at(layer-1);
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} else if( side == 1 ) {
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return trackerGeoSearch_->posTecLayers().at(layer-1);
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}
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break;
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case PixelSubdetector::PixelBarrel:
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//edm::LogInfo(TkDetLayers) << "PixelBarrel layer n: " << PXBDetId(id).layer() ;
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return trackerGeoSearch_->pixelBarrelLayers().at(layer-1);
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break;
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case PixelSubdetector::PixelEndcap:
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//edm::LogInfo(TkDetLayers) << "PixelEndcap disk n: " << PXFDetId(id).disk() ;
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if(side == -1 ) {
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return trackerGeoSearch_->negPixelForwardLayers().at(layer-1);
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}else if( side == 1 ) {
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return trackerGeoSearch_->posPixelForwardLayers().at(layer-1);
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}
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break;
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default:
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return 0;
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// throw(something);
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}
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return 0; //just to avoid compile warnings
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}
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//--------------------------------------------------------------------------------------------------
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DetId HitDropper::StereoDetId(const DetId &i) const
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{
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// Deal with stereo det id.
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switch (i.det()) {
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case DetId::Tracker:
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switch (i.subdetId()) {
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case PixelSubdetector::PixelBarrel:
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case PixelSubdetector::PixelEndcap:
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return 0;
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case StripSubdetector::TIB:
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{
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TIBDetId id = i;
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if (id.isStereo())
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return id;
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else {
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const std::vector<unsigned int> idString = id.string();
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return TIBDetId(id.layer(),idString[0],idString[1],idString[2],id.module(),1);
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}
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}
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case StripSubdetector::TID:
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{
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TIDDetId id = i;
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if (id.isStereo())
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return id;
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else {
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const std::vector<unsigned int> idModule = id.module();
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return TIDDetId(id.side(),id.wheel(),id.ring(),idModule[0],idModule[1],1);
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}
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}
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case StripSubdetector::TOB:
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{
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TOBDetId id = i;
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if (id.isStereo())
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return id;
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else {
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const std::vector<unsigned int> idRod = id.rod();
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return TOBDetId(id.layer(),idRod[0],idRod[1],id.module(),1);
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}
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}
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case StripSubdetector::TEC:
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{
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TECDetId id = i;
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if (id.isStereo())
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return id;
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else {
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const std::vector<unsigned int> idPetal = id.petal();
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return TECDetId(id.side(),id.wheel(),idPetal[0],idPetal[1],id.ring(),id.module(),1);
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}
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}
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default:
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return 0;
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}
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break;
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default:
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return 0;
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}
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}
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