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// $Id: ProducerV2SS.cc,v 1.20 2009/12/15 23:27:34 bendavid Exp $
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#include "DataFormats/Common/interface/Handle.h"
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#include "DataFormats/TrackReco/interface/Track.h"
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#include "DataFormats/TrackReco/interface/TrackFwd.h"
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#include "MagneticField/Engine/interface/MagneticField.h"
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#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
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#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
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#include "TrackingTools/PatternTools/interface/ClosestApproachInRPhi.h"
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#include "MitEdm/Producers/interface/HitDropperRecord.h"
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#include "MitEdm/Producers/interface/HitDropper.h"
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#include "MitEdm/DataFormats/interface/Types.h"
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#include "MitEdm/DataFormats/interface/Collections.h"
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#include "MitEdm/DataFormats/interface/DecayPart.h"
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#include "MitEdm/DataFormats/interface/StablePart.h"
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#include "MitEdm/DataFormats/interface/StableData.h"
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#include "MitEdm/VertexFitInterface/interface/MvfInterface.h"
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#include "MitEdm/VertexFitInterface/interface/TrackParameters.h"
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#include "MitEdm/Producers/interface/ProducerV2SS.h"
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#include <TMath.h>
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using namespace std;
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using namespace edm;
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using namespace mitedm;
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using namespace mithep;
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//--------------------------------------------------------------------------------------------------
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ProducerV2SS::ProducerV2SS(const ParameterSet& cfg) :
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ProducerD2SS(cfg),
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rhoMin_ (cfg.getUntrackedParameter<double>("minRadius", 0.0)),
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massMin_ (cfg.getUntrackedParameter<double>("minMass", 0.0)),
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massMax_ (cfg.getUntrackedParameter<double>("maxMass", 3.0)),
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dZMax_ (cfg.getUntrackedParameter<double>("maxZDistance",5.0)),
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useHitDropper_(cfg.getUntrackedParameter<bool>("useHitDropper",true)),
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applyChargeConstraint_(cfg.getUntrackedParameter<bool> ("applyChargeConstraint",false))
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{
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// Constructor.
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}
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//--------------------------------------------------------------------------------------------------
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ProducerV2SS::~ProducerV2SS()
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{
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// Destructor.
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}
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//--------------------------------------------------------------------------------------------------
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void ProducerV2SS::produce(Event &evt, const EventSetup &setup)
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{
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// Produce the output collection.
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auto_ptr<DecayPartCol> pD(new DecayPartCol());
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// First input collection
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Handle<StablePartCol> hStables1;
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Handle<StablePartCol> hStables2;
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if (!GetProduct(iStables1_, hStables1, evt) ) {
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cout << "Couldn't get in collection in Producer V2SS" << endl;
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evt.put(pD);
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return;
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}
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const StablePartCol *pS1 = hStables1.product();
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// Second input collection
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if(!GetProduct(iStables2_, hStables2, evt)) {
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cout << "Couldn't get in collection in Producer V2SS" << endl;
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evt.put(pD);
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return;
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}
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const StablePartCol *pS2 = hStables2.product();
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//get hit dropper
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ESHandle<HitDropper> hDropper;
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const HitDropper *dropper = 0;
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if (useHitDropper_) {
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setup.get<HitDropperRecord>().get("HitDropper",hDropper);
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dropper = hDropper.product();
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}
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//Get Magnetic Field from event setup, taking value at (0,0,0)
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edm::ESHandle<MagneticField> magneticField;
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setup.get<IdealMagneticFieldRecord>().get(magneticField);
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const double bfield = magneticField->inTesla(GlobalPoint(0.,0.,0.)).z();
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edm::ESHandle<TransientTrackBuilder> hTransientTrackBuilder;
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setup.get<TransientTrackRecord>().get("TransientTrackBuilder",hTransientTrackBuilder);
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const TransientTrackBuilder *transientTrackBuilder = hTransientTrackBuilder.product();
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//construct intermediate collection of TrackParameters in mvf format for vertex fit
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std::vector<TrackParameters> trkPars1;
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for (UInt_t i = 0; i<pS1->size(); ++i) {
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const reco::Track *t = pS1->at(i).track();
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const reco::TransientTrack ttrk = transientTrackBuilder->build(t);
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TrackParameters cmsTrk(ttrk);
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TrackParameters mvfTrk = cmsTrk.mvfTrack();
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trkPars1.push_back(mvfTrk);
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}
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std::vector<TrackParameters> trkPars2;
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if (iStables1_ == iStables2_)
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trkPars2 = trkPars1;
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else for (UInt_t i = 0; i<pS2->size(); ++i) {
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const reco::Track *t = pS2->at(i).track();
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const reco::TransientTrack ttrk = transientTrackBuilder->build(t);
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TrackParameters cmsTrk(ttrk);
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TrackParameters mvfTrk = cmsTrk.mvfTrack();
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trkPars2.push_back(mvfTrk);
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}
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// -----------------------------------------------------------------------------------------------
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// Simple double loop
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// -----------------------------------------------------------------------------------------------
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if (0)
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cout << "Starting V finder loop" << endl;
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ClosestApproachInRPhi helixIntersector;
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//sX_y: X= pion or proton collection.
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//i, j = 2 loop particles.
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//ex.: s1_i and s2_i are same particle as pion and proton
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for (UInt_t i=0; i<pS1->size(); ++i) {
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const StablePart &s1 = pS1->at(i);
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const TrackParameters &trkPar1 = trkPars1.at(i);
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//const reco::Track * t1 = s1.track();
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UInt_t j;
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if (iStables1_ == iStables2_)
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j = i+1;
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else
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j = 0;
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TrajectoryStateTransform tsTransform;
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FreeTrajectoryState initialState1 = tsTransform.initialFreeState(*s1.track(),&*magneticField);
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for (; j<pS2->size(); ++j) {
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const StablePart &s2 = pS2->at(j);
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const TrackParameters &trkPar2 = trkPars2.at(j);
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if( applyChargeConstraint_ && (s1.charge() + s2.charge() != 0) ) continue;
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// do fast helix fit to check if there's any hope
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//
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//const reco::Track * t2 = s2.track();
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double dZ0 = -999;
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double dR0 = -999;
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double mass0 = 0.0;
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FreeTrajectoryState initialState2 = tsTransform.initialFreeState(*s2.track(),&*magneticField);
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helixIntersector.calculate(initialState1, initialState2);
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if (helixIntersector.status()) {
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dZ0 = fabs(helixIntersector.points().first.z() - helixIntersector.points().second.z());
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dR0 = helixIntersector.crossingPoint().perp();
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GlobalVector v1, v2;
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v1 = helixIntersector.trajectoryParameters().first.momentum();
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v2 = helixIntersector.trajectoryParameters().second.momentum();
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double e1 = sqrt(v1.mag2()+s1.mass()*s1.mass());
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double x1 = v1.x();
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double y1 = v1.y();
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double z1 = v1.z();
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double e2 = sqrt(v2.mag2()+s2.mass()*s2.mass());
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double x2 = v2.x();
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double y2 = v2.y();
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double z2 = v2.z();
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FourVector sum(x1+x2, y1+y2, z1+z2, e1+e2);
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mass0 = sqrt(sum.M2());
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}
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// Basic cuts on helix intersection
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if(mass0 > massMax_ || mass0<massMin_ || fabs(dZ0) > dZMax_ || dR0 < rhoMin_) continue;
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// -------------------------------------------------------------------------------------------
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// Do vertex fit for all pairs
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// -------------------------------------------------------------------------------------------
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mithep::MultiVertexFitterD fit;
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fit.init(bfield); // Reset to the magnetic field from the event setup
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fit.setChisqMax(100);
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fit.addTrack(*trkPar1.pars(),*trkPar1.cMat(),1,s1.mass(),MultiVertexFitterD::VERTEX_1);
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fit.addTrack(*trkPar2.pars(),*trkPar2.cMat(),2,s2.mass(),MultiVertexFitterD::VERTEX_1);
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if (fit.fit()){
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DecayPart *d = new DecayPart(oPid_,DecayPart::Fast);
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// Update temporarily some of the quantities (prob, chi2, nDoF, mass, lxy, pt, fourMomentum)
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d->setProb(fit.prob());
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d->setChi2(fit.chisq());
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d->setNdof(fit.ndof());
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FourVector p4Fitted(0.,0.,0.,0.);
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p4Fitted += fit.getTrackP4(1);
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p4Fitted += fit.getTrackP4(2);
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d->setFourMomentum(p4Fitted);
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d->setPosition (fit.getVertex (MultiVertexFitterD::VERTEX_1));
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d->setError (fit.getErrorMatrix(MultiVertexFitterD::VERTEX_1));
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float mass, massErr;
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const int trksIds[2] = { 1, 2 };
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mass = fit.getMass(2,trksIds,massErr);
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ThreeVector p3Fitted(p4Fitted.px(), p4Fitted.py(), p4Fitted.pz());
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//Get decay length in xy plane
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float dl, dlErr;
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dl = fit.getDecayLength (MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
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p3Fitted, dlErr);
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//Get Z decay length
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float dlz, dlzErr;
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dlz = fit.getZDecayLength(MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
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p3Fitted, dlzErr);
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//get impact parameter
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float dxy, dxyErr;
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dxy = fit.getImpactPar (MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
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p3Fitted, dxyErr);
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BasePartPtr ptr1(hStables1,i);
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BasePartPtr ptr2(hStables2,j);
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StableData c1(fit.getTrackP4(1).px(),fit.getTrackP4(1).py(), fit.getTrackP4(1).pz(), ptr1);
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StableData c2(fit.getTrackP4(2).px(),fit.getTrackP4(2).py(), fit.getTrackP4(2).pz(), ptr2);
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const ThreeVector vtxPos = fit.getVertex(MultiVertexFitterD::VERTEX_1);
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const ThreeVector trkMom1(fit.getTrackP4(1).px(),fit.getTrackP4(1).py(),
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fit.getTrackP4(1).pz());
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const ThreeVector trkMom2(fit.getTrackP4(2).px(),fit.getTrackP4(2).py(),
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fit.getTrackP4(2).pz());
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//build corrected HitPattern for StableData, removing hits before the fit vertex
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if (useHitDropper_) {
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reco::HitPattern hits1 = dropper->CorrectedHitsAOD(s1.track(),
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vtxPos,
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trkMom1,
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dlErr,
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dlzErr);
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reco::HitPattern hits2 = dropper->CorrectedHitsAOD(s2.track(),
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vtxPos,
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trkMom2,
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dlErr,
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dlzErr);
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c1.SetHits(hits1);
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c2.SetHits(hits2);
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c1.SetHitsFilled();
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c2.SetHitsFilled();
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reco::HitPattern sharedHits = dropper->SharedHits(s1.track(),s2.track());
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d->setSharedHits(sharedHits);
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}
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d->addStableChild (c1);
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d->addStableChild (c2);
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d->setFittedMass (mass);
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d->setFittedMassError(massErr);
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d->setLxy (dl);
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d->setLxyError (dlErr);
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d->setLxyToPv (dl);
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d->setLxyToPvError (dlErr);
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d->setLz (dlz);
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d->setLzError (dlzErr);
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d->setLzToPv (dlz);
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d->setLzToPvError (dlzErr);
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d->setDxy (dxy);
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d->setDxyError (dxyErr);
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d->setDxyToPv (dxy);
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d->setDxyToPvError (dxyErr);
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// put the result into our collection
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pD->push_back(*d);
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delete d;
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} //done processing fit
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} //end j loop
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} //end i loop
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// -----------------------------------------------------------------------------------------------
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// Write the collection even if it is empty
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// -----------------------------------------------------------------------------------------------
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if (0)
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cout << " V2SS::produce - " << pD->size() << " entries collection created -"
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<< " (Pid: " << oPid_ << ")\n";
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evt.put(pD);
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}
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// define this as a plug-in
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DEFINE_FWK_MODULE(ProducerV2SS);
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