btau/plugins/HLTmumutktkVtxProducer.cc

0001 #include <algorithm>
0002 #include <cmath>
0003 #include <vector>
0004
0005 #include "FWCore/Framework/interface/ESHandle.h"
0006 #include "FWCore/MessageLogger/interface/MessageLogger.h"
0007 #include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
0008 #include "DataFormats/BeamSpot/interface/BeamSpot.h"
0009 #include "DataFormats/Math/interface/deltaR.h"
0010 #include "DataFormats/RecoCandidate/interface/RecoCandidate.h"
0011 #include "DataFormats/RecoCandidate/interface/RecoChargedCandidate.h"
0012 #include "DataFormats/VertexReco/interface/Vertex.h"
0013 #include "DataFormats/VertexReco/interface/VertexFwd.h"
0014 #include "TrackingTools/PatternTools/interface/TSCBLBuilderNoMaterial.h"
0015 #include "TrackingTools/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"
0016 #include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
0017 #include "RecoVertex/KalmanVertexFit/interface/KalmanVertexFitter.h"
0018 #include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"
0019 #include "HLTmumutktkVtxProducer.h"
0020
0021 using namespace edm;
0022 using namespace reco;
0023 using namespace std;
0024 using namespace trigger;
0025
0026 HLTmumutktkVtxProducer::HLTmumutktkVtxProducer(const edm::ParameterSet& iConfig)
0027     : transientTrackRecordToken_(esConsumes(edm::ESInputTag("", "TransientTrackBuilder"))),
0028       muCandTag_(iConfig.getParameter<edm::InputTag>("MuCand")),
0029       muCandToken_(consumes<reco::RecoChargedCandidateCollection>(muCandTag_)),
0030       trkCandTag_(iConfig.getParameter<edm::InputTag>("TrackCand")),
0031       trkCandToken_(consumes<reco::RecoChargedCandidateCollection>(trkCandTag_)),
0032       previousCandTag_(iConfig.getParameter<edm::InputTag>("PreviousCandTag")),
0033       previousCandToken_(consumes<trigger::TriggerFilterObjectWithRefs>(previousCandTag_)),
0034       mfName_(iConfig.getParameter<std::string>("SimpleMagneticField")),
0035       idealMagneticFieldRecordToken_(esConsumes(edm::ESInputTag("", mfName_))),
0036       thirdTrackMass_(iConfig.getParameter<double>("ThirdTrackMass")),
0037       fourthTrackMass_(iConfig.getParameter<double>("FourthTrackMass")),
0038       maxEta_(iConfig.getParameter<double>("MaxEta")),
0039       minPt_(iConfig.getParameter<double>("MinPt")),
0040       minInvMass_(iConfig.getParameter<double>("MinInvMass")),
0041       maxInvMass_(iConfig.getParameter<double>("MaxInvMass")),
0042       minTrkTrkMass_(iConfig.getParameter<double>("MinTrkTrkMass")),
0043       maxTrkTrkMass_(iConfig.getParameter<double>("MaxTrkTrkMass")),
0044       minD0Significance_(iConfig.getParameter<double>("MinD0Significance")),
0045       oppositeSign_(iConfig.getParameter<bool>("OppositeSign")),
0046       // minimum delta-R^2 threshold (with sign) for non-overlapping tracks
0047       overlapDR2_(iConfig.getParameter<double>("OverlapDR") * std::abs(iConfig.getParameter<double>("OverlapDR"))),
0048       beamSpotTag_(iConfig.getParameter<edm::InputTag>("BeamSpotTag")),
0049       beamSpotToken_(consumes<reco::BeamSpot>(beamSpotTag_)) {
0050   produces<VertexCollection>();
0051 }
0052
0053 void HLTmumutktkVtxProducer::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
0054   edm::ParameterSetDescription desc;
0055   desc.add<edm::InputTag>("MuCand", edm::InputTag("hltMuTracks"));
0056   desc.add<edm::InputTag>("TrackCand", edm::InputTag("hltMumukAllConeTracks"));
0057   desc.add<edm::InputTag>("PreviousCandTag", edm::InputTag("hltDisplacedmumuFilterDoubleMu4Jpsi"));
0058   desc.add<std::string>("SimpleMagneticField", "");
0059   desc.add<double>("ThirdTrackMass", 0.493677);
0060   desc.add<double>("FourthTrackMass", 0.493677);
0061   desc.add<double>("MaxEta", 2.5);
0062   desc.add<double>("MinPt", 0.0);
0063   desc.add<double>("MinInvMass", 0.0);
0064   desc.add<double>("MaxInvMass", 99999.);
0065   desc.add<double>("MinTrkTrkMass", 0.0);
0066   desc.add<double>("MaxTrkTrkMass", 99999.);
0067   desc.add<double>("MinD0Significance", 0.0);
0068   desc.add<bool>("OppositeSign", false);
0069   desc.add<double>("OverlapDR", 0.001);
0070   desc.add<edm::InputTag>("BeamSpotTag", edm::InputTag("hltOfflineBeamSpot"));
0071   descriptions.add("HLTmumutktkVtxProducer", desc);
0072 }
0073
0074 void HLTmumutktkVtxProducer::produce(edm::Event& iEvent, const edm::EventSetup& iSetup) {
0075   const double MuMass(0.106);
0076   const double MuMass2(MuMass * MuMass);
0077   const double thirdTrackMass2(thirdTrackMass_ * thirdTrackMass_);
0078   const double fourthTrackMass2(fourthTrackMass_ * fourthTrackMass_);
0079
0080   // get hold of muon trks
0081   Handle<RecoChargedCandidateCollection> mucands;
0082   iEvent.getByToken(muCandToken_, mucands);
0083
0084   // get the transient track builder
0085   auto const& theB = iSetup.getHandle(transientTrackRecordToken_);
0086
0087   // get the beamspot position
0088   edm::Handle<reco::BeamSpot> recoBeamSpotHandle;
0089   iEvent.getByToken(beamSpotToken_, recoBeamSpotHandle);
0090
0091   // get the b field
0092   auto const& bFieldHandle = iSetup.getHandle(idealMagneticFieldRecordToken_);
0093   const MagneticField* magField = bFieldHandle.product();
0094   TSCBLBuilderNoMaterial blsBuilder;
0095
0096   // get track candidates around displaced muons
0097   Handle<RecoChargedCandidateCollection> trkcands;
0098   iEvent.getByToken(trkCandToken_, trkcands);
0099
0100   unique_ptr<VertexCollection> vertexCollection(new VertexCollection());
0101
0102   // Ref to Candidate object to be recorded in filter object
0103   RecoChargedCandidateRef refMu1;
0104   RecoChargedCandidateRef refMu2;
0105   RecoChargedCandidateRef refTrk1;
0106   RecoChargedCandidateRef refTrk2;
0107
0108   double e1, e2, e3_m3, e3_m4, e4_m3, e4_m4;
0109   Particle::LorentzVector p, pBar, p1, p2, p3_m3, p3_m4, p4_m3, p4_m4, p_m3m4, p_m4m3;
0110
0111   if (mucands->size() < 2)
0112     return;
0113   if (trkcands->size() < 2)
0114     return;
0115
0116   RecoChargedCandidateCollection::const_iterator mucand1;
0117   RecoChargedCandidateCollection::const_iterator mucand2;
0118   RecoChargedCandidateCollection::const_iterator trkcand1;
0119   RecoChargedCandidateCollection::const_iterator trkcand2;
0120
0121   // get the objects passing the previous filter
0122   Handle<TriggerFilterObjectWithRefs> previousCands;
0123   iEvent.getByToken(previousCandToken_, previousCands);
0124
0125   vector<RecoChargedCandidateRef> vPrevCands;
0126   previousCands->getObjects(TriggerMuon, vPrevCands);
0127
0128   for (mucand1 = mucands->begin(); mucand1 != mucands->end(); ++mucand1) {
0129     TrackRef trk1 = mucand1->get<TrackRef>();
0130     LogDebug("HLTmumutktkVtxProducer") << " 1st muon: q*pt= " << trk1->charge() * trk1->pt() << ", eta= " << trk1->eta()
0131                                        << ", hits= " << trk1->numberOfValidHits();
0132
0133     //first check if this muon passed the previous filter
0134     if (!checkPreviousCand(trk1, vPrevCands))
0135       continue;
0136     // eta and pt cut
0137     if (fabs(trk1->eta()) > maxEta_)
0138       continue;
0139     if (trk1->pt() < minPt_)
0140       continue;
0141
0142     mucand2 = mucand1;
0143     ++mucand2;
0144     for (; mucand2 != mucands->end(); mucand2++) {
0145       TrackRef trk2 = mucand2->get<TrackRef>();
0146       if (overlap(trk1, trk2))
0147         continue;
0148
0149       LogDebug("HLTDisplacedMumukFilter") << " 2nd muon: q*pt= " << trk2->charge() * trk2->pt()
0150                                           << ", eta= " << trk2->eta() << ", hits= " << trk2->numberOfValidHits();
0151
0152       //first check if this muon passed the previous filter
0153       if (!checkPreviousCand(trk2, vPrevCands))
0154         continue;
0155       // eta and pt cut
0156       if (fabs(trk2->eta()) > maxEta_)
0157         continue;
0158       if (trk2->pt() < minPt_)
0159         continue;
0160
0161       //loop on track collection - trk1
0162       for (trkcand1 = trkcands->begin(); trkcand1 != trkcands->end(); ++trkcand1) {
0163         TrackRef trk3 = trkcand1->get<TrackRef>();
0164
0165         if (overlap(trk1, trk3))
0166           continue;
0167         if (overlap(trk2, trk3))
0168           continue;
0169
0170         LogDebug("HLTDisplacedMumukFilter") << " 3rd track: q*pt= " << trk3->charge() * trk3->pt()
0171                                             << ", eta= " << trk3->eta() << ", hits= " << trk3->numberOfValidHits();
0172
0173         // eta and pt cut
0174         if (fabs(trk3->eta()) > maxEta_)
0175           continue;
0176         if (trk3->pt() < minPt_)
0177           continue;
0178
0179         FreeTrajectoryState InitialFTS_Trk3 = initialFreeState(*trk3, magField);
0180         TrajectoryStateClosestToBeamLine tscb_Trk3(blsBuilder(InitialFTS_Trk3, *recoBeamSpotHandle));
0181         double d0sigTrk3 = tscb_Trk3.transverseImpactParameter().significance();
0182         if (d0sigTrk3 < minD0Significance_)
0183           continue;
0184
0185         //loop on track collection - trk2
0186         for (trkcand2 = trkcands->begin(); trkcand2 != trkcands->end(); ++trkcand2) {
0187           TrackRef trk4 = trkcand2->get<TrackRef>();
0188
0189           if (oppositeSign_) {
0190             if (trk3->charge() * trk4->charge() != -1)
0191               continue;
0192           }
0193           if (overlap(trk1, trk4))
0194             continue;
0195           if (overlap(trk2, trk4))
0196             continue;
0197           if (overlap(trk3, trk4))
0198             continue;
0199
0200           LogDebug("HLTDisplacedMumukFilter") << " 4th track: q*pt= " << trk4->charge() * trk4->pt()
0201                                               << ", eta= " << trk4->eta() << ", hits= " << trk4->numberOfValidHits();
0202
0203           // eta and pt cut
0204           if (fabs(trk4->eta()) > maxEta_)
0205             continue;
0206           if (trk4->pt() < minPt_)
0207             continue;
0208
0209           FreeTrajectoryState InitialFTS_Trk4 = initialFreeState(*trk4, magField);
0210           TrajectoryStateClosestToBeamLine tscb_Trk4(blsBuilder(InitialFTS_Trk4, *recoBeamSpotHandle));
0211           double d0sigTrk4 = tscb_Trk4.transverseImpactParameter().significance();
0212           if (d0sigTrk4 < minD0Significance_)
0213             continue;
0214
0215           // Combined system
0216           e1 = sqrt(trk1->momentum().Mag2() + MuMass2);
0217           e2 = sqrt(trk2->momentum().Mag2() + MuMass2);
0218           e3_m3 = sqrt(trk3->momentum().Mag2() + thirdTrackMass2);
0219           e3_m4 = sqrt(trk3->momentum().Mag2() + fourthTrackMass2);
0220           e4_m3 = sqrt(trk4->momentum().Mag2() + thirdTrackMass2);
0221           e4_m4 = sqrt(trk4->momentum().Mag2() + fourthTrackMass2);
0222
0223           p1 = Particle::LorentzVector(trk1->px(), trk1->py(), trk1->pz(), e1);
0224           p2 = Particle::LorentzVector(trk2->px(), trk2->py(), trk2->pz(), e2);
0225           p3_m3 = Particle::LorentzVector(trk3->px(), trk3->py(), trk3->pz(), e3_m3);
0226           p3_m4 = Particle::LorentzVector(trk3->px(), trk3->py(), trk3->pz(), e3_m4);
0227           p4_m3 = Particle::LorentzVector(trk4->px(), trk4->py(), trk4->pz(), e4_m3);
0228           p4_m4 = Particle::LorentzVector(trk4->px(), trk4->py(), trk4->pz(), e4_m4);
0229
0230           p = p1 + p2 + p3_m3 + p4_m4;
0231           pBar = p1 + p2 + p3_m4 + p4_m3;
0232           p_m3m4 = p3_m3 + p4_m4;
0233           p_m4m3 = p3_m4 + p4_m3;
0234
0235           //invariant mass cut
0236           if (!((p_m3m4.mass() > minTrkTrkMass_ && p_m3m4.mass() < maxTrkTrkMass_) ||
0237                 (p_m4m3.mass() > minTrkTrkMass_ && p_m4m3.mass() < maxTrkTrkMass_)))
0238             continue;
0239           if (!((p.mass() > minInvMass_ && p.mass() < maxInvMass_) ||
0240                 (pBar.mass() > minInvMass_ && pBar.mass() < maxInvMass_)))
0241             continue;
0242
0243           // do the vertex fit
0244           vector<TransientTrack> t_tks;
0245           t_tks.push_back((*theB).build(&trk1));
0246           t_tks.push_back((*theB).build(&trk2));
0247           t_tks.push_back((*theB).build(&trk3));
0248           t_tks.push_back((*theB).build(&trk4));
0249           if (t_tks.size() != 4)
0250             continue;
0251
0252           KalmanVertexFitter kvf;
0253           TransientVertex tv = kvf.vertex(t_tks);
0254           if (!tv.isValid())
0255             continue;
0256           Vertex vertex = tv;
0257
0258           vertexCollection->push_back(vertex);
0259         }
0260       }
0261     }
0262   }
0263   iEvent.put(std::move(vertexCollection));
0264 }
0265
0266 FreeTrajectoryState HLTmumutktkVtxProducer::initialFreeState(const reco::Track& tk, const MagneticField* field) {
0267   Basic3DVector<float> pos(tk.vertex());
0268   GlobalPoint gpos(pos);
0269   Basic3DVector<float> mom(tk.momentum());
0270   GlobalVector gmom(mom);
0271   GlobalTrajectoryParameters par(gpos, gmom, tk.charge(), field);
0272   CurvilinearTrajectoryError err(tk.covariance());
0273   return FreeTrajectoryState(par, err);
0274 }
0275
0276 bool HLTmumutktkVtxProducer::overlap(const TrackRef& trackref1, const TrackRef& trackref2) {
0277   return (reco::deltaR2(trackref1->eta(), trackref1->phi(), trackref2->eta(), trackref2->phi()) < overlapDR2_);
0278 }
0279
0280 bool HLTmumutktkVtxProducer::checkPreviousCand(const TrackRef& trackref,
0281                                                const vector<RecoChargedCandidateRef>& refVect) const {
0282   bool ok = false;
0283   for (auto& i : refVect) {
0284     if (i->get<TrackRef>() == trackref) {
0285       ok = true;
0286       break;
0287     }
0288   }
0289   return ok;
0290 }