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//
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// $Id: InFlightDecayRecoFinder.cc,v 1.2 2010/01/31 10:20:59 gpetrucc Exp $
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//
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/**
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\class pat::InFlightDecayRecoFinder InFlightDecayRecoFinder.h "PhysicsTools/PatAlgos/interface/InFlightDecayRecoFinder.h"
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\brief Use StandAlone track to define the 4-momentum of a PAT Muon (normally the global one is used)
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\author Giovanni Petrucciani
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\version $Id: InFlightDecayRecoFinder.cc,v 1.2 2010/01/31 10:20:59 gpetrucc Exp $
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*/
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#include <algorithm>
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#include "FWCore/Framework/interface/EDProducer.h"
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#include "FWCore/Framework/interface/Event.h"
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#include "FWCore/Framework/interface/ESHandle.h"
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#include "FWCore/ParameterSet/interface/ParameterSet.h"
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#include "FWCore/ParameterSet/interface/InputTag.h"
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#include "DataFormats/Math/interface/deltaR.h"
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#include "DataFormats/Common/interface/View.h"
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#include "DataFormats/MuonReco/interface/MuonFwd.h"
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#include "DataFormats/MuonReco/interface/Muon.h"
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#include "DataFormats/TrackReco/interface/Track.h"
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#include "DataFormats/VertexReco/interface/Vertex.h"
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#include "DataFormats/PatCandidates/interface/GenericParticle.h"
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#include "CommonTools/Utils/interface/StringCutObjectSelector.h"
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#include "TrackingTools/GeomPropagators/interface/Propagator.h"
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#include "TrackingTools/Records/interface/TrackingComponentsRecord.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 "Geometry/CommonDetUnit/interface/GlobalTrackingGeometry.h"
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#include "Geometry/CommonDetUnit/interface/GeomDet.h"
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#include "Geometry/Records/interface/GlobalTrackingGeometryRecord.h"
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#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
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#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
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#include <TrackingTools/PatternTools/interface/TwoTrackMinimumDistance.h>
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#include <TrackingTools/PatternTools/interface/TSCPBuilderNoMaterial.h>
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#include "TrackingTools/IPTools/interface/IPTools.h"
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#include "TrackingTools/TransientTrack/interface/TransientTrackBuilder.h"
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#include "TrackingTools/TransientTrack/interface/TransientTrack.h"
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#include "TrackingTools/Records/interface/TransientTrackRecord.h"
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#include "Math/GenVector/Boost.h"
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#include <boost/foreach.hpp>
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#define foreach BOOST_FOREACH
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class InFlightDecayRecoFinder : public edm::EDProducer {
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public:
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explicit InFlightDecayRecoFinder(const edm::ParameterSet & iConfig);
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virtual ~InFlightDecayRecoFinder() { }
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virtual void produce(edm::Event & iEvent, const edm::EventSetup & iSetup);
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private:
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/// input muons
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edm::InputTag muons_;
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/// input tracker tracks
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edm::InputTag tracks_;
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/// input primary vertex
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edm::InputTag vertices_;
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/// preselection for muons
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StringCutObjectSelector<reco::Muon> muonCut_;
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/// preselection for candidate "inner" tracks (hadrons that decay)
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StringCutObjectSelector<reco::Track> innerTrackCut_;
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/// preselection for candidate "outer" tracks (muons from decay)
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StringCutObjectSelector<reco::Track> outerTrackCut_;
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/// minimal deltaR to search for tracks around the muon
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double maxDeltaR2_;
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/// minimal deltaPt/pt to search for tracks around the muon
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double maxDeltaPtRel_;
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/// maximum distance between the two tracks
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double maxTwoTrackDist_;
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/// Use only variables available in AOD
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bool aodDataOnly_;
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/// Magnetic field for extrapolation
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edm::ESHandle<MagneticField> magfield_;
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/// Propagator for extrapolation
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edm::ESHandle<Propagator> propagator_;
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/// Global tracking geometry
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edm::ESHandle<GlobalTrackingGeometry> geometry_;
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/// Transient track builder, for better d0 determination
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edm::ESHandle<TransientTrackBuilder> ttBuilder_;
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struct EqByTrack {
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EqByTrack() : tk() {}
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EqByTrack(const reco::TrackRef & ref) : tk(ref) {}
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bool operator()(const reco::Muon &mu) const { return mu.track() == tk; }
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bool operator()(const reco::Muon &mu, const reco::TrackRef &tk) const { return mu.track() == tk; }
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bool operator()(const reco::TrackRef &tk, const reco::Muon &mu) const { return mu.track() == tk; }
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bool operator()(const reco::Muon &m1, const reco::Muon &m2) const { return m1.track() == m2.track(); }
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reco::TrackRef tk;
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};
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void collectTracks(const reco::Muon &mu, const edm::Handle<reco::TrackCollection> &tracks, std::vector<reco::TrackRef> & selected) {
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selected.clear();
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for (size_t i = 0, n = tracks->size(); i < n; ++i) {
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const reco::Track &tk = (*tracks)[i];
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if ((reco::deltaR2(mu, tk) < maxDeltaR2_ ) &&
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(fabs(mu.pt() - tk.pt())/mu.pt() < maxDeltaPtRel_) &&
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mu.charge() == tk.charge() ) {
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selected.push_back(reco::TrackRef(tracks,i));
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}
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}
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}
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struct DecayCandidate {
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DecayCandidate(reco::TrackRef inner, reco::TrackRef outer) :
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innerTrack(inner), outerTrack(outer), distance(-1) {}
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reco::TrackRef innerTrack; // never null
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reco::TrackRef outerTrack; // never null
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edm::Ptr<reco::Muon> innerMu; // may be null
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edm::Ptr<reco::Muon> outerMu; // may be null
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double distance;
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GlobalPoint decayPoint;
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reco::Particle::LorentzVector p4mu, p4nu, p4had;
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double theta, thetaStar;
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bool operator==(const DecayCandidate &other) {
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return (innerTrack == other.innerTrack) && (outerTrack == other.outerTrack);
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}
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};
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/// events to print out
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int printOut_;
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};
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InFlightDecayRecoFinder::InFlightDecayRecoFinder(const edm::ParameterSet & iConfig) :
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muons_(iConfig.getParameter<edm::InputTag>("muons")),
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tracks_(iConfig.getParameter<edm::InputTag>("tracks")),
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vertices_(iConfig.getParameter<edm::InputTag>("vertices")),
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muonCut_(iConfig.getParameter<std::string>("muonCut")),
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innerTrackCut_(iConfig.getParameter<std::string>("innerTrackCut")),
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outerTrackCut_(iConfig.getParameter<std::string>("outerTrackCut")),
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maxDeltaR2_(std::pow(iConfig.getParameter<double>("maxDeltaR"),2)),
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maxDeltaPtRel_(iConfig.getParameter<double>("maxDeltaPtRel")),
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maxTwoTrackDist_(iConfig.getParameter<double>("maxTwoTrackDist")),
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aodDataOnly_(iConfig.getParameter<bool>("aodDataOnly")),
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printOut_(iConfig.getUntrackedParameter<int32_t>("eventsToPrintOut",0))
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{
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produces<reco::TrackCollection>("inner");
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produces<reco::TrackCollection>("outer");
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produces<std::vector<reco::Muon> >("inner");
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produces<std::vector<reco::Muon> >("outer");
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produces<pat::GenericParticleCollection>();
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}
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void
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InFlightDecayRecoFinder::produce(edm::Event & iEvent, const edm::EventSetup & iSetup) {
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using namespace edm;
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using namespace std;
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// Get EventSetup data
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iSetup.get<IdealMagneticFieldRecord>().get(magfield_);
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//iSetup.get<TrackingComponentsRecord>().get("SteppingHelixPropagatorAny", propagator_);
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if (!aodDataOnly_) iSetup.get<GlobalTrackingGeometryRecord>().get(geometry_);
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iSetup.get<TransientTrackRecord>().get("TransientTrackBuilder", ttBuilder_);
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// Get Event data
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Handle<View<reco::Muon> > muons;
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iEvent.getByLabel(muons_, muons);
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Handle<reco::TrackCollection> tracks;
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iEvent.getByLabel(tracks_, tracks);
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Handle<std::vector<reco::Vertex> > vertices;
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iEvent.getByLabel(vertices_, vertices);
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auto_ptr<reco::TrackCollection> innerSelTks(new reco::TrackCollection());
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auto_ptr<reco::TrackCollection> outerSelTks(new reco::TrackCollection());
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auto_ptr<reco::MuonCollection> innerSelMus(new reco::MuonCollection());
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auto_ptr<reco::MuonCollection> outerSelMus(new reco::MuonCollection());
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auto_ptr<pat::GenericParticleCollection> output(new pat::GenericParticleCollection());
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std::vector<DecayCandidate> decayCandidates;
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typedef std::vector<reco::TrackRef> TkRefs;
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EqByTrack eq;
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TkRefs nearbyTracks;
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edm::View<reco::Muon>::const_iterator muBegin = muons->begin(), muEnd = muons->end();
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for (View<reco::Muon>::const_iterator itmu = muBegin; itmu != muEnd; ++itmu) {
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if (!muonCut_(*itmu)) continue;
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collectTracks(*itmu, tracks, nearbyTracks);
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if (printOut_) {
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std::cerr << "Seeding from muon with pt = " << itmu->pt() << ", eta = " << itmu->eta() << ", phi = " << itmu->phi() <<
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" track id " << itmu->track().key() <<
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( itmu->isGlobalMuon() ? " Glb" : "") << ( itmu->isTrackerMuon() ? " Trk" : "") << ( itmu->isStandAloneMuon() ? " Sta" : "") <<
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". found " << nearbyTracks.size() << " nearby tracks.\n";
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}
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for (TkRefs::const_iterator it1 = nearbyTracks.begin(), ed = nearbyTracks.end(); it1 != ed; ++it1) {
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if (!innerTrackCut_(**it1)) continue;
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if (printOut_) std::cerr << " inner track id " << it1->key() << " pt = " << (*it1)->pt() << ", eta = " << (*it1)->eta() << ", phi = " << (*it1)->phi() <<
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", valid hits = " << (*it1)->numberOfValidHits() <<
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", expected in/out = " << (*it1)->trackerExpectedHitsInner().numberOfLostHits() << " / " << (*it1)->trackerExpectedHitsOuter().numberOfLostHits() << std::endl;
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for (TkRefs::const_iterator it2 = nearbyTracks.begin(); it2 != ed; ++it2) {
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if (it1 == it2) continue;
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if (!outerTrackCut_(**it2)) continue;
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if (printOut_) std::cerr << " outer track id " << it2->key() << " pt = " << (*it2)->pt() << ", eta = " << (*it2)->eta() << ", phi = " << (*it2)->phi() <<
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", valid hits = " << (*it2)->numberOfValidHits() <<
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", expected in/out = " << (*it2)->trackerExpectedHitsInner().numberOfLostHits() << " / " << (*it2)->trackerExpectedHitsOuter().numberOfLostHits() << std::endl;
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if ((*it1)->charge() != (*it2)->charge()) continue;
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DecayCandidate cand(*it1,*it2);
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if (std::find(decayCandidates.begin(), decayCandidates.end(), cand) != decayCandidates.end()) {
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if (printOut_) std::cerr << " already seeded." << std::endl;
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continue; // can be seeded by both muons
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}
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edm::View<reco::Muon>::const_iterator innerMuIt = std::find_if(muBegin, muEnd, EqByTrack(*it1));
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edm::View<reco::Muon>::const_iterator outerMuIt = std::find_if(muBegin, muEnd, EqByTrack(*it2));
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if (innerMuIt != muEnd) { cand.innerMu = muons->ptrAt(innerMuIt - muBegin); }
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if (outerMuIt != muEnd) { cand.outerMu = muons->ptrAt(outerMuIt - muBegin); }
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TwoTrackMinimumDistance ttmd;
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TrajectoryStateTransform transformer;
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if (!aodDataOnly_) {
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TrajectoryStateOnSurface innerInnerTSOS = transformer.innerStateOnSurface(**it1, *geometry_, &*magfield_); // start from the two far states
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TrajectoryStateOnSurface outerOuterTSOS = transformer.outerStateOnSurface(**it2, *geometry_, &*magfield_); // so that distance is less biased by shared hits
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if (!ttmd.calculate(innerInnerTSOS, outerOuterTSOS)) { std::cerr << " TTMD failed :-( " << std::endl; continue; }
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} else {
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FreeTrajectoryState innerFTS = transformer.initialFreeState(**it1, &*magfield_); // start from the two far states
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FreeTrajectoryState outerFTS = transformer.initialFreeState(**it2, &*magfield_); // so that distance is less biased by shared hits
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if (!ttmd.calculate(innerFTS, outerFTS)) { std::cerr << " TTMD failed :-( " << std::endl; continue; }
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}
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cand.decayPoint = ttmd.crossingPoint();
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cand.distance = ttmd.distance();
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if (printOut_) std::cerr << " TTMD dist = " << cand.distance << ", R = " << cand.decayPoint.perp() << ", Z = " << cand.decayPoint.z() << std::endl;
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if (cand.distance > maxTwoTrackDist_) continue;
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typedef reco::Candidate::Vector Vector;
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typedef reco::Candidate::Point Point;
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typedef reco::Candidate::LorentzVector LorentzVector;
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TSCPBuilderNoMaterial tscpBuilder;
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Vector ph, pm;
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if (!aodDataOnly_) {
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TrajectoryStateOnSurface innerOuterTSOS = transformer.outerStateOnSurface(**it1, *geometry_, &*magfield_); // start from the two near states
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TrajectoryStateOnSurface outerInnerTSOS = transformer.innerStateOnSurface(**it2, *geometry_, &*magfield_); // so the material is more correct
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TrajectoryStateClosestToPoint innerTSCP = tscpBuilder(innerOuterTSOS, ttmd.crossingPoint());
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TrajectoryStateClosestToPoint outerTSCP = tscpBuilder(outerInnerTSOS, ttmd.crossingPoint());
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ph = Vector(innerTSCP.momentum());
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pm = Vector(outerTSCP.momentum());
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} else {
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FreeTrajectoryState innerFTS = transformer.initialFreeState(**it1, &*magfield_); // start from the two far states
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FreeTrajectoryState outerFTS = transformer.initialFreeState(**it2, &*magfield_); // so that distance is less biased by shared hits
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TrajectoryStateClosestToPoint innerTSCP = tscpBuilder(innerFTS, ttmd.crossingPoint());
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TrajectoryStateClosestToPoint outerTSCP = tscpBuilder(outerFTS, ttmd.crossingPoint());
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ph = Vector(innerTSCP.momentum());
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pm = Vector(outerTSCP.momentum());
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}
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Vector pn = ph-pm;
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cand.p4mu = LorentzVector(pm.x(), pm.y(), pm.z(), hypot(pm.r(), 0.10566));
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cand.p4nu = LorentzVector(pn.x(), pn.y(), pn.z(), pn.r());
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cand.p4had = cand.p4mu + cand.p4nu;
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cand.theta = asin(pm.Unit().Cross(ph.Unit()).r());
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Vector beta = cand.p4had.BoostToCM();
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ROOT::Math::Boost boostH(beta.x(), beta.y(), beta.z());
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LorentzVector p1star = boostH(cand.p4mu);
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cand.thetaStar = asin(cand.p4had.Vect().Unit().Cross(p1star.Vect().Unit()).r());
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if (printOut_) {
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if (eq(*it1,*itmu)) std::cerr << " outer track is the seed reco::Muon" << std::endl;
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else if (count_if(muons->begin(), muons->end(), EqByTrack(*it1))) std::cerr << " inner track is another reco::Muon" << std::endl;
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if (eq(*it2,*itmu)) std::cerr << " outer track is the seed reco::Muon" << std::endl;
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else if (count_if(muons->begin(), muons->end(), EqByTrack(*it2))) std::cerr << " outer track is another reco::Muon" << std::endl;
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std::cerr << " p(mu) = " << cand.p4mu.P() << std::endl;
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std::cerr << " p(nu) = " << cand.p4nu.P() << std::endl;
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std::cerr << " p(had) = " << cand.p4had.P() << std::endl;
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std::cerr << " p4(mu) = " << cand.p4mu << std::endl;
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std::cerr << " p4(nu) = " << cand.p4nu << std::endl;
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std::cerr << " p4(had) = " << cand.p4had << std::endl;
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std::cerr << " dist = " << cand.distance << std::endl;
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std::cerr << " mass = " << (cand.p4had.mass2() > 0 ? cand.p4had.mass() : -sqrt(-cand.p4had.mass2())) << std::endl;
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std::cerr << " theta = " << cand.theta << std::endl;
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std::cerr << " theta* = " << cand.thetaStar << std::endl;
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}
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decayCandidates.push_back(cand);
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innerSelTks->push_back(*cand.innerTrack);
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outerSelTks->push_back(*cand.outerTrack);
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if (cand.innerMu.isNonnull()) innerSelMus->push_back(*cand.innerMu);
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| 298 |
if (cand.outerMu.isNonnull()) outerSelMus->push_back(*cand.outerMu);
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| 299 |
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| 300 |
output->push_back(pat::GenericParticle());
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| 301 |
pat::GenericParticle &gp = output->back();
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| 302 |
/// ----- Base kinematics -----
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gp.setCharge(cand.innerTrack->charge());
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| 304 |
gp.setP4(math::PtEtaPhiMLorentzVector(cand.innerTrack->pt(),
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cand.innerTrack->eta(),
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cand.innerTrack->phi(),
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(cand.p4had.mass2() > 0 ? cand.p4had.mass() : -sqrt(-cand.p4had.mass2()))));
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gp.setVertex(cand.innerTrack->vertex());
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/// ----- References ------
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gp.setTrack(cand.innerTrack);
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reco::TrackRefVector tks;
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tks.push_back(cand.innerTrack);
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tks.push_back(cand.outerTrack);
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gp.setTracks(tks);
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if (cand.outerMu.isNonnull() && cand.outerMu->isStandAloneMuon()) {
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gp.setStandAloneMuon(cand.outerMu->standAloneMuon());
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| 317 |
}
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if (cand.outerMu.isNonnull() && cand.outerMu->isGlobalMuon()) {
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gp.setCombinedMuon(cand.outerMu->combinedMuon());
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| 320 |
}
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| 321 |
gp.addUserCand("innerMu", cand.innerMu);
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| 322 |
gp.addUserCand("outerMu", cand.outerMu);
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| 323 |
/// ---- Decay kinematics ----
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| 324 |
gp.addUserFloat("distance", cand.distance);
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| 325 |
gp.addUserFloat("decayRho", cand.decayPoint.perp());
|
| 326 |
gp.addUserFloat("decayZ", cand.decayPoint.z());
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| 327 |
gp.addUserData( "decayPoint", Point(cand.decayPoint));
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| 328 |
gp.addUserFloat("theta", cand.theta);
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| 329 |
gp.addUserFloat("thetaStar", cand.thetaStar);
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| 330 |
/// ---- Impact parameter stuff ----
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| 331 |
// first the basics
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| 332 |
reco::VertexRef vtx(vertices, 0); // primary vertex
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| 333 |
gp.addUserFloat("innerDxyVtx",cand.innerTrack->dxy(vtx->position()));
|
| 334 |
gp.addUserFloat("outerDxyVtx",cand.outerTrack->dxy(vtx->position()));
|
| 335 |
gp.addUserFloat("innerDszVtx",cand.innerTrack->dsz(vtx->position()));
|
| 336 |
gp.addUserFloat("outerDszVtx",cand.outerTrack->dsz(vtx->position()));
|
| 337 |
// the we get fancy
|
| 338 |
GlobalVector p4atVtx(cand.innerTrack->px(), cand.innerTrack->py(), cand.innerTrack->pz());
|
| 339 |
reco::TransientTrack innerTT = ttBuilder_->build(*cand.innerTrack);
|
| 340 |
reco::TransientTrack outerTT = ttBuilder_->build(*cand.outerTrack);
|
| 341 |
std::pair<bool,Measurement1D> innerTIP = IPTools::signedTransverseImpactParameter(innerTT, p4atVtx, *vtx);
|
| 342 |
std::pair<bool,Measurement1D> inner3DIP = IPTools::signedImpactParameter3D(innerTT, p4atVtx, *vtx);
|
| 343 |
std::pair<bool,Measurement1D> innerDL3D = IPTools::signedDecayLength3D(innerTT, p4atVtx, *vtx);
|
| 344 |
std::pair<bool,Measurement1D> outerTIP = IPTools::signedTransverseImpactParameter(outerTT, p4atVtx, *vtx);
|
| 345 |
std::pair<bool,Measurement1D> outer3DIP = IPTools::signedImpactParameter3D(outerTT, p4atVtx, *vtx);
|
| 346 |
std::pair<bool,Measurement1D> outerDL3D = IPTools::signedDecayLength3D(outerTT, p4atVtx, *vtx);
|
| 347 |
if (innerTIP.first ) { gp.addUserFloat("innerTIP", innerTIP.second.value()); gp.addUserFloat("innerTIPsig", innerTIP.second.significance()); }
|
| 348 |
if (inner3DIP.first) { gp.addUserFloat("inner3DIP",inner3DIP.second.value()); gp.addUserFloat("inner3DIPsig",inner3DIP.second.significance()); }
|
| 349 |
if (innerDL3D.first) { gp.addUserFloat("innerDL3D",innerDL3D.second.value()); gp.addUserFloat("innerDL3Dsig",innerDL3D.second.significance()); }
|
| 350 |
if (outerTIP.first ) { gp.addUserFloat("outerTIP", outerTIP.second.value()); gp.addUserFloat("outerTIPsig", outerTIP.second.significance()); }
|
| 351 |
if (outer3DIP.first) { gp.addUserFloat("outer3DIP",outer3DIP.second.value()); gp.addUserFloat("outer3DIPsig",outer3DIP.second.significance()); }
|
| 352 |
if (outerDL3D.first) { gp.addUserFloat("outerDL3D",outerDL3D.second.value()); gp.addUserFloat("outerDL3Dsig",outerDL3D.second.significance()); }
|
| 353 |
}
|
| 354 |
}
|
| 355 |
}
|
| 356 |
|
| 357 |
iEvent.put(innerSelTks, "inner");
|
| 358 |
iEvent.put(outerSelTks, "outer");
|
| 359 |
iEvent.put(innerSelMus, "inner");
|
| 360 |
iEvent.put(outerSelMus, "outer");
|
| 361 |
iEvent.put(output);
|
| 362 |
if (printOut_ > 0) { printOut_--; std::cerr << "\n" << std::endl; }
|
| 363 |
}
|
| 364 |
|
| 365 |
#include "FWCore/Framework/interface/MakerMacros.h"
|
| 366 |
DEFINE_FWK_MODULE(InFlightDecayRecoFinder);
|
