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PFTauTransverseImpactParameters.cc
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PFTauTransverseImpactParameters.cc
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/* class PFTauTransverseImpactParamters
* EDProducer of the
* authors: Ian M. Nugent
* This work is based on the impact parameter work by Rosamaria Venditti and reconstructing the 3 prong taus.
* The idea of the fully reconstructing the tau using a kinematic fit comes from
* Lars Perchalla and Philip Sauerland Theses under Achim Stahl supervision. This
* work was continued by Ian M. Nugent and Vladimir Cherepanov.
* Thanks goes to Christian Veelken and Evan Klose Friis for their help and suggestions.
*/
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Utilities/interface/Exception.h"
#include <FWCore/ParameterSet/interface/ConfigurationDescriptions.h>
#include <FWCore/ParameterSet/interface/ParameterSetDescription.h>
#include "TrackingTools/TransientTrack/interface/TransientTrackBuilder.h"
#include "TrackingTools/Records/interface/TransientTrackRecord.h"
#include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"
#include "RecoBTag/SecondaryVertex/interface/SecondaryVertex.h"
#include "TrackingTools/IPTools/interface/IPTools.h"
#include "RecoVertex/VertexPrimitives/interface/ConvertToFromReco.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalTrajectoryExtrapolatorToLine.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalImpactPointExtrapolator.h"
#include "DataFormats/TauReco/interface/PFTau.h"
#include "DataFormats/TauReco/interface/PFTauFwd.h"
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/TauReco/interface/PFTauTransverseImpactParameter.h"
#include "DataFormats/TauReco/interface/PFTauTransverseImpactParameterFwd.h"
#include "DataFormats/PatCandidates/interface/PackedCandidate.h"
#include "DataFormats/Common/interface/Association.h"
#include "DataFormats/Common/interface/AssociationVector.h"
#include "DataFormats/Common/interface/RefProd.h"
#include "TMath.h"
#include <memory>
using namespace reco;
using namespace edm;
using namespace std;
class PFTauTransverseImpactParameters : public edm::stream::EDProducer<> {
public:
enum CMSSWPerigee { aCurv = 0, aTheta, aPhi, aTip, aLip };
explicit PFTauTransverseImpactParameters(const edm::ParameterSet& iConfig);
~PFTauTransverseImpactParameters() override;
void produce(edm::Event&, const edm::EventSetup&) override;
static void fillDescriptions(edm::ConfigurationDescriptions& descriptions);
private:
edm::EDGetTokenT<std::vector<reco::PFTau>> PFTauToken_;
edm::EDGetTokenT<edm::AssociationVector<PFTauRefProd, std::vector<reco::VertexRef>>> PFTauPVAToken_;
edm::EDGetTokenT<edm::AssociationVector<PFTauRefProd, std::vector<std::vector<reco::VertexRef>>>> PFTauSVAToken_;
const edm::ESGetToken<TransientTrackBuilder, TransientTrackRecord> transTrackBuilderToken_;
bool useFullCalculation_;
};
PFTauTransverseImpactParameters::PFTauTransverseImpactParameters(const edm::ParameterSet& iConfig)
: PFTauToken_(consumes<std::vector<reco::PFTau>>(iConfig.getParameter<edm::InputTag>("PFTauTag"))),
PFTauPVAToken_(consumes<edm::AssociationVector<PFTauRefProd, std::vector<reco::VertexRef>>>(
iConfig.getParameter<edm::InputTag>("PFTauPVATag"))),
PFTauSVAToken_(consumes<edm::AssociationVector<PFTauRefProd, std::vector<std::vector<reco::VertexRef>>>>(
iConfig.getParameter<edm::InputTag>("PFTauSVATag"))),
transTrackBuilderToken_(esConsumes(edm::ESInputTag{"", "TransientTrackBuilder"})),
useFullCalculation_(iConfig.getParameter<bool>("useFullCalculation")) {
produces<edm::AssociationVector<PFTauRefProd, std::vector<reco::PFTauTransverseImpactParameterRef>>>();
produces<PFTauTransverseImpactParameterCollection>("PFTauTIP");
}
PFTauTransverseImpactParameters::~PFTauTransverseImpactParameters() {}
namespace {
inline const reco::Track* getTrack(const Candidate& cand) {
const PFCandidate* pfCandPtr = dynamic_cast<const PFCandidate*>(&cand);
if (pfCandPtr != nullptr) {
if (pfCandPtr->trackRef().isNonnull())
return pfCandPtr->trackRef().get();
else if (pfCandPtr->gsfTrackRef().isNonnull())
return pfCandPtr->gsfTrackRef().get();
else
return nullptr;
}
const pat::PackedCandidate* packedCand = dynamic_cast<const pat::PackedCandidate*>(&cand);
if (packedCand != nullptr && packedCand->hasTrackDetails())
return &packedCand->pseudoTrack();
return nullptr;
}
} // namespace
void PFTauTransverseImpactParameters::produce(edm::Event& iEvent, const edm::EventSetup& iSetup) {
// Obtain Collections
auto const& transTrackBuilder = iSetup.getData(transTrackBuilderToken_);
edm::Handle<std::vector<reco::PFTau>> Tau;
iEvent.getByToken(PFTauToken_, Tau);
edm::Handle<edm::AssociationVector<PFTauRefProd, std::vector<reco::VertexRef>>> PFTauPVA;
iEvent.getByToken(PFTauPVAToken_, PFTauPVA);
edm::Handle<edm::AssociationVector<PFTauRefProd, std::vector<std::vector<reco::VertexRef>>>> PFTauSVA;
iEvent.getByToken(PFTauSVAToken_, PFTauSVA);
// Set Association Map
auto AVPFTauTIP =
std::make_unique<edm::AssociationVector<PFTauRefProd, std::vector<reco::PFTauTransverseImpactParameterRef>>>(
PFTauRefProd(Tau));
auto TIPCollection_out = std::make_unique<PFTauTransverseImpactParameterCollection>();
reco::PFTauTransverseImpactParameterRefProd TIPRefProd_out =
iEvent.getRefBeforePut<reco::PFTauTransverseImpactParameterCollection>("PFTauTIP");
// For each Tau Run Algorithim
if (Tau.isValid()) {
for (reco::PFTauCollection::size_type iPFTau = 0; iPFTau < Tau->size(); iPFTau++) {
reco::PFTauRef RefPFTau(Tau, iPFTau);
const reco::VertexRef PV = PFTauPVA->value(RefPFTau.key());
const std::vector<reco::VertexRef> SV = PFTauSVA->value(RefPFTau.key());
double dxy(-999), dxy_err(-999);
reco::Vertex::Point poca(0, 0, 0);
double ip3d(-999), ip3d_err(-999);
reco::Vertex::Point ip3d_poca(0, 0, 0);
if (RefPFTau->leadChargedHadrCand().isNonnull()) {
const reco::Track* track = getTrack(*RefPFTau->leadChargedHadrCand());
if (track != nullptr) {
if (useFullCalculation_) {
reco::TransientTrack transTrk = transTrackBuilder.build(*track);
GlobalVector direction(
RefPFTau->p4().px(), RefPFTau->p4().py(), RefPFTau->p4().pz()); //To compute sign of IP
std::pair<bool, Measurement1D> signed_IP2D =
IPTools::signedTransverseImpactParameter(transTrk, direction, (*PV));
dxy = signed_IP2D.second.value();
dxy_err = signed_IP2D.second.error();
std::pair<bool, Measurement1D> signed_IP3D = IPTools::signedImpactParameter3D(transTrk, direction, (*PV));
ip3d = signed_IP3D.second.value();
ip3d_err = signed_IP3D.second.error();
TransverseImpactPointExtrapolator extrapolator(transTrk.field());
GlobalPoint pos =
extrapolator.extrapolate(transTrk.impactPointState(), RecoVertex::convertPos(PV->position()))
.globalPosition();
poca = reco::Vertex::Point(pos.x(), pos.y(), pos.z());
AnalyticalImpactPointExtrapolator extrapolator3D(transTrk.field());
GlobalPoint pos3d =
extrapolator3D.extrapolate(transTrk.impactPointState(), RecoVertex::convertPos(PV->position()))
.globalPosition();
ip3d_poca = reco::Vertex::Point(pos3d.x(), pos3d.y(), pos3d.z());
} else {
dxy_err = track->d0Error();
dxy = track->dxy(PV->position());
ip3d_err = track->dzError(); //store dz, ip3d not available
ip3d = track->dz(PV->position()); //store dz, ip3d not available
}
}
}
if (!SV.empty()) {
reco::Vertex::CovarianceMatrix cov;
reco::Vertex::Point v(SV.at(0)->x() - PV->x(), SV.at(0)->y() - PV->y(), SV.at(0)->z() - PV->z());
for (int i = 0; i < reco::Vertex::dimension; i++) {
for (int j = 0; j < reco::Vertex::dimension; j++) {
cov(i, j) = SV.at(0)->covariance(i, j) + PV->covariance(i, j);
}
}
GlobalVector direction(RefPFTau->px(), RefPFTau->py(), RefPFTau->pz());
double vSig = SecondaryVertex::computeDist3d(*PV, *SV.at(0), direction, true).significance();
reco::PFTauTransverseImpactParameter TIPV(poca, dxy, dxy_err, ip3d_poca, ip3d, ip3d_err, PV, v, vSig, SV.at(0));
reco::PFTauTransverseImpactParameterRef TIPVRef =
reco::PFTauTransverseImpactParameterRef(TIPRefProd_out, TIPCollection_out->size());
TIPCollection_out->push_back(TIPV);
AVPFTauTIP->setValue(iPFTau, TIPVRef);
} else {
reco::PFTauTransverseImpactParameter TIPV(poca, dxy, dxy_err, ip3d_poca, ip3d, ip3d_err, PV);
reco::PFTauTransverseImpactParameterRef TIPVRef =
reco::PFTauTransverseImpactParameterRef(TIPRefProd_out, TIPCollection_out->size());
TIPCollection_out->push_back(TIPV);
AVPFTauTIP->setValue(iPFTau, TIPVRef);
}
}
}
iEvent.put(std::move(TIPCollection_out), "PFTauTIP");
iEvent.put(std::move(AVPFTauTIP));
}
void PFTauTransverseImpactParameters::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
// PFTauTransverseImpactParameters
edm::ParameterSetDescription desc;
desc.add<edm::InputTag>("PFTauPVATag", edm::InputTag("PFTauPrimaryVertexProducer"));
desc.add<bool>("useFullCalculation", false);
desc.add<edm::InputTag>("PFTauTag", edm::InputTag("hpsPFTauProducer"));
desc.add<edm::InputTag>("PFTauSVATag", edm::InputTag("PFTauSecondaryVertexProducer"));
descriptions.add("PFTauTransverseImpactParameters", desc);
}
DEFINE_FWK_MODULE(PFTauTransverseImpactParameters);