|
|
|
Classes | |
| struct | Plots |
Public Member Functions | |
| virtual void | analyze (const edm::Event &event, const edm::EventSetup &es) |
| virtual void | beginJob () |
| PatBJetTrackAnalyzer (const edm::ParameterSet ¶ms) | |
| constructor and destructor | |
| ~PatBJetTrackAnalyzer () | |
Private Types | |
| enum | Flavour { ALL_JETS = 0, UDSG_JETS, C_JETS, B_JETS, NONID_JETS, N_JET_TYPES } |
Private Attributes | |
| edm::InputTag | beamSpot_ |
| TH1 * | flavours_ |
| double | jetEtaCut_ |
| double | jetPtCut_ |
| edm::InputTag | jets_ |
| double | maxDeltaR_ |
| unsigned int | minPixelHits_ |
| double | minPt_ |
| unsigned int | minTotalHits_ |
| unsigned int | nThTrack_ |
| struct PatBJetTrackAnalyzer::Plots | plots_ [N_JET_TYPES] |
| edm::InputTag | primaryVertices_ |
| edm::InputTag | tracks_ |
Definition at line 30 of file PatBJetTrackAnalyzer.cc.
enum PatBJetTrackAnalyzer::Flavour [private] |
Definition at line 59 of file PatBJetTrackAnalyzer.cc.
{
ALL_JETS = 0,
UDSG_JETS,
C_JETS,
B_JETS,
NONID_JETS,
N_JET_TYPES
};
| PatBJetTrackAnalyzer::PatBJetTrackAnalyzer | ( | const edm::ParameterSet & | params | ) |
constructor and destructor
Definition at line 79 of file PatBJetTrackAnalyzer.cc.
:
jets_(params.getParameter<edm::InputTag>("jets")),
tracks_(params.getParameter<edm::InputTag>("tracks")),
beamSpot_(params.getParameter<edm::InputTag>("beamSpot")),
primaryVertices_(params.getParameter<edm::InputTag>("primaryVertices")),
jetPtCut_(params.getParameter<double>("jetPtCut")),
jetEtaCut_(params.getParameter<double>("jetEtaCut")),
maxDeltaR_(params.getParameter<double>("maxDeltaR")),
minPt_(params.getParameter<double>("minPt")),
minPixelHits_(params.getParameter<unsigned int>("minPixelHits")),
minTotalHits_(params.getParameter<unsigned int>("minTotalHits")),
nThTrack_(params.getParameter<unsigned int>("nThTrack"))
{
}
| PatBJetTrackAnalyzer::~PatBJetTrackAnalyzer | ( | ) |
Definition at line 94 of file PatBJetTrackAnalyzer.cc.
{
}
| void PatBJetTrackAnalyzer::analyze | ( | const edm::Event & | event, |
| const edm::EventSetup & | es | ||
| ) | [virtual] |
Implements edm::EDAnalyzer.
Definition at line 179 of file PatBJetTrackAnalyzer.cc.
References abs, ALL_JETS, PatBJetTrackAnalyzer::Plots::allDeltaR, PatBJetTrackAnalyzer::Plots::allIP, PatBJetTrackAnalyzer::Plots::allIPErr, PatBJetTrackAnalyzer::Plots::allIPSig, B_JETS, ExpressReco_HICollisions_FallBack::beamSpot, beamSpot_, C_JETS, deltaR(), Measurement1D::error(), reco::flavour(), flavours_, metsig::jet, jetEtaCut_, jetPtCut_, jets_, maxDeltaR_, minPixelHits_, minPt_, minTotalHits_, PatBJetTrackAnalyzer::Plots::negativeIP, PatBJetTrackAnalyzer::Plots::negativeIPErr, PatBJetTrackAnalyzer::Plots::negativeIPSig, NONID_JETS, nThTrack_, PatBJetTrackAnalyzer::Plots::nTracks, plots_, primaryVertices_, Measurement1D::significance(), significanceHigher(), python::multivaluedict::sort(), ExpressReco_HICollisions_FallBack::track, PatBJetTrackAnalyzer::Plots::trackIP, PatBJetTrackAnalyzer::Plots::trackIPErr, PatBJetTrackAnalyzer::Plots::trackIPSig, tracks_, UDSG_JETS, and Measurement1D::value().
{
// handle to the primary vertex collection
edm::Handle<reco::VertexCollection> pvHandle;
event.getByLabel(primaryVertices_, pvHandle);
// handle to the tracks collection
edm::Handle<reco::TrackCollection> tracksHandle;
event.getByLabel(tracks_, tracksHandle);
// handle to the jets collection
edm::Handle<pat::JetCollection> jetsHandle;
event.getByLabel(jets_, jetsHandle);
// handle to the beam spot
edm::Handle<reco::BeamSpot> beamSpot;
event.getByLabel(beamSpot_, beamSpot);
// rare case of no reconstructed primary vertex
if (pvHandle->empty())
return;
// extract the position of the (most probable) reconstructed vertex
math::XYZPoint pv = (*pvHandle)[0].position();
// now go through all jets
for(pat::JetCollection::const_iterator jet = jetsHandle->begin();
jet != jetsHandle->end(); ++jet) {
// only look at jets that pass the pt and eta cut
if (jet->pt() < jetPtCut_ ||
std::abs(jet->eta()) > jetEtaCut_)
continue;
Flavour flavour;
// find out the jet flavour (differs between quark and anti-quark)
switch(std::abs(jet->partonFlavour())) {
case 1:
case 2:
case 3:
case 21:
flavour = UDSG_JETS;
break;
case 4:
flavour = C_JETS;
break;
case 5:
flavour = B_JETS;
break;
default:
flavour = NONID_JETS;
}
// simply count the number of accepted jets
flavours_->Fill(ALL_JETS);
flavours_->Fill(flavour);
// this vector will contain IP value / error pairs
std::vector<Measurement1D> ipValErr;
// Note: PAT is also able to store associated tracks
// within the jet object, so we don't have to do the
// matching ourselves
// (see ->associatedTracks() method)
// However, using this we can't play with the DeltaR cone
// withour rerunning the PAT producer
// now loop through all tracks
for(reco::TrackCollection::const_iterator track = tracksHandle->begin();
track != tracksHandle->end(); ++track) {
// check the quality criteria
if (track->pt() < minPt_ ||
track->hitPattern().numberOfValidHits() < (int)minTotalHits_ ||
track->hitPattern().numberOfValidPixelHits() < (int)minPixelHits_)
continue;
// check the Delta R between jet axis and track
// (Delta_R^2 = Delta_Eta^2 + Delta_Phi^2)
double deltaR = ROOT::Math::VectorUtil::DeltaR(
jet->momentum(), track->momentum());
plots_[ALL_JETS].allDeltaR->Fill(deltaR);
plots_[flavour].allDeltaR->Fill(deltaR);
// only look at tracks in jet cone
if (deltaR > maxDeltaR_)
continue;
// What follows here is an approximation!
//
// The dxy() method of the tracks does a linear
// extrapolation from the track reference position
// given as the closest point to the beam spot
// with respect to the given vertex.
// Since we are using primary vertices, this
// approximation works well
//
// In order to get better results, the
// "TransientTrack" and specialised methods have
// to be used.
// Or look at the "impactParameterTagInfos",
// which contains the precomputed information
// from the official b-tagging algorithms
//
// see ->tagInfoTrackIP() method
double ipError = track->dxyError();
double ipValue = std::abs(track->dxy(pv));
// in order to compute the sign, we check if
// the point of closest approach to the vertex
// is in front or behind the vertex.
// Again, we a linear approximation
//
// dot product between reference point and jet axis
math::XYZVector closestPoint = track->referencePoint() - beamSpot->position();
// only interested in transverse component, z -> 0
closestPoint.SetZ(0.);
double sign = closestPoint.Dot(jet->momentum());
if (sign < 0)
ipValue = -ipValue;
ipValErr.push_back(Measurement1D(ipValue, ipError));
}
// now order all tracks by significance (highest first)
std::sort(ipValErr.begin(), ipValErr.end(), significanceHigher);
plots_[ALL_JETS].nTracks->Fill(ipValErr.size());
plots_[flavour].nTracks->Fill(ipValErr.size());
// plot all tracks
for(std::vector<Measurement1D>::const_iterator iter = ipValErr.begin();
iter != ipValErr.end(); ++iter) {
plots_[ALL_JETS].allIP->Fill(iter->value());
plots_[flavour].allIP->Fill(iter->value());
plots_[ALL_JETS].allIPErr->Fill(iter->error());
plots_[flavour].allIPErr->Fill(iter->error());
// significance (is really just value / error)
plots_[ALL_JETS].allIPSig->Fill(iter->significance());
plots_[flavour].allIPSig->Fill(iter->significance());
}
// check if we have enough tracks to fulfill the
// n-th track requirement
if (ipValErr.size() < nThTrack_)
continue;
// pick the n-th highest track
const Measurement1D *trk = &ipValErr[nThTrack_ - 1];
plots_[ALL_JETS].trackIP->Fill(trk->value());
plots_[flavour].trackIP->Fill(trk->value());
plots_[ALL_JETS].trackIPErr->Fill(trk->error());
plots_[flavour].trackIPErr->Fill(trk->error());
plots_[ALL_JETS].trackIPSig->Fill(trk->significance());
plots_[flavour].trackIPSig->Fill(trk->significance());
// here we define a "negative tagger", i.e. we take
// the track with the n-lowest signed IP
// (i.e. preferrably select tracks that appear to become
// from "behind" the primary vertex, supposedly mismeasured
// tracks really coming from the primary vertex, and
// the contamination of displaced tracks should be small)
trk = &ipValErr[ipValErr.size() - nThTrack_];
plots_[ALL_JETS].negativeIP->Fill(trk->value());
plots_[flavour].negativeIP->Fill(trk->value());
plots_[ALL_JETS].negativeIPErr->Fill(trk->error());
plots_[flavour].negativeIPErr->Fill(trk->error());
plots_[ALL_JETS].negativeIPSig->Fill(trk->significance());
plots_[flavour].negativeIPSig->Fill(trk->significance());
}
}
| void PatBJetTrackAnalyzer::beginJob | ( | void | ) | [virtual] |
Reimplemented from edm::EDAnalyzer.
Definition at line 98 of file PatBJetTrackAnalyzer.cc.
References ALL_JETS, PatBJetTrackAnalyzer::Plots::allDeltaR, PatBJetTrackAnalyzer::Plots::allIP, PatBJetTrackAnalyzer::Plots::allIPErr, PatBJetTrackAnalyzer::Plots::allIPSig, B_JETS, C_JETS, reco::flavour(), flavours_, i, N_JET_TYPES, AlCaRecoCosmics_cfg::name, PatBJetTrackAnalyzer::Plots::negativeIP, PatBJetTrackAnalyzer::Plots::negativeIPErr, PatBJetTrackAnalyzer::Plots::negativeIPSig, PatBJetTrackAnalyzer::Plots::nTracks, plots_, PatBJetTrackAnalyzer::Plots::trackIP, PatBJetTrackAnalyzer::Plots::trackIPErr, PatBJetTrackAnalyzer::Plots::trackIPSig, and UDSG_JETS.
{
// retrieve handle to auxiliary service
// used for storing histograms into ROOT file
edm::Service<TFileService> fs;
flavours_ = fs->make<TH1F>("flavours", "jet flavours", 5, 0, 5);
// book histograms for all jet flavours
for(unsigned int i = 0; i < N_JET_TYPES; i++) {
Plots &plots = plots_[i];
const char *flavour, *name;
switch((Flavour)i) {
case ALL_JETS:
flavour = "all jets";
name = "all";
break;
case UDSG_JETS:
flavour = "light flavour jets";
name = "udsg";
break;
case C_JETS:
flavour = "charm jets";
name = "c";
break;
case B_JETS:
flavour = "bottom jets";
name = "b";
break;
default:
flavour = "unidentified jets";
name = "ni";
break;
}
plots.allIP = fs->make<TH1F>(Form("allIP_%s", name),
Form("signed IP for all tracks in %s", flavour),
100, -0.1, 0.2);
plots.allIPErr = fs->make<TH1F>(Form("allIPErr_%s", name),
Form("error of signed IP for all tracks in %s", flavour),
100, 0, 0.05);
plots.allIPSig = fs->make<TH1F>(Form("allIPSig_%s", name),
Form("signed IP significance for all tracks in %s", flavour),
100, -10, 20);
plots.trackIP = fs->make<TH1F>(Form("trackIP_%s", name),
Form("signed IP for selected positive track in %s", flavour),
100, -0.1, 0.2);
plots.trackIPErr = fs->make<TH1F>(Form("trackIPErr_%s", name),
Form("error of signed IP for selected positive track in %s", flavour),
100, 0, 0.05);
plots.trackIPSig = fs->make<TH1F>(Form("trackIPSig_%s", name),
Form("signed IP significance for selected positive track in %s", flavour),
100, -10, 20);
plots.negativeIP = fs->make<TH1F>(Form("negativeIP_%s", name),
Form("signed IP for selected negative track in %s", flavour),
100, -0.2, 0.1);
plots.negativeIPErr = fs->make<TH1F>(Form("negativeIPErr_%s", name),
Form("error of signed IP for selected negative track in %s", flavour),
100, 0, 0.05);
plots.negativeIPSig = fs->make<TH1F>(Form("negativeIPSig_%s", name),
Form("signed IP significance for selected negative track in %s", flavour),
100, -20, 10);
plots.nTracks = fs->make<TH1F>(Form("nTracks_%s", name),
Form("number of usable tracks in %s", flavour),
30, 0, 30);
plots.allDeltaR = fs->make<TH1F>(Form("allDeltaR_%s", name),
Form("\\DeltaR between track and %s", flavour),
100, 0, 1);
}
}
edm::InputTag PatBJetTrackAnalyzer::beamSpot_ [private] |
Definition at line 44 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
TH1* PatBJetTrackAnalyzer::flavours_ [private] |
Definition at line 68 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze(), and beginJob().
double PatBJetTrackAnalyzer::jetEtaCut_ [private] |
Definition at line 48 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
double PatBJetTrackAnalyzer::jetPtCut_ [private] |
Definition at line 47 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
edm::InputTag PatBJetTrackAnalyzer::jets_ [private] |
Definition at line 42 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
double PatBJetTrackAnalyzer::maxDeltaR_ [private] |
Definition at line 49 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
unsigned int PatBJetTrackAnalyzer::minPixelHits_ [private] |
Definition at line 52 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
double PatBJetTrackAnalyzer::minPt_ [private] |
Definition at line 51 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
unsigned int PatBJetTrackAnalyzer::minTotalHits_ [private] |
Definition at line 53 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
unsigned int PatBJetTrackAnalyzer::nThTrack_ [private] |
Definition at line 55 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
struct PatBJetTrackAnalyzer::Plots PatBJetTrackAnalyzer::plots_[N_JET_TYPES] [private] |
Referenced by analyze(), and beginJob().
Definition at line 45 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
edm::InputTag PatBJetTrackAnalyzer::tracks_ [private] |
Definition at line 43 of file PatBJetTrackAnalyzer.cc.
Referenced by analyze().
1.7.3