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Classes | |
| struct | Plots |
Public Member Functions | |
| virtual void | analyze (const edm::Event &event, const edm::EventSetup &es) |
| virtual void | beginJob () |
| PatBJetVertexAnalyzer (const edm::ParameterSet ¶ms) | |
| constructor and destructor | |
| ~PatBJetVertexAnalyzer () | |
Private Types | |
| enum | Flavour { ALL_JETS = 0, UDSG_JETS, C_JETS, B_JETS, NONID_JETS, N_JET_TYPES } |
Private Attributes | |
| TH1 * | flavours_ |
| double | jetEtaCut_ |
| double | jetPtCut_ |
| edm::InputTag | jets_ |
| double | maxDeltaR_ |
| struct PatBJetVertexAnalyzer::Plots | plots_ [N_JET_TYPES] |
Definition at line 33 of file PatBJetVertexAnalyzer.cc.
enum PatBJetVertexAnalyzer::Flavour [private] |
Definition at line 53 of file PatBJetVertexAnalyzer.cc.
{
ALL_JETS = 0,
UDSG_JETS,
C_JETS,
B_JETS,
NONID_JETS,
N_JET_TYPES
};
| PatBJetVertexAnalyzer::PatBJetVertexAnalyzer | ( | const edm::ParameterSet & | params | ) |
constructor and destructor
Definition at line 72 of file PatBJetVertexAnalyzer.cc.
:
jets_(params.getParameter<edm::InputTag>("jets")),
jetPtCut_(params.getParameter<double>("jetPtCut")),
jetEtaCut_(params.getParameter<double>("jetEtaCut"))
{
}
| PatBJetVertexAnalyzer::~PatBJetVertexAnalyzer | ( | ) |
Definition at line 79 of file PatBJetVertexAnalyzer.cc.
{
}
| void PatBJetVertexAnalyzer::analyze | ( | const edm::Event & | event, |
| const edm::EventSetup & | es | ||
| ) | [virtual] |
Implements edm::EDAnalyzer.
Definition at line 148 of file PatBJetVertexAnalyzer.cc.
References abs, ALL_JETS, B_JETS, C_JETS, PatBJetVertexAnalyzer::Plots::chi2, reco::Vertex::chi2(), deltaR(), PatBJetVertexAnalyzer::Plots::deltaR, dir, PatBJetVertexAnalyzer::Plots::dist, PatBJetVertexAnalyzer::Plots::distErr, PatBJetVertexAnalyzer::Plots::distSig, Measurement1D::error(), reco::flavour(), flavours_, reco::SecondaryVertexTagInfo::flightDirection(), reco::SecondaryVertexTagInfo::flightDistance(), metsig::jet, jetEtaCut_, jetPtCut_, jets_, PatBJetVertexAnalyzer::Plots::mass, NONID_JETS, PatBJetVertexAnalyzer::Plots::nTracks, PatBJetVertexAnalyzer::Plots::nVertices, reco::SecondaryVertexTagInfo::nVertices(), plots_, reco::SecondaryVertexTagInfo::secondaryVertex(), Measurement1D::significance(), reco::Vertex::tracks_begin(), reco::Vertex::tracks_end(), reco::Vertex::tracksSize(), UDSG_JETS, Measurement1D::value(), reco::btau::vertexMass, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().
{
// handle to the jets collection
edm::Handle<pat::JetCollection> jetsHandle;
event.getByLabel(jets_, jetsHandle);
// 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);
// retrieve the "secondary vertex tag infos"
// this is the output of the b-tagging reconstruction code
// and contains secondary vertices in the jets
const reco::SecondaryVertexTagInfo &svTagInfo =
*jet->tagInfoSecondaryVertex();
// count the number of secondary vertices
plots_[ALL_JETS].nVertices->Fill(svTagInfo.nVertices());
plots_[flavour].nVertices->Fill(svTagInfo.nVertices());
// ignore jets without SV from now on
if (svTagInfo.nVertices() < 1)
continue;
// pick the first secondary vertex (the "best" one)
const reco::Vertex &sv = svTagInfo.secondaryVertex(0);
// and plot number of tracks and chi^2
plots_[ALL_JETS].nTracks->Fill(sv.tracksSize());
plots_[flavour].nTracks->Fill(sv.tracksSize());
plots_[ALL_JETS].chi2->Fill(sv.chi2());
plots_[flavour].chi2->Fill(sv.chi2());
// the precomputed transverse distance to the primary vertex
Measurement1D distance = svTagInfo.flightDistance(0, true);
plots_[ALL_JETS].dist->Fill(distance.value());
plots_[flavour].dist->Fill(distance.value());
plots_[ALL_JETS].distErr->Fill(distance.error());
plots_[flavour].distErr->Fill(distance.error());
plots_[ALL_JETS].distSig->Fill(distance.significance());
plots_[flavour].distSig->Fill(distance.significance());
// the precomputed direction with respect to the primary vertex
GlobalVector dir = svTagInfo.flightDirection(0);
// unfortunately CMSSW hsa all kinds of vectors,
// and sometimes we need to convert them *sigh*
math::XYZVector dir2(dir.x(), dir.y(), dir.z());
// compute a few variables that we are plotting
double deltaR = ROOT::Math::VectorUtil::DeltaR(
jet->momentum(), dir2);
plots_[ALL_JETS].deltaR->Fill(deltaR);
plots_[flavour].deltaR->Fill(deltaR);
// compute the invariant mass from a four-vector sum
math::XYZTLorentzVector trackFourVectorSum;
// loop over all tracks in the vertex
for(reco::Vertex::trackRef_iterator track = sv.tracks_begin();
track != sv.tracks_end(); ++track) {
ROOT::Math::LorentzVector<ROOT::Math::PxPyPzM4D<double> > vec;
vec.SetPx((*track)->px());
vec.SetPy((*track)->py());
vec.SetPz((*track)->pz());
vec.SetM(0.13957); // pion mass
trackFourVectorSum += vec;
}
// get the invariant mass: sqrt(E² - px² - py² - pz²)
double vertexMass = trackFourVectorSum.M();
plots_[ALL_JETS].mass->Fill(vertexMass);
plots_[flavour].mass->Fill(vertexMass);
}
}
| void PatBJetVertexAnalyzer::beginJob | ( | void | ) | [virtual] |
Reimplemented from edm::EDAnalyzer.
Definition at line 83 of file PatBJetVertexAnalyzer.cc.
References ALL_JETS, B_JETS, C_JETS, PatBJetVertexAnalyzer::Plots::chi2, PatBJetVertexAnalyzer::Plots::deltaR, PatBJetVertexAnalyzer::Plots::dist, PatBJetVertexAnalyzer::Plots::distErr, PatBJetVertexAnalyzer::Plots::distSig, reco::flavour(), flavours_, i, PatBJetVertexAnalyzer::Plots::mass, N_JET_TYPES, mergeVDriftHistosByStation::name, PatBJetVertexAnalyzer::Plots::nTracks, PatBJetVertexAnalyzer::Plots::nVertices, plots_, 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.nVertices = fs->make<TH1F>(Form("nVertices_%s", name),
Form("number of secondary vertices in %s", flavour),
5, 0, 5);
plots.deltaR = fs->make<TH1F>(Form("deltaR_%s", name),
Form("\\DeltaR between vertex direction and jet direction in %s", flavour),
100, 0, 0.5);
plots.mass = fs->make<TH1F>(Form("mass_%s", name),
Form("vertex mass in %s", flavour),
100, 0, 10);
plots.dist = fs->make<TH1F>(Form("dist_%s", name),
Form("Transverse distance between PV and SV in %s", flavour),
100, 0, 2);
plots.distErr = fs->make<TH1F>(Form("distErr_%s", name),
Form("Transverse distance error between PV and SV in %s", flavour),
100, 0, 0.5);
plots.distSig = fs->make<TH1F>(Form("distSig_%s", name),
Form("Transverse distance significance between PV and SV in %s", flavour),
100, 0, 50);
plots.nTracks = fs->make<TH1F>(Form("nTracks_%s", name),
Form("number of tracks at secondary vertex in %s", flavour),
20, 0, 20);
plots.chi2 = fs->make<TH1F>(Form("chi2_%s", name),
Form("secondary vertex fit \\chi^{2} in %s", flavour),
100, 0, 50);
}
}
TH1* PatBJetVertexAnalyzer::flavours_ [private] |
Definition at line 62 of file PatBJetVertexAnalyzer.cc.
Referenced by analyze(), and beginJob().
double PatBJetVertexAnalyzer::jetEtaCut_ [private] |
Definition at line 48 of file PatBJetVertexAnalyzer.cc.
Referenced by analyze().
double PatBJetVertexAnalyzer::jetPtCut_ [private] |
Definition at line 47 of file PatBJetVertexAnalyzer.cc.
Referenced by analyze().
edm::InputTag PatBJetVertexAnalyzer::jets_ [private] |
Definition at line 45 of file PatBJetVertexAnalyzer.cc.
Referenced by analyze().
double PatBJetVertexAnalyzer::maxDeltaR_ [private] |
Definition at line 49 of file PatBJetVertexAnalyzer.cc.
struct PatBJetVertexAnalyzer::Plots PatBJetVertexAnalyzer::plots_[N_JET_TYPES] [private] |
Referenced by analyze(), and beginJob().
1.7.3