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HLTmumutktkFilter.cc
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HLTmumutktkFilter.cc
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#include <algorithm>
#include <cmath>
#include <vector>
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"
#include "DataFormats/HLTReco/interface/TriggerFilterObjectWithRefs.h"
#include "DataFormats/RecoCandidate/interface/RecoCandidate.h"
#include "DataFormats/RecoCandidate/interface/RecoChargedCandidate.h"
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "RecoVertex/KalmanVertexFit/interface/KalmanVertexFitter.h"
#include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"
#include "TrackingTools/TransientTrack/interface/TransientTrackBuilder.h"
#include "TrackingTools/Records/interface/TransientTrackRecord.h"
#include "HLTrigger/btau/src/HLTmumutktkFilter.h"
#include "TMath.h"
using namespace edm;
using namespace reco;
using namespace std;
using namespace trigger;
// ----------------------------------------------------------------------
HLTmumutktkFilter::HLTmumutktkFilter(const edm::ParameterSet& iConfig) : HLTFilter(iConfig),
muCandTag_ (iConfig.getParameter<edm::InputTag>("MuonTag")),
muCandToken_(consumes<reco::RecoChargedCandidateCollection>(muCandTag_)),
trkCandTag_ (iConfig.getParameter<edm::InputTag>("TrackTag")),
trkCandToken_(consumes<reco::RecoChargedCandidateCollection>(trkCandTag_)),
MuMuTkVertexTag_ (iConfig.getParameter<edm::InputTag>("MuMuTkVertexTag")),
MuMuTkVertexToken_(consumes<reco::VertexCollection>(MuMuTkVertexTag_)),
beamSpotTag_ (iConfig.getParameter<edm::InputTag> ("BeamSpotTag")),
beamSpotToken_(consumes<reco::BeamSpot>(beamSpotTag_)),
maxEta_(iConfig.getParameter<double>("MaxEta")),
minPt_(iConfig.getParameter<double>("MinPt")),
maxNormalisedChi2_(iConfig.getParameter<double>("MaxNormalisedChi2")),
minVtxProbability_(iConfig.getParameter<double>("MinVtxProbability")),
minLxySignificance_(iConfig.getParameter<double>("MinLxySignificance")),
minCosinePointingAngle_(iConfig.getParameter<double>("MinCosinePointingAngle"))
{
}
// ----------------------------------------------------------------------
HLTmumutktkFilter::~HLTmumutktkFilter() = default;
void
HLTmumutktkFilter::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
edm::ParameterSetDescription desc;
makeHLTFilterDescription(desc);
desc.add<double>("MaxEta",2.5);
desc.add<double>("MinPt" ,0.0);
desc.add<double>("MaxNormalisedChi2" ,10.0);
desc.add<double>("MinVtxProbability" , 0.0);
desc.add<double>("MinLxySignificance",3.0);
desc.add<double>("MinCosinePointingAngle",0.9);
desc.add<edm::InputTag>("MuonTag",edm::InputTag("hltL3MuonCandidates"));
desc.add<edm::InputTag>("TrackTag",edm::InputTag("hltMumukAllConeTracks"));
desc.add<edm::InputTag>("MuMuTkVertexTag",edm::InputTag("hltDisplacedmumuVtxProducerDoubleMu4Jpsi"));
desc.add<edm::InputTag>("BeamSpotTag",edm::InputTag("hltOnineBeamSpot"));
descriptions.add("HLTmumutktkFilter",desc);
}
// ----------------------------------------------------------------------
bool HLTmumutktkFilter::hltFilter(edm::Event& iEvent, const edm::EventSetup& iSetup, trigger::TriggerFilterObjectWithRefs & filterproduct) const {
//get the beamspot position
edm::Handle<reco::BeamSpot> recoBeamSpotHandle;
iEvent.getByToken(beamSpotToken_,recoBeamSpotHandle);
const reco::BeamSpot& vertexBeamSpot = *recoBeamSpotHandle;
// get vertices
reco::VertexCollection displacedVertexColl;
edm::Handle<reco::VertexCollection> displacedVertexCollHandle;
bool foundVertexColl = iEvent.getByToken(MuMuTkVertexToken_, displacedVertexCollHandle);
if(foundVertexColl) displacedVertexColl = *displacedVertexCollHandle;
// get muon collection
Handle<RecoChargedCandidateCollection> mucands;
iEvent.getByToken(muCandToken_,mucands);
// get track candidates around displaced muons
Handle<RecoChargedCandidateCollection> trkcands;
iEvent.getByToken(trkCandToken_,trkcands);
// Ref to Candidate object to be recorded in filter object
RecoChargedCandidateRef refMu1 ;
RecoChargedCandidateRef refMu2 ;
RecoChargedCandidateRef refTrk1;
RecoChargedCandidateRef refTrk2;
if (saveTags()) {
filterproduct.addCollectionTag(muCandTag_);
filterproduct.addCollectionTag(trkCandTag_);
}
bool triggered = false;
// loop over vertex collection
reco::VertexCollection::iterator it;
for(it = displacedVertexColl.begin(); it!= displacedVertexColl.end(); it++){
reco::Vertex displacedVertex = *it;
// check if the vertex actually consists of exactly two muon + 1 track, throw exception if not
if(displacedVertex.tracksSize() != 4) throw cms::Exception("BadLogic") << "HLTmumutktkFilter: ERROR: the Jpsi+trk vertex must have "
<< "exactly two muons + 2 trk by definition. It now has n trakcs = "
<< displacedVertex.tracksSize() << std::endl;
float normChi2 = displacedVertex.normalizedChi2();
if (normChi2 > maxNormalisedChi2_) continue;
double vtxProb = 0.0;
if ((displacedVertex.chi2()>=0.0) && (displacedVertex.ndof()>0) )
vtxProb = TMath::Prob(displacedVertex.chi2(), displacedVertex.ndof() );
if (vtxProb < minVtxProbability_) continue;
// get the four tracks from the vertex
std::vector <reco::TrackRef> vertexTrksRefVec;
auto trackIt = displacedVertex.tracks_begin();
for (trackIt = displacedVertex.tracks_begin(); trackIt != displacedVertex.tracks_end(); trackIt++){
vertexTrksRefVec.push_back((*trackIt).castTo<reco::TrackRef>());
}
// first find the tracks in the input muon/track collection
std::vector<reco::RecoChargedCandidateCollection::const_iterator> mucandVec;
std::vector<reco::RecoChargedCandidateCollection::const_iterator> trkcandVec;
for (auto cand=mucands->begin(); cand!=mucands->end(); cand++) {
reco::TrackRef tkRef = cand->get<reco::TrackRef>();
for (auto & iVec : vertexTrksRefVec){
if (tkRef == iVec) {mucandVec.push_back(cand); break;}
}
}
if(mucandVec.size() < 2) throw cms::Exception("BadLogic") << "HLTmumutktkFilterr: ERROR: the vertex must have "
<< " at least two muons by definition." << std::endl;
for (auto cand=trkcands->begin(); cand!=trkcands->end(); cand++) {
reco::TrackRef tkRef = cand->get<reco::TrackRef>();
for (auto & iVec : vertexTrksRefVec){
if (tkRef == iVec) {trkcandVec.push_back(cand); break;}
}
}
if(trkcandVec.size() < 2 ) throw cms::Exception("BadLogic") << "HLTmumutktkFilterr: ERROR: the vertex must have "
<< " at least two tracks by definition." << std::endl;
// calculate four-track transverse momentum
math::XYZVector pperp(mucandVec.at(0)->px() + mucandVec.at(1)->px() + trkcandVec.at(0)->px() + trkcandVec.at(1)->px(),
mucandVec.at(0)->py() + mucandVec.at(1)->py() + trkcandVec.at(0)->px() + trkcandVec.at(1)->py(),
0.);
// get vertex position and error to calculate the decay length significance
const reco::Vertex::Point& vpoint=displacedVertex.position();
reco::Vertex::Error verr = displacedVertex.error();
GlobalPoint secondaryVertex (vpoint.x(), vpoint.y(), vpoint.z());
GlobalError err(verr.At(0,0), verr.At(1,0), verr.At(1,1), verr.At(2,0), verr.At(2,1), verr.At(2,2) );
GlobalPoint displacementFromBeamspot( -1*((vertexBeamSpot.x0() - secondaryVertex.x()) + (secondaryVertex.z() - vertexBeamSpot.z0()) * vertexBeamSpot.dxdz()),
-1*((vertexBeamSpot.y0() - secondaryVertex.y()) + (secondaryVertex.z() - vertexBeamSpot.z0()) * vertexBeamSpot.dydz()),
0 );
float lxy = displacementFromBeamspot.perp();
float lxyerr = sqrt(err.rerr(displacementFromBeamspot));
float lxysign = 0;
if (lxyerr != 0) lxysign = lxy/lxyerr;
//calculate the angle between the decay length and the four-track momentum
Vertex::Point vperp(displacementFromBeamspot.x(),displacementFromBeamspot.y(),0.);
float cosAlpha = vperp.Dot(pperp)/(vperp.Rho()*pperp.Rho());
if (pperp.Rho() < minPt_ ) continue;
if (lxysign < minLxySignificance_ ) continue;
if (cosAlpha < minCosinePointingAngle_) continue;
triggered = true;
refMu1=RecoChargedCandidateRef( Ref<RecoChargedCandidateCollection> (mucands,distance(mucands->begin(), mucandVec.at(0))));
filterproduct.addObject(TriggerMuon,refMu1);
refMu2=RecoChargedCandidateRef( Ref<RecoChargedCandidateCollection> (mucands,distance(mucands->begin(), mucandVec.at(1))));
filterproduct.addObject(TriggerMuon,refMu2);
refTrk1=RecoChargedCandidateRef( Ref<RecoChargedCandidateCollection> (trkcands,distance(trkcands->begin(),trkcandVec.at(0))));
filterproduct.addObject(TriggerTrack,refTrk1);
refTrk2=RecoChargedCandidateRef( Ref<RecoChargedCandidateCollection> (trkcands,distance(trkcands->begin(),trkcandVec.at(1))));
filterproduct.addObject(TriggerTrack,refTrk2);
}//end loop vertices
LogDebug("HLTDisplacedMumuTrkFilter") << " >>>>> Result of HLTDisplacedMuMuTrkFilter is "<< triggered;
return triggered;
}
bool HLTmumutktkFilter::triggerdByPreviousLevel(const reco::RecoChargedCandidateRef & candref, const std::vector<reco::RecoChargedCandidateRef>& vcands){
unsigned int i=0;
unsigned int i_max=vcands.size();
for (;i!=i_max;++i){
if (candref == vcands[i]) return true;
}
return false;
}