#include <TTbarSpinCorrHepMCAnalyzer.h>

Inheritance diagram for TTbarSpinCorrHepMCAnalyzer:

Public Member Functions
	TTbarSpinCorrHepMCAnalyzer (const edm::ParameterSet &)
	~TTbarSpinCorrHepMCAnalyzer ()
Private Member Functions
virtual void	analyze (const edm::Event &, const edm::EventSetup &)
virtual void	beginJob ()
virtual void	beginLuminosityBlock (edm::LuminosityBlock const &, edm::EventSetup const &)
virtual void	beginRun (edm::Run const &, edm::EventSetup const &)
virtual void	endJob ()
virtual void	endLuminosityBlock (edm::LuminosityBlock const &, edm::EventSetup const &)
virtual void	endRun (edm::Run const &, edm::EventSetup const &)
Private Attributes
MonitorElement *	_h_asym
MonitorElement *	_h_deltaPhi
MonitorElement *	_h_llpairM
MonitorElement *	_h_llpairPt
DQMStore *	dbe
edm::InputTag	genEventInfoProductTag_
edm::InputTag	genParticlesTag_
MonitorElement *	nEvt
double	weight

Detailed Description

Description: [one line class summary]

Implementation: [Notes on implementation]

Definition at line 56 of file TTbarSpinCorrHepMCAnalyzer.h.

Constructor & Destructor Documentation

TTbarSpinCorrHepMCAnalyzer::TTbarSpinCorrHepMCAnalyzer ( const edm::ParameterSet & iConfig ) [explicit]

Definition at line 6 of file TTbarSpinCorrHepMCAnalyzer.cc.

References dbe, and cppFunctionSkipper::operator.

                                                                                     :
  genEventInfoProductTag_(iConfig.getParameter<edm::InputTag>("genEventInfoProductTag")),
  genParticlesTag_(iConfig.getParameter<edm::InputTag>("genParticlesTag"))
{
  dbe = 0;
  dbe = edm::Service<DQMStore>().operator->();
}

TTbarSpinCorrHepMCAnalyzer::~TTbarSpinCorrHepMCAnalyzer ( )

Definition at line 15 of file TTbarSpinCorrHepMCAnalyzer.cc.

{
 
  // do anything here that needs to be done at desctruction time
  // (e.g. close files, deallocate resources etc.)

}

Member Function Documentation

void TTbarSpinCorrHepMCAnalyzer::analyze	(	const edm::Event &	iEvent,
		const edm::EventSetup &	iSetup
	)		`[private, virtual]`

Implements edm::EDAnalyzer.

Definition at line 30 of file TTbarSpinCorrHepMCAnalyzer.cc.

References _h_asym, _h_deltaPhi, _h_llpairM, _h_llpairPt, SiPixelRawToDigiRegional_cfi::deltaPhi, MonitorElement::Fill(), genEventInfoProductTag_, genParticleCandidates2GenParticles_cfi::genParticles, genParticlesTag_, edm::Event::getByLabel(), i, nEvt, AlCaHLTBitMon_ParallelJobs::p, reco::LeafCandidate::p4(), reco::LeafCandidate::pdgId(), Phi_mpi_pi(), reco::LeafCandidate::status(), and weight.

{
  using namespace edm;

  // --- the MC weights ---
  Handle<GenEventInfoProduct> evt_info;
  iEvent.getByLabel(genEventInfoProductTag_, evt_info);
  if (evt_info.failedToGet())
    return;

  weight = evt_info->weight() ;
  
  // --- get genParticles ---
  Handle<reco::GenParticleCollection> genParticles;
  iEvent.getByLabel(genParticlesTag_, genParticles);   

  const reco::GenParticle * _lepton   (0) ;
  const reco::GenParticle * _leptonBar(0) ;

  bool hasTop(false), hasTopbar(false);
  for(size_t i = 0; i < genParticles->size(); ++ i) {
    const reco::GenParticle & p = (*genParticles)[i];
    if(p.pdgId() == 6) hasTop=true;
    if(p.pdgId() == -6) hasTopbar=true;
  }

  if(hasTop && hasTopbar){
    // --- get status 3 leptons
    for(size_t i = 0; i < genParticles->size(); ++ i) {
      const reco::GenParticle & p = (*genParticles)[i];
      if ( (p.pdgId() ==  11 ||
            p.pdgId() ==  13 ||
            p.pdgId() ==  15) && p.status() == 3) { _lepton    = &p ; }
      if ( (p.pdgId() == -11 ||
            p.pdgId() == -13 ||
            p.pdgId() == -15) && p.status() == 3) { _leptonBar = &p ; }
      
      if (_lepton && _leptonBar) break;
    }
    
    if (_lepton && _leptonBar) {
      
      math::XYZTLorentzVector lepton    = _lepton   ->p4() ;
      math::XYZTLorentzVector leptonBar = _leptonBar->p4() ;
      
      double deltaPhi = fabs(TVector2::Phi_mpi_pi(lepton.phi() - leptonBar.phi())) ;
      _h_deltaPhi->Fill(deltaPhi, weight) ;
      
      double asym = ( deltaPhi > CLHEP::halfpi ) ? 0.5 : -0.5 ;
      _h_asym->Fill(asym, weight) ;
      
      math::XYZTLorentzVector llpair    = lepton + leptonBar ;
      
      double llpairPt = llpair.pt() ;
      _h_llpairPt->Fill(llpairPt, weight) ;
      
      double llpairM  = llpair.M() ;
    _h_llpairM ->Fill(llpairM , weight) ;
    
    }
    nEvt->Fill(0.5 , weight) ;
  }
}

void TTbarSpinCorrHepMCAnalyzer::beginJob ( void ) [private, virtual]

Setting the DQM top directories

Reimplemented from edm::EDAnalyzer.

Definition at line 97 of file TTbarSpinCorrHepMCAnalyzer.cc.

References _h_asym, _h_deltaPhi, _h_llpairM, _h_llpairPt, DQMStore::book1D(), dbe, dir, nEvt, MonitorElement::setAxisTitle(), and DQMStore::setCurrentFolder().

{
  if(dbe){
    TString dir="Generator/";
    dir+="TTbarSpinCorr";
    dbe->setCurrentFolder(dir.Data());

    // Number of analyzed events
    nEvt = dbe->book1D("nEvt", "n analyzed Events", 1, 0., 1.);
    
    _h_asym = dbe->book1D("TTbar_asym","Asymmetr", 2, -1., 1.);
    _h_asym->setAxisTitle("Asymmetry");

    _h_deltaPhi = dbe->book1D("TTbar_deltaPhi","#Delta#phi(ll)", 320, 0, 3.2);
    _h_deltaPhi->setAxisTitle("#Delta#phi(ll)");
    
    _h_llpairPt = dbe->book1D("TTbar_llpairPt","Lepton pair transverse momentum", 1000, 0, 1000);
    _h_llpairPt->setAxisTitle("p_{T}(ll)");
    
    _h_llpairM  = dbe->book1D("TTbar_llpairM","Lepton pair invariant mass", 1000, 0, 1000);
    _h_llpairM->setAxisTitle("M(ll)");

  }
}