bool PseudoTopAnalyser::passesEventSelection( const MCParticlePointer pseudoLepton, const ParticlePointer pseudoNeutrino, const JetCollection pseudoJets, const MCParticleCollection pseudoBs, const ParticleCollection allPseudoLeptons, const ParticlePointer pseudoMET ) {

	// Event selection taken from here : https://twiki.cern.ch/twiki/bin/view/LHCPhysics/ParticleLevelTopDefinitions
	unsigned int numberGoodLeptons = 0;
	unsigned int numberVetoLeptons = 0;
	ParticlePointer leadingLepton;
	for ( unsigned int leptonIndex = 0; leptonIndex < allPseudoLeptons.size(); ++ leptonIndex ) {
		const ParticlePointer lepton = allPseudoLeptons.at(leptonIndex);

		// Check if this is a good signal type lepton
		if ( lepton->pt() > minLeptonPt_ && fabs(lepton->eta()) < maxLeptonAbsEta_ ) {
			++numberGoodLeptons;
			if ( leadingLepton == 0 ) leadingLepton = lepton;
		}
		
		// Check if this is a veto lepton
		if ( lepton->pt() > minVetoLeptonPt_ && fabs(lepton->eta()) < maxVetoLeptonAbsEta_ ) {
			++numberVetoLeptons;
		}
	}

	// Neutrino pt sum
	bool passesNeutrinoSumPt = false;
	if ( pseudoMET != 0 ) {
		if ( pseudoMET->pt() > minNeutrinoSumPt_ ) passesNeutrinoSumPt = true;
	}

	// W MT
	bool passesWMT = false;
	if ( leadingLepton != 0 && pseudoMET != 0 ) {
		double genMT = sqrt( 2 * leadingLepton->pt() * pseudoMET->pt() * ( 1 - cos(leadingLepton->phi() - pseudoMET->phi() ) ) );
		if (genMT > minWMt_) passesWMT = true;
	}


	// Jets
	unsigned int numberGoodJets = 0;
	unsigned int numberGoodBJets = 0;

	for ( unsigned int jetIndex = 0; jetIndex < pseudoJets.size(); ++ jetIndex ) {
		const JetPointer jet = pseudoJets.at(jetIndex);

		// Check if this is a good jet
		if ( jet->pt() > minJetPt_ && fabs(jet->eta()) < maxJetAbsEta_ ) {
			++numberGoodJets;

			// Check if this is also a good b jet
			if ( fabs( jet->partonFlavour() ) == 5 ) {
				++numberGoodBJets;
			}
		}
	}
	
	if ( numberGoodLeptons == 1 && numberVetoLeptons <= 1 && passesNeutrinoSumPt && passesWMT && numberGoodJets >= minNJets_ && numberGoodBJets >= minNBJets_ ) {
		return true;
	}
	else return false;

}
Example #2
0
unsigned short Particle::getClosest(const ParticleCollection& particles) const {
	unsigned short idOfClosest = 999;
	double closestDR = 999.;
	for (unsigned short index = 0; index < particles.size(); ++index) {
		double DR = deltaR(particles.at(index));
		if (DR < closestDR) {
			closestDR = DR;
			idOfClosest = index;
		}
	}
	return idOfClosest;
}
void PseudoTopAnalyser::analyse(const EventPtr event) {
	weight_ = event->weight();

	treeMan_->setCurrentFolder(histogramFolder_);

	// Store gen selection criteria
	treeMan_->Fill("isSemiLeptonicElectron", event->isSemiLeptonicElectron());
	treeMan_->Fill("isSemiLeptonicMuon", event->isSemiLeptonicMuon());


	const PseudoTopParticlesPointer pseudoTopParticles = event->PseudoTopParticles();
	const MCParticleCollection pseudoTops = pseudoTopParticles->getPseudoTops();
	const MCParticlePointer pseudoLeptonicW = pseudoTopParticles->getPseudoLeptonicW();
	const MCParticlePointer pseudoLepton = pseudoTopParticles->getPseudoLepton();
	const ParticleCollection allPseudoLeptons = pseudoTopParticles->getAllPseudoLeptons();
	const MCParticleCollection pseudoBs = pseudoTopParticles->getPseudoBs();
	const ParticlePointer pseudoMET = pseudoTopParticles->getPseudoMET();
	const ParticlePointer pseudoNeutrino = pseudoTopParticles->getPseudoNeutrino();
	const JetCollection pseudoJets = pseudoTopParticles->getPseudoJets();

	ParticleCollection pseudoTopsForTTbar;

	// // Only consider events with two pseudo tops
	// if ( pseudoTops.size() != 2 ) return;

	// // Also only consider events that are semi leptonic at the pseudo top level
	// if ( !pseudoTopParticles->isSemiLeptonic() ) return;

	// Check if event passes event selection (at pseudo top level)
	if ( passesEventSelection( pseudoLepton, pseudoNeutrino, pseudoJets, pseudoBs, allPseudoLeptons, pseudoMET ) ) {
		treeMan_->Fill("passesGenEventSelection",1);
	}
	else {
		treeMan_->Fill("passesGenEventSelection",0);
	}

	//
	// TOP VARIABLES
	// Top reco at particle level performed
	//

	// Store info on top
	for ( unsigned int ptIndex = 0; ptIndex < pseudoTops.size(); ++ ptIndex ) {
		// cout << "Getting pseudo top number : " << ptIndex << endl;
		const ParticlePointer pseudoTop = pseudoTops[ptIndex];
		pseudoTopsForTTbar.push_back( pseudoTop );
		treeMan_->Fill("pseudoTop_pT", pseudoTop->pt() );
		treeMan_->Fill("pseudoTop_y", pseudoTop->rapidity() );
	}

	if( pseudoTopsForTTbar.size() == 2 ) {
		// Store info on ttbar
		ParticlePointer pseudoTTbar( new Particle( *pseudoTopsForTTbar[0] + *pseudoTopsForTTbar[1] ) );
		treeMan_->Fill("pseudoTTbar_pT", pseudoTTbar->pt() );
		treeMan_->Fill("pseudoTTbar_y", pseudoTTbar->rapidity() );
		treeMan_->Fill("pseudoTTbar_m", pseudoTTbar->mass() );
	}


	// Store info on Bs
	if ( pseudoBs.size() == 2 ) {
		unsigned int leadingPsuedoBIndex = 0;
		if ( pseudoBs[1]->pt() > pseudoBs[0]->pt() ) {
			leadingPsuedoBIndex = 1;
		}
		unsigned int subleadingPsuedoBIndex = ( leadingPsuedoBIndex == 0 ) ? 1 : 0;
		treeMan_->Fill("pseudoB_pT", pseudoBs[leadingPsuedoBIndex]->pt() );
		treeMan_->Fill("pseudoB_eta", pseudoBs[leadingPsuedoBIndex]->eta() );
		treeMan_->Fill("pseudoB_pT", pseudoBs[subleadingPsuedoBIndex]->pt() );
		treeMan_->Fill("pseudoB_eta", pseudoBs[subleadingPsuedoBIndex]->eta() );
		// for ( unsigned int pbIndex = 0; pbIndex < pseudoBs.size(); ++pbIndex ) {
		// 	treeMan_->Fill("pseudoB_pT", pseudoBs[pbIndex]->pt() );
		// 	treeMan_->Fill("pseudoB_eta", pseudoBs[pbIndex]->eta() );
		// }
	}


	//
	// GLOBAL VARIABLES
	// No top reco at particle level
	//

	if ( allPseudoLeptons.size() > 0 ) {
		// Store info on lepton
		treeMan_->Fill("pseudoLepton_pT", allPseudoLeptons[0]->pt() );
		treeMan_->Fill("pseudoLepton_eta", allPseudoLeptons[0]->eta() );		
	}

	// Store pseudo MET
	if ( pseudoMET != 0 ) {
		treeMan_->Fill("pseudoMET", pseudoMET->et() );
		METAlgorithm::value metType = (METAlgorithm::value) 0;
		const METPointer met(event->MET(metType));
		if ( pseudoMET->et() <= 0 && met->et() > 0 ) {
		}
		treeMan_->Fill("pseudoMET_mass", pseudoMET->mass() );
	}


	// Store pseudo HT
	treeMan_->Fill("pseudoHT", event->HT( pseudoJets ) );

	// Store pseudo ST
	if ( allPseudoLeptons.size() > 0 ) {
		treeMan_->Fill("pseudoST", event->ST( pseudoJets, allPseudoLeptons[0], METPointer( new MET( pseudoMET->px(), pseudoMET->py() )) ) );
	}

	// Store pseudo MT and WPT
	// These are from the W reconstructed from the pseudo particles
	// i.e. use the neutrino assocaited with the W rather than the more "global" MET
	if ( pseudoLeptonicW != 0 ) {
		treeMan_->Fill("pseudoWPT_reco", pseudoLeptonicW->pt() );
	}

	if ( pseudoMET != 0 && allPseudoLeptons.size() > 0 ) {
		double WPT = event->WPT( allPseudoLeptons[0], METPointer( new MET( pseudoMET->px(), pseudoMET->py() ))  );
		treeMan_->Fill("pseudoWPT", WPT );

		double MT = event->MT( allPseudoLeptons[0], METPointer( new MET( pseudoMET->px(), pseudoMET->py() )) );
		treeMan_->Fill("pseudoMT", MT );
	}

}