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#include "UltraFastSim.h"
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#include "Event.h"
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#include "Analysis.h"
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#include "fastjet/PseudoJet.hh"
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#include "fastjet/JetDefinition.hh"
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#include "fastjet/ClusterSequence.hh"
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using namespace Pythia8;
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using namespace fastjet;
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using namespace std;
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UltraFastSim::UltraFastSim(Rndm* r) : rndmPtr(r),
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jetDefPtr(0),
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cs(0),
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trackerResolution(0.001),
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ecalResolution(0.01),
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ecalConstantTerm(0.01),
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hcalResolution(1.),
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hcalConstantTerm(0.1)
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{
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jetDefPtr = new JetDefinition(antikt_algorithm, 0.5);
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return;
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}
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bool UltraFastSim::run(Event &event) {
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// Clear the previous event
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clear();
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// Select particles of interest for later analysis
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for (int i = 0; i < event.size(); ++i) {
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Particle& particle = event[i];
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// Select generated b quarks in detector acceptance
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if(abs(particle.id()) == 5 && particle.pT() > 10. && abs(particle.eta()) < 2.5) {
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selectedBQuarks.push_back(PseudoJet(particle.px(), particle.py(), particle.pz(), particle.e()));
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}
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// Select generated taus in detector acceptance
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if(abs(particle.id()) == 15 && particle.pT() > 10. && abs(particle.eta()) < 2.5) {
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selectedTaus.push_back(PseudoJet(particle.px(), particle.py(), particle.pz(), particle.e()));
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}
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// Consider only particles with good status
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if(particle.status() > 0) {
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// Consider only visible particles
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if(particle.isVisible()) {
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// Ignore soft particles and those outside the detector
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if(particle.pT() > 1.0 && abs(particle.eta()) < 5.0) {
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// Select electrons within detector acceptance
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if(abs(particle.id()) == 11 && particle.pT() > 10. && abs(particle.eta()) < 2.5) {
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selectedElectrons.push_back(PseudoJet(particle.px(), particle.py(), particle.pz(), particle.e()));
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}
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// Select muons within detector acceptance
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if(abs(particle.id()) == 13 && particle.pT() > 10. && abs(particle.eta()) < 2.5) {
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selectedMuons.push_back(PseudoJet(particle.px(), particle.py(), particle.pz(), particle.e()));
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}
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// Select other charged tracks and smear them
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// Select photons and smear them
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// Select other neutral particles and smear them
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// Select for making jets using fastjet
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selectedParticles.push_back(PseudoJet(particle.px(), particle.py(), particle.pz(), particle.e()));
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}
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}
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}
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}
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makeTaus();
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makeJets();
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makeBJets();
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cout << "Number of Particles = " << selectedParticles.size() << endl;
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cout << "Number of Gen Elecs = " << selectedElectrons.size() << endl;
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cout << "Number of Gen Muons = " << selectedMuons.size() << endl;
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cout << "Number of Gen Taus = " << selectedTaus.size() << endl;
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cout << "Number of b Quarks = " << selectedBQuarks.size() << endl;
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cout << "Number of Jets = " << sortedJets.size() << endl;
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cout << "Number of bJets = " << bJets.size() << endl;
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cout << "Number of taus = " << taus.size() << endl;
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cout << endl;
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return true;
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}
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void UltraFastSim::clear() {
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delete cs;
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selectedParticles.clear();
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selectedElectrons.clear();
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selectedMuons.clear();
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selectedTaus.clear();
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selectedBQuarks.clear();
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jets.clear();
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sortedJets.clear();
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bJets.clear();
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taus.clear();
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}
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void UltraFastSim::makeJets() {
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cs = new ClusterSequence(selectedParticles, *jetDefPtr);
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double ptmin = 15.0;
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jets = cs->inclusive_jets(ptmin);
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sortedJets = sorted_by_pt(jets);
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}
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void UltraFastSim::makeBJets() {
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for (unsigned int i = 0; i < sortedJets.size(); i++) {
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if(abs(sortedJets[i].rap()) < 2.5) {
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for(unsigned int j = 0; j < selectedBQuarks.size(); j++) {
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float dRap = fabs(sortedJets[i].rap() - selectedBQuarks[j].rap());
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float dPhi = fabs(sortedJets[i].phi() - selectedBQuarks[j].phi());
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float dR = sqrt(dRap*dRap + dPhi*dPhi);
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if(dR < 0.3) {
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bJets.push_back(sortedJets[i]);
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break;
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}
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}
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}
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}
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}
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void UltraFastSim::makeTaus() {
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for (unsigned int i = 0; i < selectedParticles.size(); i++) {
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// Make sure that there is high PT track seed
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if(selectedParticles[i].Et() > 5. && abs(selectedParticles[i].rap()) < 2.5) {
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int nObjectsInInnerCone = 0;
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float isolationEnergy = 0.;
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PseudoJet tau(selectedParticles[i]);
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for(unsigned int j = 0; j < selectedParticles.size(); j++) {
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if(i != j) {
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if(selectedParticles[i].Et() >= selectedParticles[j].Et()) {
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float dRap = fabs(selectedParticles[i].rap() - selectedParticles[j].rap());
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float dPhi = fabs(selectedParticles[i].phi() - selectedParticles[j].phi());
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float dR = sqrt(dRap*dRap + dPhi*dPhi);
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// Make sure that there are no more than five objects in the inner 0.3 cone
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if(dR < 0.3) {
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nObjectsInInnerCone++;
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if(nObjectsInInnerCone > 5) break;
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tau += selectedParticles[j];
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}
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else if(dR < 0.5) {
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isolationEnergy += selectedParticles[j].e();
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}
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}
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else {
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break;
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}
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}
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}
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// Make sure that there is no more than 5% energy in the 0.5
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if(tau.Et() > 15. && (isolationEnergy / tau.e()) < 0.05) {
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taus.push_back(tau);
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}
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}
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}
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}
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