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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 "TParticle.h"
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#include "TLorentzVector.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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#include "UFSDataStore.h"
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#include "UFSDataStore.cc"
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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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Rndm *rndmPtr;
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bool UltraFastSim::run(Event &event, Rndm *r) {
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// Clear the previous event
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clear();
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rndmPtr = r;
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// Select particles of interest for later analysis
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primaryVertex.SetXYZT(-1000000., -1000000., -1000000., -1000000.);
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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 and c quarks, and taus with some basic cuts
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// Ignore photon and guon bremmstrahlung
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if(abs(particle.id()) == 5 &&
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abs(event[particle.daughter1()].id()) != 5 &&
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particle.pT() > 5. &&
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abs(particle.eta()) < 10.) {
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bQuarks.push_back(TParticle(particle.id(),
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particle.status(),
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particle.mother1(),
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i, // Mother 2 is mostly useless; Store particle location for later navigation of partial pythia list
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particle.daughter1(),
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particle.daughter2(),
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particle.px(),
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particle.py(),
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particle.pz(),
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particle.e(),
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particle.xProd(),
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particle.yProd(),
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particle.zProd(),
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particle.tProd())
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);
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}
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if(abs(particle.id()) == 4 &&
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abs(event[particle.daughter1()].id()) != 4 &&
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particle.pT() > 5. &&
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abs(particle.eta()) < 10.) {
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cQuarks.push_back(TParticle(particle.id(),
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particle.status(),
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particle.mother1(),
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i, // Mother 2 is mostly useless; Store particle location for later navigation of partial pythia list
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particle.daughter1(),
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particle.daughter2(),
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particle.px(),
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particle.py(),
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particle.pz(),
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particle.e(),
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particle.xProd(),
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particle.yProd(),
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particle.zProd(),
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particle.tProd())
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);
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}
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if(abs(particle.id()) == 15 &&
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abs(event[particle.daughter1()].id()) != 15 &&
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particle.pT() > 5. &&
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abs(particle.eta()) < 10.) {
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genTaus.push_back(TParticle(particle.id(),
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particle.status(),
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particle.mother1(),
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i, // Mother 2 is mostly useless; Store particle location for later navigation of partial pythia list
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particle.daughter1(),
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particle.daughter2(),
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particle.px(),
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particle.py(),
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particle.pz(),
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particle.e(),
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particle.xProd(),
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particle.yProd(),
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particle.zProd(),
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particle.tProd())
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);
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TLorentzVector visP;
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for(int k = particle.daughter1(); k < particle.daughter2(); k++) {
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if(abs(event[k].isVisible())) {
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TLorentzVector kP(event[k].px(), event[k].py(), event[k].pz(), event[k].e());
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visP += kP;
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}
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}
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visTaus.push_back(TParticle(particle.id(),
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particle.status(),
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particle.mother1(),
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i, // Mother 2 is mostly useless; Store particle location for later navigation of partial pythia list
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particle.daughter1(),
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particle.daughter2(),
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visP.Px(),
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visP.Py(),
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visP.Pz(),
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visP.E(),
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particle.xProd(),
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particle.yProd(),
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particle.zProd(),
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particle.tProd())
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);
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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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if(primaryVertex.X() < -9999.) {
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primaryVertex.SetXYZT(particle.xProd(), particle.yProd(), particle.zProd(), particle.tProd());
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}
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TParticle smearedParticle;
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setCommon(particle, smearedParticle);
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// Select electrons within detector acceptance
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if(abs(particle.id()) == 11 && particle.pT() > 5. && abs(particle.eta()) < 2.5) {
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emSmear(particle, smearedParticle);
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electrons.push_back(smearedParticle);
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}
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// Select muons within detector acceptance
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else if(abs(particle.id()) == 13 && particle.pT() > 5. && abs(particle.eta()) < 2.5) {
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float randomNumber = rndmPtr->flat();
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tkSmear(particle, smearedParticle);
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muons.push_back(smearedParticle);
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}
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// Select other charged tracks and smear them
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else if(abs(particle.charge()) != 0) {
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tkSmear(particle, smearedParticle);
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chargedHadrons.push_back(smearedParticle);
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}
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// Select photons and smear them
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else if(particle.id() == 22) {
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emSmear(particle, smearedParticle);
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photons.push_back(smearedParticle);
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}
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// Select other neutral particles and smear them
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else {
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hdSmear(particle, smearedParticle);
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neutralHadrons.push_back(smearedParticle);
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}
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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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makeETSums();
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return true;
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}
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void UltraFastSim::clear() {
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genTaus.clear();
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bQuarks.clear();
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cQuarks.clear();
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photons.clear();
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electrons.clear();
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muons.clear();
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visTaus.clear();
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taus.clear();
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chargedHadrons.clear();
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neutralHadrons.clear();
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jets.clear();
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ET = 0;
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HT = 0;
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MET = TLorentzVector();
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MHT = TLorentzVector();
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}
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void UltraFastSim::makeJets() {
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vector<PseudoJet> particles;
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for(unsigned int i = 0; i < photons.size(); i++) {
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// Take all neutral particles
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particles.push_back(PseudoJet(photons[i].Px(), photons[i].Py(), photons[i].Pz(), photons[i].Energy()));
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}
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for(unsigned int i = 0; i < electrons.size(); i++) {
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// Take in all electrons within 1 mm of the zVertex
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if(abs(electrons[i].Vz() - primaryVertex.Z()) < 1) {
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particles.push_back(PseudoJet(electrons[i].Px(), electrons[i].Py(), electrons[i].Pz(), electrons[i].Energy()));
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}
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}
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for(unsigned int i = 0; i < chargedHadrons.size(); i++) {
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// Take in all chargedHadrons within 1 mm of the primary vertex, (x,y,z)=0
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if(abs(chargedHadrons[i].Vz() - primaryVertex.Z()) < 1) {
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particles.push_back(PseudoJet(chargedHadrons[i].Px(), chargedHadrons[i].Py(), chargedHadrons[i].Pz(), chargedHadrons[i].Energy()));
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}
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}
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for(unsigned int i = 0; i < neutralHadrons.size(); i++) {
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// Take all neutral particles
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particles.push_back(PseudoJet(neutralHadrons[i].Px(), neutralHadrons[i].Py(), neutralHadrons[i].Pz(), neutralHadrons[i].Energy()));
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}
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ClusterSequence cs(particles, JetDefinition(antikt_algorithm, 0.5));
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double ptmin = 15.0;
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vector<PseudoJet> allJets = cs.inclusive_jets(ptmin);
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vector<PseudoJet> sortedJets = sorted_by_pt(allJets);
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for (unsigned int i = 0; i < sortedJets.size(); i++) {
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TLorentzVector jet(sortedJets[i].px(), sortedJets[i].py(), sortedJets[i].pz(), sortedJets[i].e());
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jets.push_back(jet);
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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 < chargedHadrons.size(); i++) {
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// Make sure that there is high PT track seed
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int nObjectsInInnerCone = 0;
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float isolationEnergy = 0.;
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bool itCouldStillBeATau = true;
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TParticle tau(chargedHadrons[i]);
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int charge = chargedHadrons[i].GetPdgCode()/abs(chargedHadrons[i].GetPdgCode());
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if(chargedHadrons[i].Pt() > 5. && abs(chargedHadrons[i].Eta()) < 2.5) {
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for(unsigned int j = 0; j < chargedHadrons.size(); j++) {
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if(i != j) {
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if(chargedHadrons[i].Pt() >= chargedHadrons[j].Pt()) {
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float dRap = fabs(chargedHadrons[i].Eta() - chargedHadrons[j].Eta());
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float dPhi = fabs(chargedHadrons[i].Phi() - chargedHadrons[j].Phi());
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if ( dPhi > M_PI ) dPhi = 2. * M_PI - dPhi;
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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 > 3) {
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itCouldStillBeATau = false;
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break;
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}
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TLorentzVector tauP;
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tau.Momentum(tauP);
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TLorentzVector chP;
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chargedHadrons[j].Momentum(chP);
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tauP += chP;
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tau.SetMomentum(tauP);
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charge += (chargedHadrons[j].GetPdgCode()/abs(chargedHadrons[j].GetPdgCode()));
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}
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else if(dR < 0.5) {
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isolationEnergy += chargedHadrons[j].Energy();
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}
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}
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else {
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itCouldStillBeATau = false;
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break;
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}
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}
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}
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if(abs(charge) != 1) itCouldStillBeATau = false;
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if(itCouldStillBeATau) {
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for(unsigned int j = 0; j < photons.size(); j++) {
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float dRap = fabs(chargedHadrons[i].Eta() - photons[j].Eta());
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float dPhi = fabs(chargedHadrons[i].Phi() - photons[j].Phi());
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if ( dPhi > M_PI ) dPhi = 2. * M_PI - dPhi;
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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) {
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itCouldStillBeATau = false;
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break;
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}
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TLorentzVector tauP;
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tau.Momentum(tauP);
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TLorentzVector phP;
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photons[j].Momentum(phP);
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tauP += phP;
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tau.SetMomentum(tauP);
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}
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else if(dR < 0.5) {
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isolationEnergy += photons[j].Energy();
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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(itCouldStillBeATau && tau.Pt() > 15. && (isolationEnergy / tau.Energy()) < 0.05) {
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tau.SetPdgCode(15 * charge);
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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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void UltraFastSim::makeETSums() {
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// Use all measured particles
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for (unsigned int i = 0; i < chargedHadrons.size(); i++) {
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MET -= TLorentzVector(chargedHadrons[i].Px(), chargedHadrons[i].Py(), 0, 0);
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ET += chargedHadrons[i].Pt();
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}
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for (unsigned int i = 0; i < neutralHadrons.size(); i++) {
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MET -= TLorentzVector(neutralHadrons[i].Px(), neutralHadrons[i].Py(), 0, 0);
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ET += neutralHadrons[i].Pt();
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}
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for (unsigned int i = 0; i < photons.size(); i++) {
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MET -= TLorentzVector(photons[i].Px(), photons[i].Py(), 0, 0);
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ET += photons[i].Pt();
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}
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for (unsigned int i = 0; i < electrons.size(); i++) {
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MET -= TLorentzVector(electrons[i].Px(), electrons[i].Py(), 0, 0);
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ET += electrons[i].Pt();
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}
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for (unsigned int i = 0; i < muons.size(); i++) {
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MET -= TLorentzVector(muons[i].Px(), muons[i].Py(), 0, 0);
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ET += muons[i].Pt();
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}
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// Use jets [includes photons and electrons] and muons
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for (unsigned int i = 0; i < jets.size(); i++) {
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MHT -= TLorentzVector(jets[i].Px(), jets[i].Py(), 0, 0);
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HT += jets[i].Et();
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}
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}
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void UltraFastSim::setCommon(Particle& pyParticle, TParticle& smParticle) {
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smParticle.SetPdgCode(pyParticle.id());
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smParticle.SetStatusCode(pyParticle.status());
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smParticle.SetFirstMother(pyParticle.mother1());
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smParticle.SetLastMother(pyParticle.mother2());
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smParticle.SetFirstDaughter(pyParticle.daughter1());
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smParticle.SetLastDaughter(pyParticle.daughter2());
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smParticle.SetCalcMass(pyParticle.m());
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smParticle.SetProductionVertex(pyParticle.xProd(), pyParticle.yProd(), pyParticle.zProd(), pyParticle.tProd());
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}
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void UltraFastSim::tkSmear(Particle& pyParticle, TParticle& smParticle) {
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if(abs(pyParticle.eta()) < 2.5) {
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double sigma = pow((0.15 * pyParticle.pT() / 1000) * (0.15 * pyParticle.pT() / 1000) + (0.005 * 0.005), 0.5);
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double smear = (1. + rndmPtr->gauss() * sigma);
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smParticle.SetMomentum(pyParticle.px()*smear, pyParticle.py()*smear, pyParticle.pz(), pyParticle.e());
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}
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else {
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hdSmear(pyParticle, smParticle);
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}
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}
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void UltraFastSim::emSmear(Particle& pyParticle, TParticle& smParticle) {
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if(abs(pyParticle.eta()) < 3.0) {
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double sqrte = pow(pyParticle.e(), 0.5);
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double rsqr = ((0.027 / sqrte) * (0.027 / sqrte)) + 0.005 * 0.005 + (0.150 / pyParticle.e()) * (0.150 / pyParticle.e());
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double sigma = pow((pyParticle.e()*rsqr), 0.5);
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double smear = (1. + rndmPtr->gauss() * sigma);
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smParticle.SetMomentum(pyParticle.px()*smear, pyParticle.py()*smear, pyParticle.pz()*smear, pyParticle.e()*smear);
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}
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else {
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hdSmear(pyParticle, smParticle);
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}
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}
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void UltraFastSim::hdSmear(Particle& pyParticle, TParticle& smParticle) {
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double sqrte = pow(pyParticle.e(), 0.5);
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double rsqr = ((1.15 / sqrte) * (1.15 / sqrte)) + 0.055 * 0.055;
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double sigma = pow((pyParticle.e()*rsqr), 0.5);
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double smear = (1. + rndmPtr->gauss() * sigma);
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smParticle.SetMomentum(pyParticle.px()*smear, pyParticle.py()*smear, pyParticle.pz()*smear, pyParticle.e()*smear);
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}
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