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#include "GeneratorInterface/Pythia8Interface/test/analyserhepmc/LeptonAnalyserHepMC.h"
#include "HepMC/GenVertex.h"
#include "HepMC/GenParticle.h"
#include <iterator>
#include <algorithm>
LeptonAnalyserHepMC::LeptonAnalyserHepMC(double aMaxEta, double aThresholdEt)
: MaxEta(aMaxEta), ThresholdEt(aThresholdEt), RConeIsol(0.3), MaxPtIsol(2.), RIdJet(0.3), EpsIdJet(0.6) {
;
}
std::vector<HepMC::GenParticle> LeptonAnalyserHepMC::isolatedLeptons(const HepMC::GenEvent* pEv) {
HepMC::GenEvent::particle_const_iterator part;
HepMC::GenEvent::particle_const_iterator part1;
std::vector<HepMC::GenParticle> isoleptons;
bool lepton = false;
for (part = pEv->particles_begin(); part != pEv->particles_end(); ++part) {
lepton = false;
if (abs((*part)->pdg_id()) == 11)
lepton = true;
if (abs((*part)->pdg_id()) == 13)
lepton = true;
if (!(*part)->end_vertex() && (*part)->status() == 1 && lepton && fabs((*part)->momentum().eta()) < MaxEta &&
(*part)->momentum().perp() > ThresholdEt) {
double eta0 = (*part)->momentum().eta();
double phi0 = (*part)->momentum().phi();
double pti, dist, etai, phii, dphi;
bool isol = true;
for (part1 = pEv->particles_begin(); part1 != part && part1 != pEv->particles_end(); part1++) {
if (!(*part1)->end_vertex() && (*part1)->status() == 1) {
pti = (*part1)->momentum().perp();
etai = (*part1)->momentum().eta();
phii = (*part1)->momentum().phi();
dphi = phi0 - phii;
if (fabs(phi0 - phii - 6.2832) < fabs(dphi))
dphi = phi0 - phii - 6.2832;
if (fabs(phi0 - phii + 6.2832) < fabs(dphi))
dphi = phi0 - phii + 6.2832;
dist = sqrt((eta0 - etai) * (eta0 - etai) + dphi * dphi);
if (dist < RConeIsol && pti > MaxPtIsol) {
isol = false;
break;
}
}
}
if (isol)
isoleptons.push_back(HepMC::GenParticle(**part));
}
}
return isoleptons;
}
int LeptonAnalyserHepMC::nIsolatedLeptons(const HepMC::GenEvent* pEv) {
std::vector<HepMC::GenParticle> isoleptons = isolatedLeptons(pEv);
return isoleptons.size();
}
double LeptonAnalyserHepMC::MinMass(const HepMC::GenEvent* pEv) {
std::vector<HepMC::GenParticle> isoleptons = isolatedLeptons(pEv);
if (isoleptons.size() < 2)
return 0.;
double MinM = 100000.;
std::vector<HepMC::GenParticle>::iterator ipart, ipart1;
for (ipart = isoleptons.begin(); ipart != isoleptons.end(); ipart++) {
for (ipart1 = isoleptons.begin(); ipart1 != isoleptons.end(); ipart1++) {
if (ipart1 == ipart)
continue;
double px = ipart->momentum().px() + ipart1->momentum().px();
double py = ipart->momentum().py() + ipart1->momentum().py();
double pz = ipart->momentum().pz() + ipart1->momentum().pz();
double e = ipart->momentum().e() + ipart1->momentum().e();
double mass = sqrt(e * e - px * px - py * py - pz * pz);
if (mass < MinM)
MinM = mass;
}
}
return MinM;
}
std::vector<fastjet::PseudoJet> LeptonAnalyserHepMC::removeLeptonsFromJets(std::vector<fastjet::PseudoJet>& jets,
const HepMC::GenEvent* pEv) {
std::vector<HepMC::GenParticle> isoleptons = isolatedLeptons(pEv);
if (isoleptons.empty())
return jets;
std::vector<fastjet::PseudoJet>::iterator ijet;
std::vector<HepMC::GenParticle>::iterator ipart;
std::vector<fastjet::PseudoJet> newjets;
for (ijet = jets.begin(); ijet != jets.end(); ijet++) {
if (fabs(ijet->rap()) > 5.0)
continue;
bool isLepton = false;
for (ipart = isoleptons.begin(); ipart != isoleptons.end(); ipart++) {
fastjet::PseudoJet fjLept(
ipart->momentum().px(), ipart->momentum().py(), ipart->momentum().pz(), ipart->momentum().e());
//cout << "lepton eta = " << fjLept.rap() << endl;
if (fjLept.squared_distance(*ijet) < RIdJet * RIdJet &&
fabs(ijet->e() - ipart->momentum().e()) / ijet->e() < EpsIdJet)
isLepton = true;
}
if (!isLepton)
newjets.push_back(*ijet);
}
return newjets;
}
#if 0
vector<Jet> LeptonAnalyserHepMC::removeLeptonsFromJets(vector<Jet>& jets,
HepMC::GenEvent* pEv)
{
vector<HepMC::GenParticle> isoleptons = isolatedLeptons(pEv);
if(isoleptons.empty()) return jets;
vector<Jet>::iterator ijet;
vector<HepMC::GenParticle>::iterator ipart;
#if 00
// this code can be used if first argument is vector<Jet>, not vector<Jet>&
for ( ijet = jets.begin(); ijet < jets.end(); ijet++) {
bool bad = false;
for ( ipart=isoleptons.begin(); ipart != isoleptons.end(); ipart++) {
JetableObject jpart(*ipart);
if(ijet->dist(jpart) < RIdJet &&
fabs(ijet->e()-ipart->momentum().e())/ijet->e() < EpsIdJet )
bad = true;
}
if(bad) {ijet = jets.erase(ijet); ijet--;}
}
return jets;
#endif
vector<Jet> newjets;
for ( ijet = jets.begin(); ijet != jets.end(); ijet++) {
bool islepton = false;
for ( ipart=isoleptons.begin(); ipart != isoleptons.end(); ipart++) {
JetableObject jpart(*ipart);
if(ijet->dist(jpart) < RIdJet &&
fabs(ijet->e()-ipart->momentum().e())/ijet->e() < EpsIdJet )
islepton = true;
}
if(!islepton) newjets.push_back(*ijet);
}
return newjets;
}
#endif
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