double Qjets::d_ij(const fastjet::PseudoJet& v1,const fastjet::PseudoJet& v2){
double p1 = v1.perp();
double p2 = v2.perp();
double ret = pow(min(p1,p2),_exp_min) * pow(max(p1,p2),_exp_max) * v1.squared_distance(v2);
assert(!isnan((float)ret));
return ret;
}
double Qjets::d_ij(const fastjet::PseudoJet& v1,const fastjet::PseudoJet& v2) {
double p1 = v1.perp();
double p2 = v2.perp();
// small fix here -- nhan
// double ret = pow(min(p1,p2),_exp_min) * pow(max(p1,p2),_exp_max) * v1.squared_distance(v2);
double ret = pow(10.,-5.);
if(v1.squared_distance(v2) != 0.) {
ret = pow(min(p1,p2),_exp_min) * pow(max(p1,p2),_exp_max) *
v1.squared_distance(v2);
}
assert(!std::isnan(ret));
return ret;
}
void InfoRecombiner::recombine(fastjet::PseudoJet const& jet_1, fastjet::PseudoJet const& jet_2, fastjet::PseudoJet& jet) const {
fastjet::JetDefinition::DefaultRecombiner::recombine(jet_1, jet_2, jet);
JetInfo jet_info;
if (jet_1.has_user_info<JetInfo>()) jet_info = jet_1.user_info<JetInfo>();
if (jet_2.has_user_info<JetInfo>()) jet_info += jet_2.user_info<JetInfo>();
jet.set_user_info(new JetInfo(jet_info));
}
double FastJetTopTagger::getECF(fastjet::PseudoJet& jet, int whichECF, const std::string& energyCorr){
/// ********** Energy Correlation Function *** /////////
// options for EnergyCorrelator:
// pt_R (transverse momenta and boost-invariant angles)
// E_theta (energy and angle as dot product of vectors)
// E_inv (energy and angle as (2p_i \cdot p_j/E_i E_j)
if(whichECF > _maxECF)
return -1.0;
if(!jet.has_constituents())
return -1.0;
return _energyCorrMap[energyCorr].at(whichECF)(jet);
} //end
PseudoJet::PseudoJet(fastjet::PseudoJet const& pseudo_jet) :
fastjet::PseudoJet(pseudo_jet)
{
INFO(pseudo_jet.px(), px(), pseudo_jet.py(), py());
}
void ISRboost(fastjet::PseudoJet& bj1,fastjet::PseudoJet& bj2,
const fastjet::PseudoJet& j1,
const vector<int>& candidates,
fastjet::ClusterSequence & cs,
const vector<int>& beam_particles,
double* boostzVec,double *boostxyVec
){
double q0=bj1.E()+bj2.E();
double q2=q0*q0;
double k0_rec=q0-j1.E();
double keith_beta=j1.pz()/k0_rec;
double krec2=j1.px()*j1.px()+j1.py()*j1.py()+j1.pz()*j1.pz();
double krec=sqrt(krec2);
double recMass2=k0_rec*k0_rec-krec2;
boostzVec[0]=0;boostzVec[1]=0;boostzVec[2]=keith_beta;
double jperp=j1.perp();
double Keith_norm=sqrt(recMass2+jperp*jperp);
double boostx=-j1.px()/Keith_norm;
double boosty=-j1.py()/Keith_norm;
boostxyVec[0]=-boostx;boostxyVec[1]=-boosty;boostxyVec[2]=0;
TLorentzVector q(-j1.px(),-j1.py(),-j1.pz(),-j1.E());
TLorentzVector m1(bj1.px(),bj1.py(),bj1.pz(),bj1.E());
TLorentzVector m2(bj2.px(),bj2.py(),bj2.pz(),bj2.E());
q=q+m1+m2;
NAMED_DEBUG("BOOST",
std::cout << "q0: " << q0 << " keith_beta: " << keith_beta << std::endl ;
std::cout << "rebM2: " << recMass2 << std::endl ;
std::cout << "keith norm: " << Keith_norm << std::endl ;
)
//this returns the delta r of a particle to a pseudojet
double MyTopEvent::Return_DR(const Pythia8::Particle & a,const fastjet::PseudoJet & b)
{
double DR(0);
DR = sqrt( pow((a.eta() - b.eta()),2) + pow((a.phi() - b.phi() ),2) );
return DR;
}