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 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 ;
)