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Replacing nu with y

Merged Replacing nu with y
ziyue_work_branch into master
Merged Ziyue Zhang requested to merge ziyue_work_branch into master
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benchmarks/dvmp/analysis/dvmp.h
+ 101
− 62
@@ -19,95 +19,134 @@ namespace util {
//========================================================================================================
// for structure functions
struct inv_quant { // add more when needed
double nu, Q2, x, t;
double nu, Q2, x, y, t;
};
// for simu
inline inv_quant calc_inv_quant_sim(const std::vector<ROOT::Math::PxPyPzMVector>& parts)
{
ROOT::Math::PxPyPzMVector q(parts[0] - parts[2]);
ROOT::Math::PxPyPzMVector P(parts[3]);
//ROOT::Math::PxPyPzMVector Delta(parts[6] - parts[3]);//exact jpsi
ROOT::Math::PxPyPzMVector Delta(parts[0] - parts[2] - parts[7] - parts[8]);//jpsi->l l' gamma, ignore gamma
double nu = q.Dot(P) / P.mass();
double Q2 = -q.Dot(q);
double t = Delta.Dot(Delta);
inv_quant quantities = {nu, Q2, Q2/2./P.mass()/nu, t};
return quantities;
//import Geant4 and set the wanted particles in the intended order
//0:e0 1:p0 2:e1 3:p1 4:recoil system (without p1) 5:l1 from 4 6:l2 from 4
inline auto momenta_sort_sim(const std::vector<dd4pod::Geant4ParticleData>& parts, std::string_view mother, std::string_view daughter){//mother and daughter are not used yet; will be useful when generater is different and/or when the mcparticles doesn't follow the same order in all events
std::vector<ROOT::Math::PxPyPzMVector> momenta{7};
int order_map[7] = {0, 3, 2, 6, 5, 7, 8};
for(int i = 0 ; i < 7 ; i++){
double px = parts[order_map[i]].psx;
double py = parts[order_map[i]].psy;
double pz = parts[order_map[i]].psz;
double mass = parts[order_map[i]].mass;
double e = sqrt(px*px + py*py + pz*pz + mass*mass);
momenta[i].SetPxPyPzE(px, py, pz, e);
}
//for(int i = 0 ; i < 7 ; i++){
// cout<<Form("sim, idx = %d, P(px, py, pz, mass) = (%f, %f, %f, %f)", i, momenta[i].px(), momenta[i].py(), momenta[i].pz(), momenta[i].mass())<<endl;
//}
//cout<<"========================================="<<endl;
return momenta;
}
//for Dummy rc
inline inv_quant calc_inv_quant_rec(const std::vector<ROOT::Math::PxPyPzMVector>& parts, const double pdg_mass, const double daughter_mass){
//import Reconstructed particles and set the wanted particles in the intended order========================
inline auto momenta_sort_rec(const std::vector<eic::ReconstructedParticleData>& parts, std::string_view mother, std::string_view daughter){
std::vector<ROOT::Math::PxPyPzMVector> momenta{7};
//0:e0 1:p0 2:e1 3:p1 4:recoil system (without p1) 5:l1 from recoil decay 6:l2 from recoil decay
for(int i = 0 ; i < 7 ; i++) momenta[i].SetPxPyPzE(0., 0., 0., 0.); //initialize as all 0
//manually set incoming electron and proton;
double e0_mass = get_pdg_mass("electron");
double e0_pz = 1.305e-8 - 10.;
momenta[0].SetPxPyPzE(0., 0., e0_pz, sqrt(e0_mass*e0_mass + e0_pz*e0_pz));
double p0_mass = get_pdg_mass("proton");
double p0_pz = 99.995598 + 1.313e-7 + 8.783e-11;
momenta[1].SetPxPyPzE(0., 0., p0_pz, sqrt(p0_mass*p0_mass + p0_pz*p0_pz));
//FIXME search for recoil proton, add feature to deal with multiple protons in one event
for(int i = 0 ; i < parts.size() ; i++){
if(parts[i].pid!=2212) continue;
//px, py, pz, e, mass are not consistent for smeared dummy rc. this is a temp solution, replacing non-smeared energy by the re-calculated energy
//double energy_tmp = sqrt(parts[i].p.x*parts[i].p.x + parts[i].p.y*parts[i].p.y + parts[i].p.z*parts[i].p.z + parts[i].mass*parts[i].mass);//tmpsolution
double energy_tmp = parts[i].energy;
momenta[3].SetPxPyPzE(parts[i].p.x, parts[i].p.y, parts[i].p.z, energy_tmp);
}
//search for di-lepton pair for the decay in recoil
int daughter_pid = -1; //unsigned
if(daughter == "electron"){
daughter_pid = 11;
}else if(daughter == "muon"){
daughter_pid = 13;
}
int first = -1;
int second = -1;
double best_mass = -1;
// go through all particle combinatorics, calculate the invariant mass
// for each combination, and remember which combination is the closest
// to the desired pdg_mass
for (int i = 0; i < parts.size(); ++i) {
if( fabs(parts[i].mass() - daughter_mass)/daughter_mass > 0.01) continue;
for (int j = i + 1; j < parts.size(); ++j) {
if( fabs(parts[j].mass() - daughter_mass)/daughter_mass > 0.01) continue;
const double new_mass{(parts[i] + parts[j]).mass()};
if (fabs(new_mass - pdg_mass) < fabs(best_mass - pdg_mass)) {
double best_mass = -999.;
for (int i = 0 ; i < parts.size() ; ++i) {
if( fabs(parts[i].pid)!=daughter_pid) continue;
for (int j = i + 1 ; j < parts.size() ; ++j) {
if( parts[j].pid!= - parts[i].pid) continue;
ROOT::Math::PxPyPzMVector lpt_1(0.,0.,0.,0.);
//double energy_tmp1 = sqrt(parts[i].p.x*parts[i].p.x + parts[i].p.y*parts[i].p.y + parts[i].p.z*parts[i].p.z + parts[i].mass*parts[i].mass);//tmpsolution
double energy_tmp1 = parts[i].energy;
lpt_1.SetPxPyPzE(parts[i].p.x, parts[i].p.y, parts[i].p.z, energy_tmp1);
ROOT::Math::PxPyPzMVector lpt_2(0.,0.,0.,0.);
//double energy_tmp2 = sqrt(parts[j].p.x*parts[j].p.x + parts[j].p.y*parts[j].p.y + parts[j].p.z*parts[j].p.z + parts[j].mass*parts[j].mass);//tmpsolution
double energy_tmp2 = parts[j].energy;
lpt_2.SetPxPyPzE(parts[j].p.x, parts[j].p.y, parts[j].p.z, energy_tmp2);
const double new_mass{(lpt_1 + lpt_2).mass()};
if (fabs(new_mass - get_pdg_mass(mother)) < fabs(best_mass - get_pdg_mass(mother))) {
first = i;
second = j;
best_mass = new_mass;
momenta[5].SetPxPyPzE(parts[i].p.x, parts[i].p.y, parts[i].p.z, energy_tmp1);
momenta[6].SetPxPyPzE(parts[j].p.x, parts[j].p.y, parts[j].p.z, energy_tmp2);
}
}
}
if (first < 0 || parts.size() < 3 ){ //fewer than 3 candidates
inv_quant quantities = {-99999., -99999., -99999., -99999.};
return quantities;
}
//construct the beam kinematics
ROOT::Math::PxPyPzMVector pair_4p(parts[first] + parts[second]);
ROOT::Math::PxPyPzMVector e1, P;
//double e1_Energy = sqrt(10.*10. + get_pdg_mass("electron")*get_pdg_mass("electron"));
//double P_Energy = sqrt(100.*100. + get_pdg_mass("proton")*get_pdg_mass("proton"));
double e1_Energy = sqrt((1.305e-8 - 10.)*(1.305e-8 - 10.) + (0.0005109+9.888e-8)*(0.0005109+9.888e-8));
double P_Energy = sqrt((99.995598 + 1.313e-7)*(99.995598 + 1.313e-7) + (0.938272-1.23e-12)*(0.938272-1.23e-12));
e1.SetPxPyPzE(0., 0., 1.305e-8 - 10., e1_Energy);
P.SetPxPyPzE(0., 0., 99.995598 + 1.313e-7, P_Energy);
int scatteredIdx = -1;
//FIXME search for scattered electron, need improvement with more complex events
//float dp = 10.;
for(int i = 0 ; i < parts.size(); i++){
if(i==first || i==second) continue; //skip the paired leptons
//if( fabs(parts[i].mass() - get_pdg_mass("electron"))/get_pdg_mass("electron") > 0.01) continue;
if( fabs(parts[i].mass() - 0.0005109 - 9.888e-8)/(0.0005109 + 9.888e-8) > 0.01) continue;
//ROOT::Math::PxPyPzMVector k_prime(parts[i]); //scattered
//float ptmp = sqrt(parts[i].px()*parts[i].px() + parts[i].py()*parts[i].py() + parts[i].pz()*parts[i].pz());
if(parts[i].pid != 11) continue;
//float ptmp = sqrt(parts[i].p.x*parts[i].p.x + parts[i].p.y*parts[i].p.y + parts[i].p.z*parts[i].p.z);
//if( (k_prime.px()) * (pair_4p.px()) + (k_prime.py()) * (pair_4p.py()) + (k_prime.pz()) * (pair_4p.pz()) > 0. || ptmp >= 10.) continue; //angle between jpsi and scattered electron < pi/2, 3-momentum mag < 10.
//if(dp > 10.- ptmp){ //if there are more than one candidate of scattered electron, choose the one with highest 3-momentum mag
scatteredIdx = i;
//double energy_tmp = sqrt(parts[i].p.x*parts[i].p.x + parts[i].p.y*parts[i].p.y + parts[i].p.z*parts[i].p.z + parts[i].mass*parts[i].mass);//tmpsolution
double energy_tmp = parts[i].energy;
momenta[2].SetPxPyPzE(parts[i].p.x, parts[i].p.y, parts[i].p.z, energy_tmp);
// dp = 10. - ptmp;
//}
}
if(scatteredIdx ==-1){
inv_quant quantities = {-99999., -99999., -99999., -99999.};
return quantities;
}
ROOT::Math::PxPyPzMVector q(e1 - parts[scatteredIdx]);
ROOT::Math::PxPyPzMVector Delta(q - pair_4p);
double nu = q.Dot(P) / P.mass();
double Q2 = - q.Dot(q);
double t = Delta.Dot(Delta);
inv_quant quantities = {nu, Q2, Q2/2./P.mass()/nu, t};
//for(int i = 0 ; i < 7 ; i++){
// cout<<Form("dum, idx = %d, P(px, py, pz, mass) = (%f, %f, %f, %f)", i, momenta[i].px(), momenta[i].py(), momenta[i].pz(), momenta[i].mass())<<endl;
//}
//cout<<"========================================="<<endl;
return momenta;
}
inline inv_quant calc_inv_quant(const std::vector<ROOT::Math::PxPyPzMVector>& parts)
{
//0:e0 1:p0 2:e1 3:p1 4:recoil system (without p1) 5:l1 from 4 6:l2 from 4
ROOT::Math::PxPyPzMVector q(parts[0] - parts[2]);
ROOT::Math::PxPyPzMVector k(parts[0]);
ROOT::Math::PxPyPzMVector P(parts[1]);
ROOT::Math::PxPyPzMVector Delta(parts[3] - parts[1]);//exact
ROOT::Math::PxPyPzMVector Delta_prime(parts[0] - parts[2] - parts[5] - parts[6]);//exclude gamma radiation in jpsi decay
double nu = q.Dot(P) / P.mass();
double Q2 = -q.Dot(q);
double t = 0.;
//if(parts[4].px() == 0. && parts[4].py() == 0. && parts[4].pz() == 0. && parts[4].mass() == 0.){
//t = Delta_prime.Dot(Delta_prime);
//}else{
t = Delta.Dot(Delta);
//}
double y = q.Dot(P) / k.Dot(P);
inv_quant quantities = {nu, Q2, Q2/2./P.mass()/nu, y, t};
return quantities;
}
inline double get_nu(inv_quant quantities) { return quantities.nu / 1000.; }
inline double get_Q2(inv_quant quantities) { return quantities.Q2; }
inline double get_x(inv_quant quantities) { return quantities.x; }
inline double get_y(inv_quant quantities) { return quantities.y; }
inline double get_t(inv_quant quantities) { return quantities.t; }
// for tracking, add later