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romanPotsAnalysis_StaticMatrix.C
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romanPotsAnalysis_StaticMatrix.C
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//-------------------------
//
// Simple analysis code to analyze EPIC simulation output for Roman Pots
//
// Author: Alex Jentsch
//
// Date of last author update: 2/16/2022
//
//------------------------
using namespace std;
void romanPotsAnalysis_StaticMatrix(){
TString fileList = "./inputFileList_DVCS_18x275_updated.list";
TString outputName = "EPIC_DVCS_Simulation_Output_";
TString date = "2_16_2023_";
TString run = "run_0";
cout << "Input FileList: " << fileList << endl;
TString fileType_ROOT = ".root";
TString outputFileName = outputName + date + run + fileType_ROOT;
string fileName;
TFile * inputRootFile;
TTree * rootTree;
cout << "Output file: " << outputFileName << endl;
ifstream fileListStream;
fileListStream.open(fileList);
if(!fileListStream) { cout << "NO_LIST_FILE " << fileList << endl; return;}
//---------------------Roman Pots reconstruction constants------------------
//N.B. this is all bullshit for right now while we solve the online reco problem
double local_x_offset_station_1 = -833.3878326;
double local_x_offset_station_2 = -924.342804;
double local_x_slope_offset = -0.00622147;
double local_y_slope_offset = -0.0451035;
double crossingAngle; // -0.025
double nomMomentum = 275.0;
//simplified transfer matrix for X_L = 1.0 (beam orbit)
const double aXRP[2][2] = {{2.102403743, 29.11067626},
{0.186640381, 0.192604619}};
const double aYRP[2][2] = {{0.0000159900, 3.94082098},
{0.0000079946, -0.1402995}};
double aXRPinv[2][2] = {{0.0, 0.0},
{0.0, 0.0}};
double aYRPinv[2][2] = {{0.0, 0.0},
{0.0, 0.0}};
double det = aXRP[0][0] * aXRP[1][1] - aXRP[0][1] * aXRP[1][0];
if (det == 0) {
cout << "ERROR: Reco matrix determinant = 0! Matrix cannot be inverted! Double-check matrix!" << endl;
return;
}
aXRPinv[0][0] = aXRP[1][1] / det;
aXRPinv[0][1] = -aXRP[0][1] / det;
aXRPinv[1][0] = -aXRP[1][0] / det;
aXRPinv[1][1] = aXRP[0][0] / det;
det = aYRP[0][0] * aYRP[1][1] - aYRP[0][1] * aYRP[1][0];
aYRPinv[0][0] = aYRP[1][1] / det;
aYRPinv[0][1] = -aYRP[0][1] / det;
aYRPinv[1][0] = -aYRP[1][0] / det;
aYRPinv[1][1] = aYRP[0][0] / det;
//--------------------------------------------------------------------------
//histograms
TH1D* eta_MC = new TH1D("h_eta",";Pseudorapidity, #eta",100,0.0,15.0);
TH1D* energy_MC = new TH1D("h_energy_MC",";E_{MC} [GeV]",100,0,300);
TH1D* px_MC = new TH1D("px_MC", ";p_{x} [GeV/c]", 100, -10.0, 10.0);
TH1D* py_MC = new TH1D("py_MC", ";p_{y} [GeV/c]", 100, -10.0, 10.0);
TH1D* pt_MC = new TH1D("pt_MC", ";p_{t} [GeV/c]", 100, 0.0, 2.0);
TH1D* pz_MC = new TH1D("pz_MC", ";p_{z} [GeV/c]", 100, 0.0, 320.0);
TH2D* dvcs_photon_thetaPhi_MC = new TH2D("dvcs_photon_theta_phi_MC", ";Pseudorapidity, #eta; Azimuthal Angle, #phi [rad.]", 100, -4.0, 4.0, 100, -TMath::Pi()-0.1, TMath::Pi()+0.1);
TH2D* dvcs_proton_thetaPhi_MC = new TH2D("dvcs_proton_theta_phi_MC", ";Pseudorapidity, #eta; Azimuthal Angle, #phi [rad.]", 100, -10.0, 10.0, 100, -TMath::Pi()-0.1, TMath::Pi()+0.1);
TH2D* emcal_hit_map_theta_phi_reco = new TH2D("emcal_hit_map_theta_phi", ";Pseudorapidity, #eta; Azimuthal Angle, #phi [rad.]", 100, -4.0, 4.0, 100, -TMath::Pi()-0.1, TMath::Pi()+0.1);
TH1D* px_smearedFF = new TH1D("px_smearedFF", ";p_{x} [GeV/c]", 100, -10.0, 10.0);
TH1D* py_smearedFF = new TH1D("py_smearedFF", ";p_{y} [GeV/c]", 100, -10.0, 10.0);
TH1D* pt_smearedFF = new TH1D("pt_smearedFF", ";p_{t} [GeV/c]", 100, 0.0, 2.0);
TH1D* pz_smearedFF = new TH1D("pz_smearedFF", ";p_{z} [GeV/c]", 100, 0.0, 320.0);
TH1D* px_RomanPots = new TH1D("px_RomanPots", ";p_{x} [GeV/c]", 100, -10.0, 10.0);
TH1D* py_RomanPots = new TH1D("py_RomanPots", ";p_{y} [GeV/c]", 100, -10.0, 10.0);
TH1D* pt_RomanPots = new TH1D("pt_RomanPots", ";p_{t} [GeV/c]", 100, 0.0, 2.0);
TH1D* pz_RomanPots = new TH1D("pz_RomanPots", ";p_{z} [GeV/c]", 100, 0.0, 320.0);
TH2D* rp_occupancy_map = new TH2D("Roman_pots_occupancy_map", "Roman_pots_occupancy_map", 100, -1100, -700, 100, -70, -70);
int fileCounter = 0;
int iEvent = 0;
while(getline(fileListStream, fileName)){
TString tmp = fileName;
cout << "Input file " << fileCounter << ": " << fileName << endl;
inputRootFile = new TFile(tmp);
if(!inputRootFile){ cout << "MISSING_ROOT_FILE"<< fileName << endl; continue;}
fileCounter++;
TTree * evtTree = (TTree*)inputRootFile->Get("events");
int numEvents = evtTree->GetEntries();
TTreeReader tree_reader(evtTree); // !the tree reader
//MC particles
TTreeReaderArray<float> mc_px_array = {tree_reader, "MCParticles.momentum.x"};
TTreeReaderArray<float> mc_py_array = {tree_reader, "MCParticles.momentum.y"};
TTreeReaderArray<float> mc_pz_array = {tree_reader, "MCParticles.momentum.z"};
TTreeReaderArray<double> mc_mass_array = {tree_reader, "MCParticles.mass"};
TTreeReaderArray<int> mc_pdg_array = {tree_reader, "MCParticles.PDG"};
//generated particles
TTreeReaderArray<float> gen_px_array = {tree_reader, "GeneratedParticles.momentum.x"};
TTreeReaderArray<float> gen_py_array = {tree_reader, "GeneratedParticles.momentum.y"};
TTreeReaderArray<float> gen_pz_array = {tree_reader, "GeneratedParticles.momentum.z"};
TTreeReaderArray<double> gen_mass_array = {tree_reader, "GeneratedParticles.mass"};
TTreeReaderArray<int> gen_pdg_array = {tree_reader, "GeneratedParticles.PDG"};
// Roman Pots
TTreeReaderArray<float> reco_hits_RP_x = {tree_reader, "ForwardRomanPotRecHits.position.x"};
TTreeReaderArray<float> reco_hits_RP_y = {tree_reader, "ForwardRomanPotRecHits.position.y"};
TTreeReaderArray<float> reco_hits_RP_z = {tree_reader, "ForwardRomanPotRecHits.position.z"};
// FastSmearing plugin
TTreeReaderArray<float> reco_fast_FarForward_px = {tree_reader, "SmearedFarForwardParticles.momentum.x"};
TTreeReaderArray<float> reco_fast_FarForward_py = {tree_reader, "SmearedFarForwardParticles.momentum.y"};
TTreeReaderArray<float> reco_fast_FarForward_pz = {tree_reader, "SmearedFarForwardParticles.momentum.z"};
TTreeReaderArray<int> reco_fast_FarForward_PDG = {tree_reader, "SmearedFarForwardParticles.PDG"};
//EMCAL branches
TTreeReaderArray<float> barrelEMCAL_phi = {tree_reader, "EcalBarrelSciGlassTruthClusters.intrinsicPhi"};
TTreeReaderArray<float> barrelEMCAL_theta = {tree_reader, "EcalBarrelSciGlassTruthClusters.intrinsicTheta"};
TTreeReaderArray<float> negEndCapEMCAL_phi = {tree_reader, "EcalEndcapNTruthClusters.intrinsicPhi"};
TTreeReaderArray<float> negEndCapEMCAL_theta = {tree_reader, "EcalEndcapNTruthClusters.intrinsicTheta"};
TTreeReaderArray<float> posEndCapEMCAL_phi = {tree_reader, "EcalEndcapPTruthClusters.intrinsicPhi"};
TTreeReaderArray<float> posEndCapEMCAL_theta = {tree_reader, "EcalEndcapPTruthClusters.intrinsicTheta"};
cout << "file has " << evtTree->GetEntries() << " events..." << endl;
tree_reader.SetEntriesRange(0, evtTree->GetEntries());
while (tree_reader.Next()) {
cout << "Reading event: " << iEvent << endl;
//MCParticles
//finding the far-forward proton;
//TLorentzVector scatMC(0,0,0,0);
TVector3 mctrk;
bool goodHit1 = false;
bool goodHit2 = false;
//skip events entirely with no RP hits to remove acceptance loss
if(reco_hits_RP_x.GetSize() < 1){iEvent++; continue; }
if(reco_hits_RP_x.GetSize() > 3){
double goodHitX[2] = {0.0, 0.0};
double goodHitY[2] = {0.0, 0.0};
double goodHitZ[2] = {0.0, 0.0};
for(int iHit = 0; iHit < reco_hits_RP_x.GetSize(); iHit++){
cout << "hit "<< iHit <<" - (z, x) = (" << reco_hits_RP_z[iHit] << ", " << reco_hits_RP_x[iHit] <<")"<< endl;
if(!goodHit2 && reco_hits_RP_z[iHit] > 27099.0 && reco_hits_RP_z[iHit] < 28022.0){
goodHitX[1] = reco_hits_RP_x[iHit];
goodHitY[1] = reco_hits_RP_y[iHit];
goodHitZ[1] = reco_hits_RP_z[iHit];
goodHit2 = true;
}
if(!goodHit1 && reco_hits_RP_z[iHit] > 25099.0 && reco_hits_RP_z[iHit] < 26022.0){
goodHitX[0] = reco_hits_RP_x[iHit];
goodHitY[0] = reco_hits_RP_y[iHit];
goodHitZ[0] = reco_hits_RP_z[iHit];
goodHit1 = true;
}
}
}
if(!goodHit1 || !goodHit2){ iEvent++; continue; }
double maxPt=-99.;
for(int imc=0;imc<mc_px_array.GetSize();imc++){
mctrk.SetXYZ(mc_px_array[imc], mc_py_array[imc], mc_pz_array[imc]);
if(mc_pdg_array[imc] == 2212 && mctrk.Perp() > 0.1){
mctrk.RotateY(0.025);
eta_MC->Fill(mctrk.Eta());
px_MC->Fill(mctrk.Px());
py_MC->Fill(mctrk.Py());
pt_MC->Fill(mctrk.Perp());
pz_MC->Fill(mctrk.Pz());
}
if(mc_pdg_array[imc] == 22){
dvcs_photon_thetaPhi_MC->Fill(mctrk.Eta(), mctrk.Phi());
}
}
for(int igen=0;igen<gen_px_array.GetSize();igen++){
mctrk.SetXYZ(gen_px_array[igen], gen_py_array[igen], gen_pz_array[igen]);
if(gen_pdg_array[igen] == 22){
dvcs_photon_thetaPhi_MC->Fill(mctrk.Eta(), mctrk.Phi());
}
if(gen_pdg_array[igen] == 2212){
dvcs_proton_thetaPhi_MC->Fill(mctrk.Eta(), mctrk.Phi());
}
}
for(int ical=0;ical<barrelEMCAL_phi.GetSize();ical++){
double radians = barrelEMCAL_theta[ical];
double eta = -TMath::Log(TMath::Tan(radians/2.0));
emcal_hit_map_theta_phi_reco->Fill(eta, barrelEMCAL_phi[ical]);
}
for(int ical=0;ical<negEndCapEMCAL_phi.GetSize();ical++){
double radians = negEndCapEMCAL_theta[ical];
double eta = -TMath::Log(TMath::Tan(radians/2.0));
emcal_hit_map_theta_phi_reco->Fill(eta, negEndCapEMCAL_phi[ical]);
}
for(int ical=0;ical<posEndCapEMCAL_phi.GetSize();ical++){
double radians = posEndCapEMCAL_theta[ical];
double eta = -TMath::Log(TMath::Tan(radians/2.0));
emcal_hit_map_theta_phi_reco->Fill(eta, posEndCapEMCAL_phi[ical]);
}
if(mctrk.Perp() > 0.1){
for(int iSFFPart = 0; iSFFPart < reco_fast_FarForward_px.GetSize(); iSFFPart++){
TVector3 smearedFFtrk(reco_fast_FarForward_px[iSFFPart], reco_fast_FarForward_py[iSFFPart], reco_fast_FarForward_pz[iSFFPart]);
if(reco_fast_FarForward_PDG[iSFFPart]==2212){
smearedFFtrk.RotateY(0.025);
px_smearedFF->Fill(smearedFFtrk.Px());
py_smearedFF->Fill(smearedFFtrk.Py());
pt_smearedFF->Fill(smearedFFtrk.Perp());
pz_smearedFF->Fill(smearedFFtrk.Pz());
}
}
goodHit1 = false;
goodHit2 = false;
//for(int iRpHit = 0; iRpHit < reco_hits_RP_x.GetSize(); iRpHit++){
if(reco_hits_RP_x.GetSize() > 3){
double goodHitX[2] = {0.0, 0.0};
double goodHitY[2] = {0.0, 0.0};
double goodHitZ[2] = {0.0, 0.0};
//bool goodHit1 = false;
//bool goodHit2 = false;
for(int iHit = 0; iHit < reco_hits_RP_x.GetSize(); iHit++){
cout << "hit "<< iHit <<" - (z, x) = (" << reco_hits_RP_z[iHit] << ", " << reco_hits_RP_x[iHit] <<")"<< endl;
if(!goodHit2 && reco_hits_RP_z[iHit] > 27099.0 && reco_hits_RP_z[iHit] < 28022.0){
goodHitX[1] = reco_hits_RP_x[iHit];
goodHitY[1] = reco_hits_RP_y[iHit];
goodHitZ[1] = reco_hits_RP_z[iHit];
goodHit2 = true;
}
if(!goodHit1 && reco_hits_RP_z[iHit] > 25099.0 && reco_hits_RP_z[iHit] < 26022.0){
goodHitX[0] = reco_hits_RP_x[iHit];
goodHitY[0] = reco_hits_RP_y[iHit];
goodHitZ[0] = reco_hits_RP_z[iHit];
goodHit1 = true;
}
}
if(!goodHit1 || !goodHit2){ continue; }
rp_occupancy_map->Fill(goodHitX[0], goodHitY[0]);
cout << "good hit 1st layer: " << " - (z, x) = (" << goodHitZ[0] << ", " << goodHitX[0] <<")"<< endl;
cout << "good hit 2nd layer: " << " - (z, x) = (" << goodHitZ[1] << ", " << goodHitX[1] <<")"<< endl;
// extract hit, subtract orbit offset – this is to get the hits in the coordinate system of the orbit
// trajectory
double XL[2] = {goodHitX[0] - local_x_offset_station_1, goodHitX[1] - local_x_offset_station_2};
double YL[2] = {goodHitY[0], goodHitY[1]};
double base = goodHitZ[1] - goodHitZ[0];
cout << "Z-distance = " << base << endl;
if (base == 0) {
cout << "ERROR: Detector separation = 0! Cannot calculate slope!" << endl;
continue;
}
double Xip[2] = {0.0, 0.0};
double Xrp[2] = {XL[1], (1000 * (XL[1] - XL[0]) / (base)) - local_x_slope_offset}; //- _SX0RP_;
double Yip[2] = {0.0, 0.0};
double Yrp[2] = {YL[1], (1000 * (YL[1] - YL[0]) / (base)) - local_y_slope_offset}; //- _SY0RP_;
// use the hit information and calculated slope at the RP + the transfer matrix inverse to calculate the
// Polar Angle and deltaP at the IP
for (unsigned i0 = 0; i0 < 2; i0++) {
for (unsigned i1 = 0; i1 < 2; i1++) {
Xip[i0] += aXRPinv[i0][i1] * Xrp[i1];
Yip[i0] += aYRPinv[i0][i1] * Yrp[i1];
}
}
// convert polar angles to radians
double rsx = Xip[1] / 1000.;
double rsy = Yip[1] / 1000.;
// calculate momentum magnitude from measured deltaP – using thin lens optics.
double p = nomMomentum * (1 + 0.01 * Xip[0]);
double norm = std::sqrt(1.0 + rsx * rsx + rsy * rsy);
//double prec[3] = {(p * rsx / norm), (p * rsy / norm), (p / norm)};
TVector3 prec_romanpots((p * rsx / norm), (p * rsy / norm), (p / norm));
px_RomanPots->Fill(prec_romanpots.Px());
py_RomanPots->Fill(prec_romanpots.Py());
pt_RomanPots->Fill(prec_romanpots.Perp());
pz_RomanPots->Fill(prec_romanpots.Pz());
}
}
iEvent++;
}// event loop
inputRootFile->Close();
}// input file loop
cout << "Check integrals: " << endl;
cout << "pt_mc integral = " << pt_MC->Integral() << endl;
cout << "pt_RP_reco integral = " << pt_RomanPots->Integral() << endl;
TFile * outputFile = new TFile(outputFileName, "RECREATE");
eta_MC->Write();
px_MC->Write();
py_MC->Write();
pt_MC->Write();
pz_MC->Write();
px_smearedFF->Write();
py_smearedFF->Write();
pt_smearedFF->Write();
pz_smearedFF->Write();
px_RomanPots->Write();
py_RomanPots->Write();
pt_RomanPots->Write();
pz_RomanPots->Write();
energy_MC->Write();
rp_occupancy_map->Write();
dvcs_photon_thetaPhi_MC->Write();
dvcs_proton_thetaPhi_MC->Write();
emcal_hit_map_theta_phi_reco->Write();
outputFile->Close();
return;
}