Resolve "pi0 resolution for ECal barrel"

Closes #19 (closed)

benchmarks/barrel_ecal/scripts/emcal_barrel_pions_analysis.cxx

@@ -9,12 +9,17 @@
 #include "dd4pod/Geant4ParticleCollection.h"
 #include "dd4pod/CalorimeterHitCollection.h"
 
+#include "benchmark.h"
+#include "mt.h"
+#include "util.h"
+
 #include "TCanvas.h"
 #include "TStyle.h"
 #include "TMath.h"
 #include "TH1.h"
 #include "TF1.h"
 #include "TH1D.h"
+#include "TFitResult.h"
 
 using ROOT::RDataFrame;
 using namespace ROOT::VecOps;
@@ -32,9 +37,32 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
   gStyle->SetPadLeftMargin(0.14);
   gStyle->SetPadRightMargin(0.14);
 
+  //Tests
+  std::string test_tag = "Barrel_emcal_pi0";
+  //TODO: Change test_tag to something else
+  std:string detector = "Barrel_emcal";
+  // Energy resolution in the barrel region(-1 < eta < 1)
+  // Taken from : Initial considerations for EMCal of the EIC detector by A. Bazilevsky
+  // sigma_E / E = 12% / E^0.5 convoluted with 2%
+  // sigma_E / E = [ (0.12/E^0.5)^2 + 0.02^2]^0.5, with E in [GeV]
+  double thrown_energy = 5; // Current thrown energy, will need to grab from json file
+  double resolutionTarget = TMath::Sqrt(0.12 * 0.12 / thrown_energy + 0.02 * 0.02);
+
+  eic::util::Test pi0_energy_resolution{
+      {{"name", fmt::format("{}_energy_resolution", test_tag)},
+       {"title", "Pion0 Energy resolution"},
+       {"description",
+        fmt::format("Pion0 energy resolution with {}, estimated using a Gaussian fit.", detector)},
+       {"quantity", "resolution (in %)"},
+       {"target", std::to_string(resolutionTarget)}}};
+
+
   ROOT::EnableImplicitMT();
   ROOT::RDataFrame d0("events", input_fname);
 
+  // Sampling Fraction
+  double samp_frac = 0.0136;
+
   // Thrown Energy [GeV]
   auto Ethr = [](std::vector<dd4pod::Geant4ParticleData> const& input) {
     std::vector<double> result;
@@ -58,25 +86,69 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
   // Sampling fraction = Esampling / Ethrown
   auto fsam = [](const std::vector<double>& sampled, const std::vector<double>& thrown) {
     std::vector<double> result;
-    for (const auto& E1 : thrown) {
-      for (const auto& E2 : sampled)
-        result.push_back(E2/E1);
+    auto it_sam = sampled.cbegin();
+    auto it_thr = thrown.cbegin();
+    for (; it_sam != sampled.end() && it_thr != thrown.end(); ++it_sam, ++it_thr) {
+        result.push_back(*it_sam / *it_thr);
+    }
+    return result;
+  };
+
+  // Energy Resolution = Esampling/Sampling_fraction - Ethrown
+  auto eResol = [samp_frac](const std::vector<double>& sampled, const std::vector<double>& thrown) {
+    std::vector<double> result;
+    auto it_sam = sampled.cbegin();
+    auto it_thr = thrown.cbegin();
+    for (; it_sam != sampled.end() && it_thr != thrown.end(); ++it_sam, ++it_thr) {
+        result.push_back(*it_sam / samp_frac - *it_thr);
     }
     return result;
   };
 
+  // Relative Energy Resolution = (Esampling/Sampling fraction - Ethrown)/Ethrown
+  auto eResol_rel = [samp_frac](const std::vector<double>& sampled, const std::vector<double>& thrown) {
+    std::vector<double> result;
+    auto it_sam = sampled.cbegin();
+    auto it_thr = thrown.cbegin();
+    for (; it_sam != sampled.end() && it_thr != thrown.end(); ++it_sam, ++it_thr) {
+        result.push_back((*it_sam / samp_frac - *it_thr) / *it_thr);
+    }
+    return result;
+  };
+
+  // Returns the pdgID of the particle
+  auto getpid = [](std::vector<dd4pod::Geant4ParticleData> const& input) {
+    return input[2].pdgID;
+  };
+
+  // Returns number of particle daughters
+  auto getdau = [](std::vector<dd4pod::Geant4ParticleData> const& input) {
+    return input[2].daughters_begin;
+  };
+
   // Define variables
-  auto d1 = d0.Define("Ethr",  Ethr,  {"mcparticles"})
-	      .Define("nhits", nhits, {"EcalBarrelHits"})
-	      .Define("Esim",  Esim,  {"EcalBarrelHits"})
-	      .Define("fsam",  fsam,  {"Esim","Ethr"})
-	      ;
+  auto d1 = d0.Define("Ethr",   Ethr,       {"mcparticles"})
+              .Define("nhits",  nhits,      {"EcalBarrelHits"})
+              .Define("Esim",   Esim,       {"EcalBarrelHits"})
+              .Define("fsam",   fsam,       {"Esim","Ethr"})
+              .Define("pid",    getpid,     {"mcparticles"})
+              .Define("dau",    getdau,     {"mcparticles"})
+              ;
 
   // Define Histograms
   auto hEthr  = d1.Histo1D({"hEthr",  "Thrown Energy; Thrown Energy [GeV]; Events",        100,  0.0,    7.5}, "Ethr");
   auto hNhits = d1.Histo1D({"hNhits", "Number of hits per events; Number of hits; Events", 100,  0.0, 2000.0}, "nhits");
   auto hEsim  = d1.Histo1D({"hEsim",  "Energy Deposit; Energy Deposit [GeV]; Events",      100,  0.0,    1.0}, "Esim");
   auto hfsam  = d1.Histo1D({"hfsam",  "Sampling Fraction; Sampling Fraction; Events",      100,  0.0,    0.1}, "fsam");
+  auto hpid   = d1.Histo1D({"hpid",   "PID; PID; Count",                                   100,  -220,   220}, "pid");
+  auto hdau   = d1.Histo1D({"hdau",   "Number of Daughters; Number of Daughters; Count",   10,   0,      10},  "dau");
+
+  // Set sampling Fraction, ideally this will be taken from a json file 
+  samp_frac = hfsam -> GetMean();
+
+  auto d2 = d1.Define("dE",     eResol,     {"Esim","Ethr"})
+              .Define("dE_rel", eResol_rel, {"Esim","Ethr"})
+              ;
 
   // Event Counts
   auto nevents_thrown      = d1.Count();
@@ -121,4 +193,61 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
   hfsam->DrawClone();
   c4->SaveAs("results/emcal_barrel_pions_fsam.png");
   c4->SaveAs("results/emcal_barrel_pions_fsam.pdf");
+
+  TCanvas *c5 = new TCanvas("c5", "c5", 700, 500);
+  c5->SetLogy(1);
+  hpid->GetYaxis()->SetTitleOffset(1.4);
+  hpid->SetLineWidth(2);
+  hpid->SetLineColor(kBlue);
+  hpid->DrawClone();
+  c5->SaveAs("results/emcal_barrel_pions_pid.png");
+  c5->SaveAs("results/emcal_barrel_pions_pid.pdf");
+
+  TCanvas *c6 = new TCanvas("c6", "c6", 700, 500);
+  c5->SetLogy(1);
+  hdau->GetYaxis()->SetTitleOffset(1.4);
+  hdau->SetLineWidth(2);
+  hdau->SetLineColor(kBlue);
+  hdau->DrawClone();
+  c6->SaveAs("results/emcal_barrel_pions_dau.png");
+  c6->SaveAs("results/emcal_barrel_pions_dau.pdf");
+
+  //Energy Resolution Calculation
+  auto hdE          = d2.Histo1D({"hdE",      "dE; dE[GeV]; Events",              100, -3.0, 3.0}, "dE");
+  auto hdE_rel      = d2.Histo1D({"hdE_rel",  "dE Relative; dE Relative; Events", 100, -3.0, 3.0}, "dE_rel");
+  hdE->Fit("gaus", "", "", -3.0,  3.0);
+  double* res       = hdE->GetFunction("gaus")->GetParameters();
+  double sigmaOverE = res[2] / thrown_energy;
+
+  //Pass/Fail
+  if (sigmaOverE <= resolutionTarget) {
+    pi0_energy_resolution.pass(sigmaOverE);
+  } else {
+    pi0_energy_resolution.fail(sigmaOverE);
+  }
+  //std::printf("Energy Resolution is %f\n", res[2]);
+
+  //Energy Resolution Histogram Plotting
+  auto *cdE = new TCanvas("cdE", "cdE", 700, 500);
+  cdE->SetLogy(1);
+  hdE->GetYaxis()->SetTitleOffset(1.4);
+  hdE->SetLineWidth(2);
+  hdE->SetLineColor(kBlue);
+  hdE->GetFunction("gaus")->SetLineWidth(2);
+  hdE->GetFunction("gaus")->SetLineColor(kRed);
+  hdE->DrawClone();
+  cdE->SaveAs("results/emcal_barrel_pi0_dE.png");
+  cdE->SaveAs("results/emcal_barrel_pi0_dE.pdf");
+
+  auto *cdE_rel = new TCanvas("cdE_rel", "cdE_rel", 700, 500);
+  hdE_rel->GetYaxis()->SetTitleOffset(1.4);
+  hdE_rel->SetLineWidth(2);
+  hdE_rel->SetLineColor(kBlue);
+  hdE_rel->DrawClone();
+  cdE_rel->SaveAs("results/emcal_barrel_pi0_dE_rel.png");
+  cdE_rel->SaveAs("results/emcal_barrel_pi0_dE_rel.pdf");
+
+  eic::util::write_test({pi0_energy_resolution}, fmt::format("{}_pions.json", detector));
+
+
 }