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 <detector_benchmarks/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;
@@ -32,6 +37,20 @@ 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";
+  double resolutionTarget = 0.1;
+  /*
+  eic::util::Test pion0_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);
 
@@ -65,11 +84,25 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
     return result;
   };
 
+  // Sampling fraction = Esampling / Ethrown, revised
+  auto fsam2 = [](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 / *it_thr);
+    }
+    return result;
+  };
+
   // Define variables
   auto d1 = d0.Define("Ethr",  Ethr,  {"mcparticles"})
 	      .Define("nhits", nhits, {"EcalBarrelHits"})
 	      .Define("Esim",  Esim,  {"EcalBarrelHits"})
-	      .Define("fsam",  fsam,  {"Esim","Ethr"})
+	      //.Define("fsam",  fsam,  {"Esim","Ethr"})
+        .Define("fsam",  fsam2,  {"Esim","Ethr"})
+        .Define("dE", "Ethr-Esim")
+        .Define("dE_rel", "(Ethr - Esim)/Esim")
 	      ;
 
   // Define Histograms
@@ -121,4 +154,47 @@ 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");
+
+  //Energy Resolution Work
+  auto hdE          = d1.Histo1D({"hdE",      "dE; dE[GeV]; Events",              100, -7.5, 7.5}, "dE");
+  auto hdE_rel      = d1.Histo1D({"hdE_rel",  "dE Relative; dE Relative; Events", 100, -7.5, 7.5}, "dE_rel");
+  TFitResultPtr f1  = hdE_rel->Fit("gaus", "S");
+  const double* res = f1->GetParams();
+  auto tf1          = new TF1("", "TMath::Gaus(x, [0], [1], [2])", -7.5, 7.5);
+  tf1               -> SetParameters(res[0], res[1], res[2]); 
+
+  //Pass/Fail
+  /*
+  if (res[2] <= resolutionTarget) {
+    pion0_energy_resolution.pass(res[2]);
+  } else {
+    pion0_energy_resolution.fail(res[2]);
+  }
+  */
+  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->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);
+  tf1->SetLineWidth(2);
+  tf1->SetLineColor(kRed);
+  hdE_rel->DrawClone();
+  tf1->Draw("SAME");
+  cdE_rel->SaveAs("results/emcal_barrel_pi0_dE_rel.png");
+  cdE_rel->SaveAs("results/emcal_barrel_pi0_dE_rel.pdf");
+
+  //eic::util::write_test({pion0_energy_resolution}, fmt::format("{}_pions.json", detector));
+
+
 }