Resolve "pi0 resolution for ECal barrel"

Closes #19 (closed)

benchmarks/barrel_ecal/scripts/emcal_barrel_pions_analysis.cxx

@@ -41,7 +41,8 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
   std::string test_tag = "Barrel_emcal_pi0";
   //TODO: Change test_tag to something else
   std:string detector = "Barrel_emcal";
-  //Energy resolution in teh barrel region(-1 < eta < 1)
+  // 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
@@ -120,12 +121,18 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
     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"})
               .Define("pid",    getpid,     {"mcparticles"})
+              .Define("dau",    getdau,     {"mcparticles"})
               ;
 
   // Define Histograms
@@ -134,18 +141,15 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
   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 
-  cout << "The sampling fraction mean is " << samp_frac << endl;
   samp_frac = hfsam -> GetMean();
-  cout << "The sampling fraction mean is " << samp_frac << endl;
 
   auto d2 = d1.Define("dE",     eResol,     {"Esim","Ethr"})
               .Define("dE_rel", eResol_rel, {"Esim","Ethr"})
               ;
 
-
-
   // Event Counts
   auto nevents_thrown      = d1.Count();
   std::cout << "Number of Thrown Events: " << (*nevents_thrown) << "\n";
@@ -199,10 +203,19 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
   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",              20, -7.5, 7.5}, "dE");//changed from 100
-  auto hdE_rel      = d2.Histo1D({"hdE_rel",  "dE Relative; dE Relative; Events", 20, -2, 2}, "dE_rel");//changed from 100
-  hdE->Fit("gaus", "", "", -2,  2);
+  auto hdE          = d2.Histo1D({"hdE",      "dE; dE[GeV]; Events",              20, -2.5, 2.5}, "dE");//changed from 100
+  auto hdE_rel      = d2.Histo1D({"hdE_rel",  "dE Relative; dE Relative; Events", 20, -2.5, 2.5}, "dE_rel");//changed from 100
+  hdE->Fit("gaus", "", "", -2.5,  2.5);
   double* res       = hdE->GetFunction("gaus")->GetParameters();
   double sigmaOverE = res[2] / thrown_energy;
 
@@ -231,8 +244,6 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
   hdE_rel->GetYaxis()->SetTitleOffset(1.4);
   hdE_rel->SetLineWidth(2);
   hdE_rel->SetLineColor(kBlue);
-  hdE_rel->GetFunction("gaus")->SetLineWidth(2);
-  hdE_rel->GetFunction("gaus")->SetLineColor(kRed);
   hdE_rel->DrawClone();
   cdE_rel->SaveAs("results/emcal_barrel_pi0_dE_rel.png");
   cdE_rel->SaveAs("results/emcal_barrel_pi0_dE_rel.pdf");