Resolve "pi0 resolution for ECal barrel"

Closes #19 (closed)

benchmarks/barrel_ecal/scripts/emcal_barrel_pions_analysis.cxx

@@ -120,12 +120,21 @@ void emcal_barrel_pions_analysis(const char* input_fname = "sim_output/sim_emcal
     return input[2].pdgID;
   };
 
+  // Returns the pdgID of the particle daughters(hopefully?)
+  auto getdau = [](std::vector<dd4pod::Geant4ParticleData> const& input) {
+    std::vector<double> result;
+    for (auto part : input[2].daughters_begin)
+      result.push_back(*part)
+    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("pid",    getpid,     {"mcparticles"})
+              .Define("dau",    getdau,     {"mcparticles"})
               ;
 
   // Define Histograms
@@ -134,6 +143,7 @@ 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 hpid2  = d1.Histo1D({"hpid2",   "PID; PID; Count",                                  100,  -220,   220}, "dau");
 
   // Set sampling Fraction, ideally this will be taken from a json file 
   cout << "The sampling fraction mean is " << samp_frac << endl;
@@ -199,6 +209,15 @@ 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);
+  hpid2->GetYaxis()->SetTitleOffset(1.4);
+  hpid2->SetLineWidth(2);
+  hpid2->SetLineColor(kBlue);
+  hpid2->DrawClone();
+  c6->SaveAs("results/emcal_barrel_pions_pid2.png");
+  c6->SaveAs("results/emcal_barrel_pions_pid2.pdf");
+
   //Energy Resolution Calculation
   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