add GeneratorLnnPbPb.C

Author: mapalhares

MC/config/PWGLF/ini/tests/GeneratorLFLnnPbPb.C

@@ -0,0 +1,61 @@
+int External()
+{
+  std::string path{"o2sim_Kine.root"};
+  int numberOfInjectedSignalsPerEvent{10};
+  std::vector<int> injectedPDGs = {1010000030, -1010000030};
+
+  auto nInjection = injectedPDGs.size();
+
+  TFile file(path.c_str(), "READ");
+  if (file.IsZombie())
+  {
+    std::cerr << "Cannot open ROOT file " << path << "\n";
+    return 1;
+  }
+
+  auto tree = (TTree *)file.Get("o2sim");
+  if (!tree)
+  {
+    std::cerr << "Cannot find tree o2sim in file " << path << "\n";
+    return 1;
+  }
+  std::vector<o2::MCTrack> *tracks{};
+  tree->SetBranchAddress("MCTrack", &tracks);
+
+  std::vector<int> nSignal;
+  for (int i = 0; i < nInjection; i++)
+  {
+    nSignal.push_back(0);
+  }
+
+  auto nEvents = tree->GetEntries();
+  for (int i = 0; i < nEvents; i++)
+  {
+    auto check = tree->GetEntry(i);
+    for (int idxMCTrack = 0; idxMCTrack < tracks->size(); ++idxMCTrack)
+    {
+      auto track = tracks->at(idxMCTrack);
+      auto pdg = track.GetPdgCode();
+      auto it = std::find(injectedPDGs.begin(), injectedPDGs.end(), pdg);
+      int index = std::distance(injectedPDGs.begin(), it); // index of injected PDG
+      if (it != injectedPDGs.end())                        // found
+      {
+        // count signal PDG
+        nSignal[index]++;
+      }
+    }
+  }
+  std::cout << "--------------------------------\n";
+  std::cout << "# Events: " << nEvents << "\n";
+  for (int i = 0; i < nInjection; i++)
+  {
+    std::cout << "# Injected nuclei \n";
+    std::cout << injectedPDGs[i] << ": " << nSignal[i] << "\n";
+    if (nSignal[i] == 0)
+    {
+      std::cerr << "No generated: " << injectedPDGs[i] << "\n";
+      return 1; // At least one of the injected particles should be generated
+    }
+  }
+  return 0;
+}