Add JJ config for gap 3 test production (#2289)

* Fix typo in comment

* Add JJ config for gap 3 test production

Author: raymondEhlers

MC/config/PWGGAJE/ini/GeneratorJE_gapgen3_hook_pp5360GeV.ini

@@ -0,0 +1,9 @@
+### jet-jet production with MB Gap 3 for pp anchored to Pb-Pb periods
+### The external generator derives from GeneratorPythia8.
+[GeneratorExternal]
+fileName = ${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGGAJE/external/generator/generator_pythia8_gaptrigger_jets_hook.C
+funcName = getGeneratorPythia8GapGenJE(3,"${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGGAJE/pythia8/generator/pythia8_minbias_pp5360GeV.cfg","${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGGAJE/pythia8/generator/pythia8_jet_pp5360GeV.cfg")
+
+[GeneratorPythia8]
+config=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGGAJE/pythia8/generator/pythia8_jet_pp5360GeV.cfg
+includePartonEvent=true

MC/config/PWGGAJE/ini/tests/GeneratorJE_gapgen2_hook_pp13600GeV.C

@@ -1,7 +1,7 @@
 int External() {
     std::string path{"o2sim_Kine.root"};
 
-    float ratioTrigger = 1./2; // one event triggered out of 5
+    float ratioTrigger = 1./2; // one event triggered out of 2
 
 
     TFile file(path.c_str(), "READ");

MC/config/PWGGAJE/ini/tests/GeneratorJE_gapgen3_hook_pp5360GeV.C

@@ -0,0 +1,71 @@
+int External() {
+    std::string path{"o2sim_Kine.root"};
+
+    float ratioTrigger = 1./3; // one event triggered out of 3
+
+
+    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");
+    std::vector<o2::MCTrack> *tracks{};
+    tree->SetBranchAddress("MCTrack", &tracks);
+    o2::dataformats::MCEventHeader *eventHeader = nullptr;
+    tree->SetBranchAddress("MCEventHeader.", &eventHeader);
+
+    int nEventsMB{}, nEventsJetJet{};
+    float sumWeightsMB{}, sumWeightsJetJet{};
+    int sumTracks{};
+    auto nEvents = tree->GetEntries();
+
+    for (int i = 0; i < nEvents; i++) {
+        tree->GetEntry(i);
+
+        // check subgenerator information and event weights
+        if (eventHeader->hasInfo(o2::mcgenid::GeneratorProperty::SUBGENERATORID)) {
+            bool isValid = false;
+            int subGeneratorId = eventHeader->getInfo<int>(o2::mcgenid::GeneratorProperty::SUBGENERATORID, isValid);
+            if (eventHeader->hasInfo(o2::dataformats::MCInfoKeys::weight)) {
+                float weight = eventHeader->getInfo<float>(o2::dataformats::MCInfoKeys::weight,isValid);
+                if (subGeneratorId == 0) {
+                    nEventsMB++;
+                    sumWeightsMB += weight;
+                } 
+                else if (subGeneratorId == 1) {
+                    nEventsJetJet++;
+                    sumWeightsJetJet += weight;
+                }
+            }
+        }
+        sumTracks += tracks->size();
+    }
+
+    std::cout << "--------------------------------\n";
+    std::cout << "# Events: " << nEvents << "\n";
+    std::cout << "# MB events: " << nEventsMB << "\n";
+    std::cout << "  sum of weights for MB events: " << sumWeightsMB << "\n";
+    std::cout << "# Jet-jet events " << nEventsJetJet << "\n";
+    std::cout << "  sum of weights jet-jet events: " << sumWeightsJetJet << "\n";
+    std::cout << "# tracks summed over all events (jet-jet + MB): " << sumTracks << "\n";
+
+    if (nEventsMB < nEvents * (1 - ratioTrigger) * 0.95 || nEventsMB > nEvents * (1 - ratioTrigger) * 1.05) { // we put some tolerance since the number of generated events is small
+        std::cerr << "Number of generated MB events different than expected\n";
+        return 1;
+    }
+    if (nEventsJetJet < nEvents * ratioTrigger * 0.95 || nEventsJetJet > nEvents * ratioTrigger * 1.05) {
+        std::cerr << "Number of jet-jet generated events different than expected\n";
+        return 1;
+    }
+    if(nEventsMB < sumWeightsMB * 0.95 || nEventsMB > sumWeightsMB * 1.05) {
+        std::cerr << "Weights of MB events do not = 1 as expected\n";
+        return 1;
+    }
+    if(sumTracks < 1) {
+        std::cerr << "No tracks in simulated events\n";
+        return 1;
+    }
+    return 0;
+}