update for generating a cocktail of X3872 + Psi2S to Jpsi pi pi (#1860)

MC/config/PWGDQ/EvtGen/DecayTablesEvtgen/X3872ANDPSI2STOJPSIPIPI.DEC

@@ -0,0 +1,15 @@
+Decay X_1(3872)
+#### Breit-Wigner function for the pion distribution (S-Wave approximation)
+1.000 J/psi   pi+     pi-         XJPSIRHO0PIPI_S;
+Enddecay
+
+Decay psi(2S)
+1.000 J/psi   pi+     pi-         VVPIPI;
+Enddecay
+
+Decay J/psi
+### from DECAY.DEC
+1.000 	e+   	e-                PHOTOS VLL;
+Enddecay
+
+End

MC/config/PWGDQ/external/generator/GeneratorPromptCharmonia.C

@@ -962,5 +962,30 @@ FairGenerator*
 }
 
 
+FairGenerator* GeneratorCocktailX3872AndPsi2StoJpsi_pp13TeV()
+{
+  auto genCocktailEvtGen = new o2::eventgen::GeneratorEvtGen<GeneratorCocktail>();
+
+  auto genX3872 = new o2::eventgen::O2_GeneratorParamX3872MidY;
+  genX3872->SetNSignalPerEvent(1); // number of jpsis per event
+  auto genPsi2S = new o2::eventgen::O2_GeneratorParamPsiMidY;
+  genPsi2S->SetNSignalPerEvent(1); // number of jpsis per event
+  genCocktailEvtGen->AddGenerator(genX3872, 1); // add J/psi generator
+  genCocktailEvtGen->AddGenerator(genPsi2S, 1);  // add Psi(2S) generator
+
+  TString pdgs = "9920443;100443";
+  std::string spdg;
+  TObjArray* obj = pdgs.Tokenize(";");
+  genCocktailEvtGen->SetSizePdg(obj->GetEntriesFast());
+  for (int i = 0; i < obj->GetEntriesFast(); i++) {
+    spdg = obj->At(i)->GetName();
+    genCocktailEvtGen->AddPdg(std::stoi(spdg), i);
+    printf("PDG %d \n", std::stoi(spdg));
+  }
+  TString pathO2 = gSystem->ExpandPathName("${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGDQ/EvtGen/DecayTablesEvtgen");
+  genCocktailEvtGen->SetDecayTable(Form("%s/X3872ANDPSI2STOJPSIPIPI.DEC", pathO2.Data()));
+
+  return genCocktailEvtGen;
+}
 
 

MC/config/PWGDQ/external/generator/generator_pythia8_withInjectedPromptSignals_gaptriggered_dq.C

@@ -51,6 +51,9 @@ public:
       case 9: // generate prompt psi2S to Jpsi pi pi at midrapidity
         mGeneratorParam = (Generator*)GeneratorParamPromptPsiToJpsiPiPiEvtGen_pp13TeV("100443");
         break;
+      case 10: // generate cocktail of prompt X_1(3872) and psi2S to Jpsi pi pi at midrapidity
+        mGeneratorParam = (Generator*)GeneratorCocktailX3872AndPsi2StoJpsi_pp13TeV();
+        break; 
       }
     mGeneratorParam->Init();  
   }

MC/config/PWGDQ/ini/Generator_InjectedPromptX3782andPsi2SMidy_TriggerGap.ini

@@ -0,0 +1,6 @@
+### The external generator derives from GeneratorPythia8.
+[GeneratorExternal]
+fileName=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGDQ/external/generator/generator_pythia8_withInjectedPromptSignals_gaptriggered_dq.C
+funcName=GeneratorPythia8InjectedPromptCharmoniaGapTriggered(5,10)
+[GeneratorPythia8]
+config=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGDQ/pythia8/generator/pythia8_inel_triggerGap.cfg

MC/config/PWGDQ/ini/tests/Generator_InjectedPromptX3782andPsi2SMidy_TriggerGap.C

@@ -0,0 +1,104 @@
+int External()
+{
+    int checkPdgSignal[] = {9920443,100443}; // pdg code X3872
+    TString PdgSignalName[] = {"X(3872)", "Psi2S"};
+    int checkPdgDecay[] = {443, 211, -211}; 
+    int leptonPdg = 11;
+    Double_t rapidityWindow = 1.0;
+    std::string path{"o2sim_Kine.root"};
+    for(int iSig =0; iSig < 2; iSig++) std::cout << "Check for\nsignal PDG " << checkPdgSignal[iSig] << "\n decay PDG " << checkPdgDecay[0] << ", " << checkPdgDecay[1] << ", " << checkPdgDecay[2] << "\n";
+    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);
+
+    int nLeptons[]={0,0};
+    int nAntileptons[]={0,0};
+    int nLeptonPairs[]={0,0};
+    int nLeptonPairsToBeDone[]={0,0};
+    int nSignalX3872[]={0,0};
+    int nSignalPionsPos[]={0,0};
+    int nSignalPionsNeg[]={0,0};
+    int nSignalPsi2S{};
+    int nSignalX3872WithinAcc[]={0,0};
+    int nSignalPionsPosWithinAcc[]={0,0};
+    int nSignalPionsNegWithinAcc[]={0,0};
+    auto nEvents = tree->GetEntries();
+    o2::steer::MCKinematicsReader mcreader("o2sim", o2::steer::MCKinematicsReader::Mode::kMCKine);
+    Bool_t hasPsi2SMoth = kFALSE;
+
+    for (int i = 0; i < nEvents; i++) {
+        tree->GetEntry(i);
+        for (auto& track : *tracks) {
+            auto pdg = track.GetPdgCode();
+	    auto rapidity =  track.GetRapidity();
+	    auto idMoth = track.getMotherTrackId();
+	    int idX3872 = -1; int IdChild0 = -1; int IdChild1 = -1;
+	    for(int iSig=0; iSig<2; iSig++) { 
+            if (pdg == leptonPdg) {
+                // count leptons
+                nLeptons[iSig]++;
+            } else if(pdg == -leptonPdg) {
+                // count anti-leptons
+                nAntileptons[iSig]++;
+            } else if (pdg == checkPdgSignal[iSig]) {
+		 // check daughters
+                  std::cout << "Signal PDG: " << pdg << "\n";
+                  for (int j{track.getFirstDaughterTrackId()}; j <= track.getLastDaughterTrackId(); ++j) {
+                  auto pdgDau = tracks->at(j).GetPdgCode();
+                  std::cout << "Daughter " << j << " is: " << pdgDau << "\n";
+                    if(TMath::Abs(pdgDau) == checkPdgDecay[0] ) { nSignalX3872[iSig]++; if( std::abs(track.GetRapidity()) < rapidityWindow) nSignalX3872WithinAcc[iSig]++; idX3872 = j; }
+                    if(pdgDau == checkPdgDecay[1] ) { nSignalPionsPos[iSig]++; if( std::abs(track.GetRapidity()) < rapidityWindow) nSignalPionsPosWithinAcc[iSig]++; }
+                    if(pdgDau == checkPdgDecay[2] ) { nSignalPionsNeg[iSig]++; if( std::abs(track.GetRapidity()) < rapidityWindow) nSignalPionsNegWithinAcc[iSig]++; }
+		  }
+
+		  auto trackX3872 = tracks->at(idX3872);
+		  for (int j{trackX3872.getFirstDaughterTrackId()}; j <= trackX3872.getLastDaughterTrackId(); ++j) {
+                  auto pdgDau = tracks->at(j).GetPdgCode();
+		   if(pdgDau == leptonPdg ) IdChild0 = j;
+		   if(pdgDau == -leptonPdg ) IdChild1 = j;
+		  }
+         	auto child0 = tracks->at(IdChild0);
+         	auto child1 = tracks->at(IdChild1);
+                    // check for parent-child relations
+                    auto pdg0 = child0.GetPdgCode();
+                    auto pdg1 = child1.GetPdgCode();
+                    std::cout << "Lepton daughter particles of mother  " << trackX3872.GetPdgCode() << " are PDG0: " << pdg0 << " PDG1: " << pdg1 << "\n"; 
+                    if (std::abs(pdg0) == leptonPdg && std::abs(pdg1) == leptonPdg && pdg0 == -pdg1) {
+                        nLeptonPairs[iSig]++;
+                        if (child0.getToBeDone() && child1.getToBeDone()) {
+                            nLeptonPairsToBeDone[iSig]++;
+                        }
+                    }
+            }
+          }
+	}
+    }
+
+    std::cout << "#events: " << nEvents << "\n";
+    for(int iSig=0; iSig < 2; iSig++){
+	    std::cout << "#leptons from " << PdgSignalName[iSig]  << ": " << nLeptons[iSig] << "\n"
+              << "#antileptons from " << PdgSignalName[iSig]  << ": " << nAntileptons[iSig] << "\n"
+              << "#signal (jpsi <-" << PdgSignalName[iSig] <<"): " << nSignalX3872[iSig] << "; within acceptance (|y| < " << rapidityWindow << "): " << nSignalX3872WithinAcc[iSig] << "\n"
+              << "#signal (pi+ <-" << PdgSignalName[iSig] <<"): " << nSignalPionsPos[iSig] << "; within acceptance (|y| < " << rapidityWindow << "): " << nSignalPionsPosWithinAcc[iSig] << "\n"
+              << "#signal (pi- <-" << PdgSignalName[iSig] <<"): " << nSignalPionsNeg[iSig] << "; within acceptance (|y| < " << rapidityWindow << "): " << nSignalPionsNegWithinAcc[iSig] << "\n"
+              << "#lepton pairs from " << PdgSignalName[iSig] <<": " << nLeptonPairs[iSig] << "\n"
+              << "#lepton pairs to be done from " << PdgSignalName[iSig] <<": " << nLeptonPairs[iSig] << "\n";
+
+
+    if (nLeptonPairs[iSig] == 0 || nLeptons[iSig] == 0 || nAntileptons[iSig] == 0) {
+        std::cerr << "Number of leptons, number of anti-leptons as well as number of lepton pairs should all be greater than 1.\n";
+        return 1;
+    }
+    if (nLeptonPairs[iSig] != nLeptonPairsToBeDone[iSig]) {
+        std::cerr << "The number of lepton pairs should be the same as the number of lepton pairs which should be transported.\n";
+        return 1;
+    }
+
+    }
+    return 0;
+}