[PWGDQ] Adding charge information to minitree (#10236)

Co-authored-by: Lucamicheletti93 <luca.mike93@gmail.com>

Author: lucamicheletti93

PWGDQ/Core/VarManager.h

@@ -2746,6 +2746,22 @@ void VarManager::FillPair(T1 const& t1, T2 const& t2, float* values)
   double Ptot2 = TMath::Sqrt(v2.Px() * v2.Px() + v2.Py() * v2.Py() + v2.Pz() * v2.Pz());
   values[kDeltaPtotTracks] = Ptot1 - Ptot2;
 
+  if (t1.sign() > 0) {
+    values[kPt1] = t1.pt();
+    values[kEta1] = t1.eta();
+    values[kPhi1] = t1.phi();
+    values[kPt2] = t2.pt();
+    values[kEta2] = t2.eta();
+    values[kPhi2] = t2.phi();
+  } else {
+    values[kPt1] = t2.pt();
+    values[kEta1] = t2.eta();
+    values[kPhi1] = t2.phi();
+    values[kPt2] = t1.pt();
+    values[kEta2] = t1.eta();
+    values[kPhi2] = t1.phi();
+  }
+
   if (fgUsedVars[kDeltaPhiPair2]) {
     double phipair2 = v1.Phi() - v2.Phi();
     if (phipair2 > 3 * TMath::Pi() / 2) {

PWGDQ/Tasks/tableReader.cxx

@@ -1442,19 +1442,20 @@ struct AnalysisSameEventPairing {
               fHistMan->FillHistClass(Form("%s_unambiguous", histNames[iCut][0].Data()), VarManager::fgValues);
             }
             if (useMiniTree.fConfigMiniTree) {
+              // By default (kPt1, kEta1, kPhi1) are for the positive charge
               float dileptonMass = VarManager::fgValues[VarManager::kMass];
               if (dileptonMass > useMiniTree.fConfigMiniTreeMinMass && dileptonMass < useMiniTree.fConfigMiniTreeMaxMass) {
                 dileptonMiniTree(VarManager::fgValues[VarManager::kMass],
                                  VarManager::fgValues[VarManager::kPt],
                                  VarManager::fgValues[VarManager::kRap],
                                  VarManager::fgValues[VarManager::kCentFT0C],
                                  VarManager::fgValues[VarManager::kCos2DeltaPhi],
-                                 t1.pt(),
-                                 t1.eta(),
-                                 t1.phi(),
-                                 t2.pt(),
-                                 t2.eta(),
-                                 t2.phi());
+                                 VarManager::fgValues[VarManager::kPt1],
+                                 VarManager::fgValues[VarManager::kEta1],
+                                 VarManager::fgValues[VarManager::kPhi1],
+                                 VarManager::fgValues[VarManager::kPt2],
+                                 VarManager::fgValues[VarManager::kEta2],
+                                 VarManager::fgValues[VarManager::kPhi2]);
               }
             }
           } else {