[PWGLF] Daughter particle tracks bug fixed (#13939)

Author: 5ub-Man

PWGLF/Tasks/Resonances/kstarqa.cxx

@@ -2512,22 +2512,25 @@ struct Kstarqa {
             rEventSelection.fill(HIST("recMCparticles"), 16.5);
 
             oldindex = mothertrack1.globalIndex();
-            if (track1.sign() * track2.sign() < 0) {
+            if (track1PDG == PDG_t::kPiPlus) {
+              daughter1 = ROOT::Math::PxPyPzMVector(track1.px(), track1.py(), track1.pz(), massPi);
+              daughter2 = ROOT::Math::PxPyPzMVector(track2.px(), track2.py(), track2.pz(), massKa);
+            } else if (track1PDG == PDG_t::kKPlus) {
               daughter1 = ROOT::Math::PxPyPzMVector(track1.px(), track1.py(), track1.pz(), massKa);
               daughter2 = ROOT::Math::PxPyPzMVector(track2.px(), track2.py(), track2.pz(), massPi);
-              mother = daughter1 + daughter2; // Kstar meson
-
-              hInvMass.fill(HIST("h2KstarRecpt2"), mothertrack1.pt(), multiplicity, std::sqrt(mothertrack1.e() * mothertrack1.e() - mothertrack1.p() * mothertrack1.p()));
-              hInvMass.fill(HIST("h2KstarRecptCalib2"), mothertrack1.pt(), multiplicityRec, std::sqrt(mothertrack1.e() * mothertrack1.e() - mothertrack1.p() * mothertrack1.p()));
+            }
+            mother = daughter1 + daughter2; // Kstar meson
 
-              if (applyRecMotherRapidity && mother.Rapidity() >= selectionConfig.rapidityMotherData) {
-                continue;
-              }
+            hInvMass.fill(HIST("h2KstarRecpt2"), mothertrack1.pt(), multiplicity, std::sqrt(mothertrack1.e() * mothertrack1.e() - mothertrack1.p() * mothertrack1.p()));
+            hInvMass.fill(HIST("h2KstarRecptCalib2"), mothertrack1.pt(), multiplicityRec, std::sqrt(mothertrack1.e() * mothertrack1.e() - mothertrack1.p() * mothertrack1.p()));
 
-              hInvMass.fill(HIST("h1KstarRecMass"), mother.M());
-              hInvMass.fill(HIST("h2KstarRecpt1"), mother.Pt(), multiplicity, mother.M());
-              hInvMass.fill(HIST("h2KstarRecptCalib1"), mother.Pt(), multiplicityRec, mother.M());
+            if (applyRecMotherRapidity && mother.Rapidity() >= selectionConfig.rapidityMotherData) {
+              continue;
             }
+
+            hInvMass.fill(HIST("h1KstarRecMass"), mother.M());
+            hInvMass.fill(HIST("h2KstarRecpt1"), mother.Pt(), multiplicity, mother.M());
+            hInvMass.fill(HIST("h2KstarRecptCalib1"), mother.Pt(), multiplicityRec, mother.M());
           }
         }
       }