[PWGLF] Fix MC information for primaries and secondaries (#11452)

Author: fmazzasc

PWGLF/TableProducer/Nuspex/nucleiSpectra.cxx

@@ -1017,16 +1017,15 @@ struct nucleiSpectra {
         if (pdg != nuclei::codes[iS]) {
           continue;
         }
-        uint16_t flags{kIsPhysicalPrimary};
-        if (particle.isPhysicalPrimary()) {
-          if (particle.y() > cfgCutRapidityMin && particle.y() < cfgCutRapidityMax) {
-            nuclei::hGenNuclei[iS][particle.pdgCode() < 0]->Fill(1., particle.pt());
-          }
+        if (particle.y() < cfgCutRapidityMin || particle.y() > cfgCutRapidityMax) {
+          continue;
         }
 
-        if (!isReconstructed[index] && (cfgTreeConfig->get(iS, 0u) || cfgTreeConfig->get(iS, 1u))) {
-          float absDecL = computeAbsoDecL(particle);
-          int motherPdgCode = 0;
+        uint16_t flags = 0;
+        int motherPdgCode = 0;
+        if (particle.isPhysicalPrimary()) {
+          flags |= kIsPhysicalPrimary;
+          nuclei::hGenNuclei[iS][particle.pdgCode() < 0]->Fill(1., particle.pt());
           if (particle.has_mothers()) {
             for (auto& motherparticle : particle.mothers_as<aod::McParticles>()) {
               if (std::find(nuclei::hfMothCodes.begin(), nuclei::hfMothCodes.end(), std::abs(motherparticle.pdgCode())) != nuclei::hfMothCodes.end()) {
@@ -1036,6 +1035,18 @@ struct nucleiSpectra {
               }
             }
           }
+        } else if (particle.has_mothers()) {
+          flags |= kIsSecondaryFromWeakDecay;
+          for (auto& motherparticle : particle.mothers_as<aod::McParticles>()) {
+            motherPdgCode = motherparticle.pdgCode();
+          }
+        } else {
+          flags |= kIsSecondaryFromMaterial;
+        }
+
+        if (!isReconstructed[index] && (cfgTreeConfig->get(iS, 0u) || cfgTreeConfig->get(iS, 1u))) {
+          float absDecL = computeAbsoDecL(particle);
+
           nucleiTableMC(999., 999., 999., 0., 0., 999., 999., 999., -1, -1, -1, -1, flags, 0, 0, 0, 0, 0, 0, particle.pt(), particle.eta(), particle.phi(), particle.pdgCode(), motherPdgCode, goodCollisions[particle.mcCollisionId()], absDecL);
         }
         break;