[PWGCF] FemtoUniverse cascade task -- implemented pair cleaner for cascade-cascade combination (#9449)

Co-authored-by: Shirajum Monira <shirajum.monira@cernch>

Author: Eloviyo

PWGCF/FemtoUniverse/Core/FemtoUniversePairCleaner.h

@@ -14,6 +14,7 @@
 /// \author Andi Mathis, TU München, andreas.mathis@ph.tum.de
 /// \author Laura Serksnyte, TU München,laura.serksnyte@cern.ch
 /// \author Zuzanna Chochulska, WUT Warsaw & CTU Prague, zchochul@cern.ch
+/// \author Shirajum Monira, WUT Warsaw, shirajum.monira@cern.ch
 
 #ifndef PWGCF_FEMTOUNIVERSE_CORE_FEMTOUNIVERSEPAIRCLEANER_H_
 #define PWGCF_FEMTOUNIVERSE_CORE_FEMTOUNIVERSEPAIRCLEANER_H_
@@ -112,6 +113,24 @@ class FemtoUniversePairCleaner
         return false;
       }
       return part1.globalIndex() != part2.globalIndex();
+    } else if constexpr (kPartOneType == o2::aod::femtouniverseparticle::ParticleType::kCascade && kPartTwoType == o2::aod::femtouniverseparticle::ParticleType::kCascade) {
+      /// Cascade-Cascade combination both part1 and part2 are cascades
+      if (part1.partType() != o2::aod::femtouniverseparticle::ParticleType::kCascade || part2.partType() != o2::aod::femtouniverseparticle::ParticleType::kCascade) {
+        LOG(fatal) << "FemtoUniversePairCleaner: passed arguments don't agree with FemtoUniversePairCleaner instantiation! Please provide first and second arguments kCascade candidate.";
+        return false;
+      }
+      // Getting cascade children for part1
+      const auto& posChild1 = particles.iteratorAt(part1.index() - 3);
+      const auto& negChild1 = particles.iteratorAt(part1.index() - 2);
+      const auto& bachelor1 = particles.iteratorAt(part1.index() - 1);
+      // Getting cascade children for part2
+      const auto& posChild2 = particles.iteratorAt(part2.index() - 3);
+      const auto& negChild2 = particles.iteratorAt(part2.index() - 2);
+      const auto& bachelor2 = particles.iteratorAt(part2.index() - 1);
+      if (posChild1.globalIndex() == posChild2.globalIndex() || negChild1.globalIndex() == negChild2.globalIndex() || bachelor1.globalIndex() == bachelor2.globalIndex()) {
+        return false;
+      }
+      return part1.globalIndex() != part2.globalIndex();
     } else if constexpr (kPartOneType == o2::aod::femtouniverseparticle::ParticleType::kTrack && kPartTwoType == o2::aod::femtouniverseparticle::ParticleType::kD0) {
       /// Track-D0 combination part1 is hadron and part2 is D0
       if (part2.partType() != o2::aod::femtouniverseparticle::ParticleType::kD0) {

PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackCascadeExtended.cxx

@@ -112,6 +112,7 @@ struct femtoUniversePairTaskTrackCascadeExtended { // o2-linter: disable=name/st
   FemtoUniverseContainer<femto_universe_container::EventType::same, femto_universe_container::Observable::kstar> sameEventCont;
   FemtoUniverseContainer<femto_universe_container::EventType::mixed, femto_universe_container::Observable::kstar> mixedEventCont;
   FemtoUniversePairCleaner<aod::femtouniverseparticle::ParticleType::kTrack, aod::femtouniverseparticle::ParticleType::kCascade> pairCleaner;
+  FemtoUniversePairCleaner<aod::femtouniverseparticle::ParticleType::kCascade, aod::femtouniverseparticle::ParticleType::kCascade> pairCleanerCasc;
 
   HistogramRegistry rXiQA{"xi", {}, OutputObjHandlingPolicy::AnalysisObject, true, true};
   HistogramRegistry qaRegistry{"TrackQA", {}, OutputObjHandlingPolicy::AnalysisObject};
@@ -379,7 +380,7 @@ struct femtoUniversePairTaskTrackCascadeExtended { // o2-linter: disable=name/st
       if (!invMCascade(p2.mLambda(), p2.mAntiLambda()))
         return;
       // track cleaning
-      if (!pairCleaner.isCleanPair(p1, p2, parts)) {
+      if (!pairCleanerCasc.isCleanPair(p1, p2, parts)) {
         return;
       }
       const auto& posChild1 = parts.iteratorAt(p1.index() - 3);
@@ -488,7 +489,7 @@ struct femtoUniversePairTaskTrackCascadeExtended { // o2-linter: disable=name/st
         if (!isParticleTPC(posChild2, CascChildTable[confCascType2][0]) || !isParticleTPC(negChild2, CascChildTable[confCascType2][1]) || !isParticleTPC(bachelor2, CascChildTable[confCascType2][2]))
           return;
         // track cleaning
-        if (!pairCleaner.isCleanPair(p1, p2, parts)) {
+        if (!pairCleanerCasc.isCleanPair(p1, p2, parts)) {
           continue;
         }