separate la and anti-la cases in cascade building

Author: jesgum

ALICE3/TableProducer/alice3strangenessFinder.cxx

@@ -296,7 +296,13 @@ struct Alice3strangenessFinder {
                                                                    std::array{v0cand.pDau1[0], v0cand.pDau1[1], v0cand.pDau1[2]}},
                                                         std::array{o2::constants::physics::MassProton, o2::constants::physics::MassPionCharged});
 
-        if (std::abs(lambdaMassHypothesis - o2::constants::physics::MassLambda0) > acceptedLambdaMassWindow) {
+        const float antiLambdaMassHypothesis = RecoDecay::m(std::array{std::array{v0cand.pDau0[0], v0cand.pDau0[1], v0cand.pDau0[2]},
+                                                                       std::array{v0cand.pDau1[0], v0cand.pDau1[1], v0cand.pDau1[2]}},
+                                                            std::array{o2::constants::physics::MassPionCharged, o2::constants::physics::MassProton});
+
+        const bool inLambdaMassWindow = std::abs(lambdaMassHypothesis - o2::constants::physics::MassLambda0) > acceptedLambdaMassWindow;
+        const bool inAntiLambdaMassWindow = std::abs(antiLambdaMassHypothesis - o2::constants::physics::MassLambda0) > acceptedLambdaMassWindow;
+        if (inLambdaMassWindow || inAntiLambdaMassWindow) {
           continue; // Likely not a lambda, should not be considered for cascade building
         }
 
@@ -305,6 +311,14 @@ struct Alice3strangenessFinder {
             continue; // avoid using any track that was already used
           }
 
+          if (inLambdaMassWindow && bachTrack.sign() > 0) {
+            continue; // only consider lambda and neg bach track
+          }
+
+          if (inAntiLambdaMassWindow && bachTrack.sign() < 0) {
+            continue; // only consider anti-lambda and pos bach track
+          }
+
           // TODO mc same mother check
 
           Candidate cascCand;