[PWGHF] Fix filling of MC collision info in OmegaC creator

Author: fcatalan92

PWGHF/TableProducer/candidateCreatorXic0Omegac0.cxx

@@ -2726,18 +2726,22 @@ struct HfCandidateCreatorXic0Omegac0Mc {
       const auto mcParticlesPerMcColl = mcParticles.sliceBy(mcParticlesPerMcCollision, mcCollision.globalIndex());
       // Slice the collisions table to get the collision info for the current MC collision
       float centrality{-1.f};
-      uint16_t rejectionMask{0};
+      uint32_t rejectionMask{0u};
+      int nSplitColl = 0;
       if constexpr (centEstimator == CentralityEstimator::FT0C) {
         const auto collSlice = collsWithMcLabels.sliceBy(colPerMcCollisionFT0C, mcCollision.globalIndex());
         rejectionMask = hfEvSelMc.getHfMcCollisionRejectionMask<BCsInfo, centEstimator>(mcCollision, collSlice, centrality);
+        nSplitColl = collSlice.size();
       } else if constexpr (centEstimator == CentralityEstimator::FT0M) {
         const auto collSlice = collsWithMcLabels.sliceBy(colPerMcCollisionFT0M, mcCollision.globalIndex());
         rejectionMask = hfEvSelMc.getHfMcCollisionRejectionMask<BCsInfo, centEstimator>(mcCollision, collSlice, centrality);
+        nSplitColl = collSlice.size();
       } else if constexpr (centEstimator == CentralityEstimator::None) {
         const auto collSlice = collsWithMcLabels.sliceBy(colPerMcCollision, mcCollision.globalIndex());
         rejectionMask = hfEvSelMc.getHfMcCollisionRejectionMask<BCsInfo, centEstimator>(mcCollision, collSlice, centrality);
+        nSplitColl = collSlice.size();
       }
-      hfEvSelMc.fillHistograms<centEstimator>(mcCollision, rejectionMask);
+      hfEvSelMc.fillHistograms<centEstimator>(mcCollision, rejectionMask, nSplitColl);
       if (rejectionMask != 0) {
         /// at least one event selection not satisfied --> reject all particles from this collision
         for (unsigned int i = 0; i < mcParticlesPerMcColl.size(); ++i) {