PWGHF: add TF border cut at the particle generate level

Author: Luigi Dello Stritto

PWGHF/TableProducer/candidateCreator3Prong.cxx

@@ -476,6 +476,9 @@ struct HfCandidateCreator3ProngExpressions {
   bool createLc{false};
   bool createXic{false};
   float zPvPosMax{1000.f};
+  float useTimeFrameBorderCut{false};
+
+  using BCsInfo = soa::Join<aod::BCs, aod::Timestamps, aod::BcSels>;
 
   void init(InitContext& initContext)
   {
@@ -495,6 +498,8 @@ struct HfCandidateCreator3ProngExpressions {
             createXic = option.defaultValue.get<bool>();
           } else if (option.name.compare("zPvPosMax") == 0) {
             zPvPosMax = option.defaultValue.get<float>();
+          } else if (option.name.compare("useTimeFrameBorderCut") == 0) {
+            useTimeFrameBorderCut = option.defaultValue.get<bool>();
           }
         }
         break;
@@ -511,7 +516,8 @@ struct HfCandidateCreator3ProngExpressions {
   /// Performs MC matching.
   void processMc(aod::TracksWMc const& tracks,
                  aod::McParticles const& mcParticles,
-                 aod::McCollisions const&)
+                 aod::McCollisions const&,
+                 BCsInfo const&)
   {
     rowCandidateProng3->bindExternalIndices(&tracks);
 
@@ -635,6 +641,14 @@ struct HfCandidateCreator3ProngExpressions {
         continue;
       }
 
+      if (useTimeFrameBorderCut) { // accept only mc particles coming from bc that are far away from TF border and ITSROFrame
+        auto bc = mcCollision.bc_as<BCsInfo>();
+        if (!bc.selection_bit(o2::aod::evsel::kNoITSROFrameBorder) || !bc.selection_bit(o2::aod::evsel::kNoTimeFrameBorder)) {
+          rowMcMatchGen(flag, origin, channel);
+          continue;
+        }
+      }
+
       // D± → π± K∓ π±
       if (createDplus) {
         if (RecoDecay::isMatchedMCGen(mcParticles, particle, Pdg::kDPlus, std::array{+kPiPlus, -kKPlus, +kPiPlus}, true, &sign, 2)) {