[PWGCF] Changed the Partition to slice by MC collision index (#10935)

JStaa · alibuild · web-flow · commit 00dbad6fe8b3 · 2025-04-22T23:28:35.000+02:00
Co-authored-by: ALICE Action Bot &lt;alibuild@cern.ch&gt;
diff --git a/PWGCF/MultiparticleCorrelations/Tasks/threeParticleCorrelations.cxx b/PWGCF/MultiparticleCorrelations/Tasks/threeParticleCorrelations.cxx
@@ -470,11 +470,13 @@ struct ThreeParticleCorrelations {
     // End of the MC Mixed-events Correlations
   }
 
-  void processMCGen(MyFilteredMCGenCollision const&, MyFilteredMCParticles const&)
+  void processMCGen(MyFilteredMCGenCollision const& collision, MyFilteredMCParticles const&)
   {
 
+    auto groupMCParticles = mcParticles->sliceByCached(aod::mcparticle::mcCollisionId, collision.globalIndex(), cache);
+
     // Start of the Monte-Carlo generated QA
-    for (const auto& particle : mcParticles) {
+    for (const auto& particle : groupMCParticles) {
       if (particle.isPhysicalPrimary()) {
 
         // Efficiency - Generated

Original file line number	Diff line number	Diff line change
`@@ -470,11 +470,13 @@ struct ThreeParticleCorrelations {`
`470`	`470`	`// End of the MC Mixed-events Correlations`
`471`	`471`	`}`
`472`	`472`
`473`		`- void processMCGen(MyFilteredMCGenCollision const&, MyFilteredMCParticles const&)`
	`473`	`+ void processMCGen(MyFilteredMCGenCollision const& collision, MyFilteredMCParticles const&)`
`474`	`474`	`{`
`475`	`475`
	`476`	`+ auto groupMCParticles = mcParticles->sliceByCached(aod::mcparticle::mcCollisionId, collision.globalIndex(), cache);`
	`477`	`+`
`476`	`478`	`// Start of the Monte-Carlo generated QA`
`477`		`- for (const auto& particle : mcParticles) {`
	`479`	`+ for (const auto& particle : groupMCParticles) {`
`478`	`480`	`if (particle.isPhysicalPrimary()) {`
`479`	`481`
`480`	`482`	`// Efficiency - Generated`