From 8646f4eccdbbc1904581174a5fa774ea8946d254 Mon Sep 17 00:00:00 2001
From: Jonathan Witte <Jonathan.Witte@gmx.net>
Date: Fri, 30 Oct 2026 13:00:35 +0100
Subject: [PATCH] Reset and fill the event properties in the runMCGen

---
 PWGDQ/Tasks/dqEfficiency_withAssoc.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/PWGDQ/Tasks/dqEfficiency_withAssoc.cxx b/PWGDQ/Tasks/dqEfficiency_withAssoc.cxx
index 176d7ce64b2..e306675dc4a 100644
--- a/PWGDQ/Tasks/dqEfficiency_withAssoc.cxx
+++ b/PWGDQ/Tasks/dqEfficiency_withAssoc.cxx
@@ -2638,6 +2638,11 @@ struct AnalysisSameEventPairing {
       if (!event.has_reducedMCevent()) {
         continue;
       }
+      // Fill the event-wise variables (e.g. centrality) of this reconstructed event, otherwise the generated particles and pairs
+      // get the values left over from the last event processed in runSameEventPairing
+      VarManager::ResetValues(0, VarManager::kNVars);
+      VarManager::FillEvent<gkEventFillMap>(event, dqefficiency_helpers::varValues());
+      VarManager::FillEvent<VarManager::ObjTypes::ReducedEventMC>(event.reducedMCevent(), dqefficiency_helpers::varValues());
 
       FinalStateMcParticleIndices.clear();