From 1d90366f5e3e809b7addb03831276086a55ffc58 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dawid=20Karpi=C5=84ski?= <dawid.karp@int.pl>
Date: Sun, 22 Jun 2025 10:53:17 +0200
Subject: [PATCH] fix: do swapping also for same particles

---
 .../Tasks/femtoUniversePairTaskTrackTrackExtended.cxx      | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackTrackExtended.cxx b/PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackTrackExtended.cxx
index 852fb802d68..06665491396 100644
--- a/PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackTrackExtended.cxx
+++ b/PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackTrackExtended.cxx
@@ -567,7 +567,12 @@ struct FemtoUniversePairTaskTrackTrackExtended {
           weight *= effCorrection.getWeight(ParticleNo::TWO, p2);
         }
 
-        sameEventCont.setPair<isMC>(p1, p2, multCol, twotracksconfigs.confUse3D, weight);
+        if (swpart)
+          sameEventCont.setPair<isMC>(p1, p2, multCol, twotracksconfigs.confUse3D, weight);
+        else
+          sameEventCont.setPair<isMC>(p2, p1, multCol, twotracksconfigs.confUse3D, weight);
+
+        swpart = !swpart;
       }
     }
   }