From d17b154decff008008cbb7970a9f4d1ead9b3a84 Mon Sep 17 00:00:00 2001
From: Paul Veen <paul.veen@yahoo.com>
Date: Thu, 9 Oct 2025 13:40:24 +0200
Subject: [PATCH] [Common] Fix of small bug in muon QA

DCA values for realigned geometries are not saved in the container that was used to fill the histograms.
---
 Common/Tasks/qaMuon.cxx | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/Common/Tasks/qaMuon.cxx b/Common/Tasks/qaMuon.cxx
index b8646f83291..ce694a2d24d 100644
--- a/Common/Tasks/qaMuon.cxx
+++ b/Common/Tasks/qaMuon.cxx
@@ -2591,8 +2591,15 @@ struct muonQa {
       double mass = GetMuMuInvariantMass(fgValuesMuonPV1, fgValuesMuonPV2);
       double pT = GetMuMuPt(fgValuesMuonPV1, fgValuesMuonPV2);
       double yPair = GetMuMuRap(fgValuesMuonPV1, fgValuesMuonPV2);
-      double dcaXPair = muonPosPV.dcaX - muonNegPV.dcaX;
-      double dcaYPair = muonPosPV.dcaY - muonNegPV.dcaY;
+      double dcaXPair;
+      double dcaYPair;
+      if (configRealign.fDoRealign) {
+        dcaXPair = muonPos.dcaX - muonNeg.dcaX;
+        dcaYPair = muonPos.dcaY - muonNeg.dcaY;
+      } else {
+        dcaXPair = muonPosPV.dcaX - muonNegPV.dcaX;
+        dcaYPair = muonPosPV.dcaY - muonNegPV.dcaY;
+      }
       // mass cuts only used for DCA of Jpsi candidates
       double minJpsiMass = 2.8;
       double maxJpsiMass = 3.4;