From f49b3911817f4f3f1957da330f732943197bb961 Mon Sep 17 00:00:00 2001
From: Nicolas Strangmann <nicolas.strangmann@.cern.ch>
Date: Wed, 23 Apr 2025 20:55:44 +0200
Subject: [PATCH 1/2] [PWGEM/PhotonMeson] Add multiplicity cut for HNM analysis

---
 PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx b/PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx
index 56ef57a6d79..0d3e802a29b 100644
--- a/PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx
+++ b/PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx
@@ -128,6 +128,7 @@ struct HeavyNeutralMeson {
   Configurable<LabeledArray<float>> cfgMassWindowOmega{"cfgMassWindowOmega", {DefaultMassWindows[0], 4, {"pi0_min", "pi0_max", "omega_min", "omega_max"}}, "Mass window for selected omegas and their decay pi0"};
   Configurable<LabeledArray<float>> cfgMassWindowEtaPrime{"cfgMassWindowEtaPrime", {DefaultMassWindows[1], 4, {"eta_min", "eta_max", "etaprime_min", "etaprime_max"}}, "Mass window for selected eta' and their decay eta"};
 
+  Configurable<float> cfgMaxMultiplicity{"cfgMaxMultiplicity", 5000, "Maximum number of tracks in a collision (can be used to increase the S/B -> Very experimental)"};
   Configurable<float> cfgMinGGPtOverHNMPt{"cfgMinGGPtOverHNMPt", 0., "Minimum ratio of the pT of the gamma gamma pair over the pT of the HNM (can be used to increase the S/B)"};
 
   HistogramRegistry mHistManager{"HeavyNeutralMesonHistograms", {}, OutputObjHandlingPolicy::AnalysisObject};
@@ -210,6 +211,9 @@ struct HeavyNeutralMeson {
     if (confEvtRequireSel8 && !col.sel8()) {
       return false;
     }
+    if(col.multNTracksPV() > cfgMaxMultiplicity) {
+      return false;
+    }
     return true;
   }
 

From a7eac4495e899d9ec13beaf4f5c2e6a2549cac25 Mon Sep 17 00:00:00 2001
From: ALICE Action Bot <alibuild@cern.ch>
Date: Wed, 23 Apr 2025 18:56:41 +0000
Subject: [PATCH 2/2] Please consider the following formatting changes

---
 PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx b/PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx
index 0d3e802a29b..b416f173480 100644
--- a/PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx
+++ b/PWGEM/PhotonMeson/Tasks/HeavyNeutralMeson.cxx
@@ -211,7 +211,7 @@ struct HeavyNeutralMeson {
     if (confEvtRequireSel8 && !col.sel8()) {
       return false;
     }
-    if(col.multNTracksPV() > cfgMaxMultiplicity) {
+    if (col.multNTracksPV() > cfgMaxMultiplicity) {
       return false;
     }
     return true;