diff --git a/Phys/ParticleMatching/src/KSVelo2LongEfficiencyMonitor.cpp b/Phys/ParticleMatching/src/KSVelo2LongEfficiencyMonitor.cpp
index 9990ef3d16d68631bb96bd80edd26f15fd56e6c8..824d767e043dca85cf192dfeb1bb948447008972 100644
--- a/Phys/ParticleMatching/src/KSVelo2LongEfficiencyMonitor.cpp
+++ b/Phys/ParticleMatching/src/KSVelo2LongEfficiencyMonitor.cpp
@@ -15,6 +15,7 @@
 #include "LHCbAlgs/Consumer.h"
 #include "Relations/RelationWeighted1D.h"
 #include <Gaudi/Accumulators/Histogram.h>
+#include <numbers>
 
 namespace {
   using WeightedRelationTable = LHCb::RelationWeighted1D<LHCb::Particle, LHCb::Particle, float>;
@@ -45,6 +46,10 @@ public:
                                  Axis1D{ static_cast<unsigned int>( m_histodef_eff_eta.value().bins() ),
                                          m_histodef_eff_eta.value().lowEdge(),
                                          m_histodef_eff_eta.value().highEdge() } );
+    m_efficiency_vs_phi.emplace( this, "EfficiencyVsPhi", m_histodef_eff_phi.value().title(),
+                                 Axis1D{ static_cast<unsigned int>( m_histodef_eff_phi.value().bins() ),
+                                         m_histodef_eff_phi.value().lowEdge(),
+                                         m_histodef_eff_phi.value().highEdge() } );
 
     m_efficiency_vs_p_den.emplace( this, "EfficiencyVsP_den", m_histodef_eff_p.value().title() + "_den",
                                    Axis1D{ static_cast<unsigned int>( m_histodef_eff_p.value().bins() ),
@@ -57,6 +62,10 @@ public:
                                      Axis1D{ static_cast<unsigned int>( m_histodef_eff_eta.value().bins() ),
                                              m_histodef_eff_eta.value().lowEdge(),
                                              m_histodef_eff_eta.value().highEdge() } );
+    m_efficiency_vs_phi_den.emplace( this, "EfficiencyVsPhi_den", m_histodef_eff_phi.value().title() + "_den",
+                                     Axis1D{ static_cast<unsigned int>( m_histodef_eff_phi.value().bins() ),
+                                             m_histodef_eff_phi.value().lowEdge(),
+                                             m_histodef_eff_phi.value().highEdge() } );
 
     m_efficiency_vs_p_num.emplace( this, "EfficiencyVsP_num", m_histodef_eff_p.value().title() + "_num",
                                    Axis1D{ static_cast<unsigned int>( m_histodef_eff_p.value().bins() ),
@@ -69,6 +78,10 @@ public:
                                      Axis1D{ static_cast<unsigned int>( m_histodef_eff_eta.value().bins() ),
                                              m_histodef_eff_eta.value().lowEdge(),
                                              m_histodef_eff_eta.value().highEdge() } );
+    m_efficiency_vs_phi_num.emplace( this, "EfficiencyVsPhi_num", m_histodef_eff_phi.value().title() + "_num",
+                                     Axis1D{ static_cast<unsigned int>( m_histodef_eff_phi.value().bins() ),
+                                             m_histodef_eff_phi.value().lowEdge(),
+                                             m_histodef_eff_phi.value().highEdge() } );
 
     m_efficiency_vs_eta_p.emplace( this, "EfficiencyVsEtaP", m_histodef_eff_eta.value().title(),
                                    Axis1D{ static_cast<unsigned int>( m_histodef_eff_eta.value().bins() / 2 ),
@@ -123,6 +136,7 @@ public:
       ( *m_efficiency_vs_p_den )[probe_momentum.P() / 1000.] += weight;
       ( *m_efficiency_vs_pt_den )[probe_momentum.Pt() / 1000.] += weight;
       ( *m_efficiency_vs_eta_den )[probe_momentum.Eta()] += weight;
+      ( *m_efficiency_vs_phi_den )[probe_momentum.Phi()] += weight;
       float       matched  = 0.;
       auto const& matches  = matching_table.relations( probe );
       int         n_fthits = 0;
@@ -155,6 +169,7 @@ public:
         ( *m_efficiency_vs_p )[probe_momentum.P() / 1000.] += matched;
         ( *m_efficiency_vs_pt )[probe_momentum.Pt() / 1000.] += matched;
         ( *m_efficiency_vs_eta )[probe_momentum.Eta()] += matched;
+        ( *m_efficiency_vs_phi )[probe_momentum.Phi()] += matched;
         ( *m_efficiency_vs_eta_p )[{ probe_momentum.Eta(), probe_momentum.P() / 1000. }] += matched;
         ( *m_efficiency_vs_eta_pt )[{ probe_momentum.Eta(), probe_momentum.Pt() / 1000. }] += matched;
       }
@@ -162,6 +177,7 @@ public:
         ( *m_efficiency_vs_p_num )[probe_momentum.P() / 1000.] += weight;
         ( *m_efficiency_vs_pt_num )[probe_momentum.Pt() / 1000.] += weight;
         ( *m_efficiency_vs_eta_num )[probe_momentum.Eta()] += weight;
+        ( *m_efficiency_vs_phi_num )[probe_momentum.Phi()] += weight;
         m_fthits[n_fthits] += weight;
       }
     }
@@ -195,18 +211,26 @@ private:
       this, "HistogramDefEffPt", { "Efficiency versus pt [GeV]", 0.25, 5., 19 }, "Histogram definition" };
   Gaudi::Property<Gaudi::Histo1DDef> m_histodef_eff_eta{
       this, "HistogramDefEffEta", { "Efficiency versus eta", 1.5, 5., 14 }, "Histogram definition" };
+  Gaudi::Property<Gaudi::Histo1DDef> m_histodef_eff_phi{
+      this,
+      "HistogramDefEffPhi",
+      { "Efficiency versus phi", -std::numbers::pi, std::numbers::pi, 24 },
+      "Histogram definition" };
 
   mutable std::optional<Gaudi::Accumulators::ProfileHistogram<1>> m_efficiency_vs_p;
   mutable std::optional<Gaudi::Accumulators::ProfileHistogram<1>> m_efficiency_vs_pt;
   mutable std::optional<Gaudi::Accumulators::ProfileHistogram<1>> m_efficiency_vs_eta;
+  mutable std::optional<Gaudi::Accumulators::ProfileHistogram<1>> m_efficiency_vs_phi;
 
   mutable std::optional<Gaudi::Accumulators::Histogram<1>> m_efficiency_vs_p_den;
   mutable std::optional<Gaudi::Accumulators::Histogram<1>> m_efficiency_vs_pt_den;
   mutable std::optional<Gaudi::Accumulators::Histogram<1>> m_efficiency_vs_eta_den;
+  mutable std::optional<Gaudi::Accumulators::Histogram<1>> m_efficiency_vs_phi_den;
 
   mutable std::optional<Gaudi::Accumulators::Histogram<1>> m_efficiency_vs_p_num;
   mutable std::optional<Gaudi::Accumulators::Histogram<1>> m_efficiency_vs_pt_num;
   mutable std::optional<Gaudi::Accumulators::Histogram<1>> m_efficiency_vs_eta_num;
+  mutable std::optional<Gaudi::Accumulators::Histogram<1>> m_efficiency_vs_phi_num;
 
   mutable std::optional<Gaudi::Accumulators::ProfileHistogram<2>> m_efficiency_vs_eta_p;
   mutable std::optional<Gaudi::Accumulators::ProfileHistogram<2>> m_efficiency_vs_eta_pt;