add configurable for min. V0 candidate storage per event

Author: Steffimro

PWGEM/Dilepton/TableProducer/filterEoI.cxx

@@ -50,6 +50,7 @@ struct filterEoI {
   Configurable<bool> inheritFromOtherTask{"inheritFromOtherTask", true, "Flag to iherit all common configurables from skimmerPrimaryElectron or skimmerPrimaryMuon"};
   Configurable<int> minNelectron{"minNelectron", -1, "min number of electron candidates per collision"};
   Configurable<int> minNmuon{"minNmuon", -1, "min number of muon candidates per collision"};
+  Configurable<int> minNphotons{"minNphotons", 1, "min number of photon candidates per collision"};
   Configurable<std::string> taskNameForNelectron{"taskNameForNelectron", "skimmer-primary-electron", "task name where minNelectron is defined."};
   Configurable<std::string> varNameForNelectron{"varNameForNelectron", "minNelectron", "variable name for minNelectron"};
 
@@ -63,6 +64,7 @@ struct filterEoI {
 
     LOGF(info, "minNelectron = %d", minNelectron.value);
     LOGF(info, "minNmuon = %d", minNmuon.value);
+    LOGF(info, "minNphotons = %d", minNphotons.value);
 
     auto hEventCounter = fRegistry.add<TH1>("hEventCounter", "hEventCounter", kTH1D, {{8, 0.5f, 8.5f}});
     hEventCounter->GetXaxis()->SetBinLabel(1, "all");
@@ -107,7 +109,7 @@ struct filterEoI {
       }
       if constexpr (static_cast<bool>(system & kPCM)) {
         auto v0s_coll = v0s.sliceBy(perCollision_v0, collision.globalIndex());
-        if (v0s_coll.size() >= 1) {
+        if (v0s_coll.size() >= minNphotons) {
           does_pcm_exist = true;
           fRegistry.fill(HIST("hEventCounter"), 4);
         }