make V0EventSelector produce skimmed V0 collection based on their mass

DQM/TrackingMonitorSource/plugins/V0EventSelector.cc

@@ -2,11 +2,13 @@
 #include <vector>
 #include "DataFormats/Common/interface/Handle.h"
 #include "DataFormats/Common/interface/View.h"
+#include "DataFormats/Common/interface/Ref.h"
 #include "DataFormats/Candidate/interface/VertexCompositeCandidate.h"
 #include "FWCore/Framework/interface/stream/EDFilter.h"
 #include "FWCore/Framework/interface/Event.h"
 #include "FWCore/Framework/interface/MakerMacros.h"
 #include "FWCore/ParameterSet/interface/ParameterSet.h"
+#include "FWCore/Utilities/interface/InputTag.h"
 
 class V0EventSelector : public edm::stream::EDFilter<> {
 public:
@@ -19,25 +21,45 @@ class V0EventSelector : public edm::stream::EDFilter<> {
 private:
   const edm::EDGetTokenT<reco::VertexCompositeCandidateCollection> vccToken_;
   const unsigned int minNumCandidates_;
+  const double massMin_;
+  const double massMax_;
 };
 
 V0EventSelector::V0EventSelector(const edm::ParameterSet& iConfig)
     : vccToken_{consumes<reco::VertexCompositeCandidateCollection>(
           iConfig.getParameter<edm::InputTag>("vertexCompositeCandidates"))},
-      minNumCandidates_{iConfig.getParameter<unsigned int>("minCandidates")} {}
+      minNumCandidates_{iConfig.getParameter<unsigned int>("minCandidates")},
+      massMin_{iConfig.getParameter<double>("massMin")},
+      massMax_{iConfig.getParameter<double>("massMax")} {
+  produces<reco::VertexCompositeCandidateCollection>();
+}
 
 bool V0EventSelector::filter(edm::Event& iEvent, const edm::EventSetup& iSetup) {
   edm::Handle<reco::VertexCompositeCandidateCollection> vccHandle;
   iEvent.getByToken(vccToken_, vccHandle);
 
-  return vccHandle->size() >= minNumCandidates_;
+  auto filteredVCC = std::make_unique<reco::VertexCompositeCandidateCollection>();
+
+  for (const auto& vcc : *vccHandle) {
+    if (vcc.mass() >= massMin_ && vcc.mass() <= massMax_) {
+      filteredVCC->push_back(vcc);
+    }
+  }
+
+  bool pass = filteredVCC->size() >= minNumCandidates_;
+  iEvent.put(std::move(filteredVCC));
+
+  return pass;
 }
 
 void V0EventSelector::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
   edm::ParameterSetDescription desc;
   desc.add<edm::InputTag>("vertexCompositeCandidates", edm::InputTag("generalV0Candidates:Kshort"));
-  desc.add<unsigned int>("minCandidates", 1);  // Change '1' to your desired minimum number of candidates
+  desc.add<unsigned int>("minCandidates", 1)->setComment("Minimum number of candidates required");
+  desc.add<double>("massMin", 0.0)->setComment("Minimum mass in GeV");
+  desc.add<double>("massMax", std::numeric_limits<double>::max())->setComment("Maximum mass in GeV");
   descriptions.addWithDefaultLabel(desc);
 }
 
+// Define this module as a plug-in
 DEFINE_FWK_MODULE(V0EventSelector);

DQM/TrackingMonitorSource/python/TrackingDataMCValidation_Standalone_cff.py

@@ -94,7 +94,7 @@
 ttbarEventSelector = cms.EDFilter("ttbarEventSelector")
 ttbarTracks = cms.EDProducer("TtbarTrackProducer")
 
-# Added modules for V0Monitoring
+# Added modules for V0Monitoring (standard)
 KshortMonitor = v0Monitor.clone()
 KshortMonitor.FolderName = "StandaloneTrackMonitor/V0Monitoring/Ks"
 KshortMonitor.v0         = "generalV0Candidates:Kshort"
@@ -108,6 +108,18 @@
 LambdaMonitor.histoPSet.massPSet = cms.PSet(nbins = cms.int32(100),
                                             xmin  = cms.double(1.050),
                                             xmax  = cms.double(1.250))
+
+# Added modules for V0Monitoring (for restricted mass candidates)
+SelectedKshortMonitor = KshortMonitor.clone(
+    FolderName = "StandaloneTrackMonitor/V0Monitoring/SelectedKs",
+    v0         = "KShortEventSelector"
+)
+
+SelectedLambdaMonitor = LambdaMonitor.clone(
+    FolderName = "StandaloneTrackMonitor/V0Monitoring/SelectedLambda",
+    v0         = "LambdaEventSelector"
+)
+
 ##################
 # For MinBias
 ##################
@@ -171,31 +183,31 @@
     * KShortEventSelector
     * KshortTracks
     * standaloneTrackMonitorK0
-    * KshortMonitor)
+    * SelectedKshortMonitor)
 
 standaloneValidationK0sMC = cms.Sequence(
     hltPathFilter
     * selectedPrimaryVertices
     * KShortEventSelector
     * KshortTracks
     * standaloneTrackMonitorK0MC
-    * KshortMonitor)
+    * SelectedKshortMonitor)
 
 standaloneValidationLambdas = cms.Sequence(
     hltPathFilter
     * selectedPrimaryVertices
     * LambdaEventSelector
     * LambdaTracks
     * standaloneTrackMonitorLambda
-    * LambdaMonitor)
+    * SelectedLambdaMonitor)
 
 standaloneValidationLambdasMC = cms.Sequence(
     hltPathFilter
     * selectedPrimaryVertices
     * LambdaEventSelector
     * LambdaTracks
     * standaloneTrackMonitorLambdaMC
-    * LambdaMonitor)
+    * SelectedLambdaMonitor)
 
 ##################
 # For ZtoEE

DQM/TrackingMonitorSource/python/V0Selections_cfi.py

@@ -1,12 +1,21 @@
 from DQM.TrackingMonitorSource.v0EventSelector_cfi import *
 from DQM.TrackingMonitorSource.v0VertexTrackProducer_cfi import *
 
-KShortEventSelector = v0EventSelector.clone()
+KShortEventSelector = v0EventSelector.clone(
+    vertexCompositeCandidates = "generalV0Candidates:Kshort",
+    massMin = 0.47,
+    massMax = 0.52,
+)
+
 LambdaEventSelector = v0EventSelector.clone(
-    vertexCompositeCandidates = "generalV0Candidates:Lambda"  
+    vertexCompositeCandidates = "generalV0Candidates:Lambda",
+    massMin = 1.11,
+    massMax = 1.128
 )
 
-KshortTracks = v0VertexTrackProducer.clone()
+KshortTracks = v0VertexTrackProducer.clone(
+    vertexCompositeCandidates = "KShortEventSelector"
+)
 LambdaTracks = v0VertexTrackProducer.clone(
-    vertexCompositeCandidates = "generalV0Candidates:Lambda"
+    vertexCompositeCandidates = "LambdaEventSelector"
 )