LeptonUpdater.cc

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#include "FWCore/Framework/interface/global/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "PhysicsTools/PatUtils/interface/MiniIsolation.h"
#include "DataFormats/Common/interface/View.h"

#include "DataFormats/PatCandidates/interface/Muon.h"
#include "DataFormats/PatCandidates/interface/Electron.h"
#include "DataFormats/PatCandidates/interface/PackedCandidate.h"
#include "DataFormats/MuonReco/interface/MuonSelectors.h"

namespace pat {
  

  template<typename T>
  class LeptonUpdater : public edm::global::EDProducer<> {

    public:

      explicit LeptonUpdater(const edm::ParameterSet & iConfig) :
            src_(consumes<std::vector<T>>(iConfig.getParameter<edm::InputTag>("src"))),
            vertices_(consumes<std::vector<reco::Vertex>>(iConfig.getParameter<edm::InputTag>("vertices"))),
            computeMiniIso_(iConfig.getParameter<bool>("computeMiniIso"))
        {
            //for mini-isolation calculation
            if (computeMiniIso_) {
                readMiniIsoParams(iConfig);
                pcToken_ = consumes<pat::PackedCandidateCollection >(iConfig.getParameter<edm::InputTag>("pfCandsForMiniIso"));
            }
        recomputeMuonBasicSelectors_ = false;
            if (typeid(T) == typeid(pat::Muon)) recomputeMuonBasicSelectors_ = iConfig.getParameter<bool>("recomputeMuonBasicSelectors");
            produces<std::vector<T>>();
        }

      ~LeptonUpdater() override {}

      void produce(edm::StreamID, edm::Event&, edm::EventSetup const&) const override ;

      static void fillDescriptions(edm::ConfigurationDescriptions & descriptions) {
          edm::ParameterSetDescription desc;
          desc.add<edm::InputTag>("src")->setComment("Lepton collection");
          desc.add<edm::InputTag>("vertices")->setComment("Vertex collection");
          desc.add<bool>("computeMiniIso", false)->setComment("Recompute miniIsolation");
          desc.addOptional<edm::InputTag>("pfCandsForMiniIso", edm::InputTag("packedPFCandidates"))->setComment("PackedCandidate collection used for miniIso");
          if (typeid(T) == typeid(pat::Muon)) {
            desc.add<bool>("recomputeMuonBasicSelectors",false)->setComment("Recompute basic cut-based muon selector flags");
            desc.addOptional<std::vector<double>>("miniIsoParams")->setComment("Parameters used for miniIso (as in PATMuonProducer)");
            descriptions.add("muonsUpdated", desc);
          } else if (typeid(T) == typeid(pat::Electron)) {
            desc.addOptional<std::vector<double>>("miniIsoParamsB")->setComment("Parameters used for miniIso in the barrel (as in PATElectronProducer)");
            desc.addOptional<std::vector<double>>("miniIsoParamsE")->setComment("Parameters used for miniIso in the endcap (as in PATElectronProducer)");
            descriptions.add("electronsUpdated", desc);
          }
      }

      void setDZ(T & lep, const reco::Vertex & pv) const {}
        
      void readMiniIsoParams(const edm::ParameterSet & iConfig) { 
          miniIsoParams_[0] = iConfig.getParameter<std::vector<double> >("miniIsoParams");
          if(miniIsoParams_[0].size() != 9) throw cms::Exception("ParameterError", "miniIsoParams must have exactly 9 elements.\n");
      }
      const std::vector<double> & miniIsoParams(const T &lep) const { return miniIsoParams_[0]; }

      void recomputeMuonBasicSelectors(T &, const reco::Vertex &, const bool) const;

    private:
      // configurables
      edm::EDGetTokenT<std::vector<T>> src_;
      edm::EDGetTokenT<std::vector<reco::Vertex>> vertices_;
      bool computeMiniIso_;
      bool recomputeMuonBasicSelectors_;
      std::vector<double> miniIsoParams_[2];
      edm::EDGetTokenT<pat::PackedCandidateCollection> pcToken_;
  };

  // must do the specialization within the namespace otherwise gcc complains
  //
  template<>
  void LeptonUpdater<pat::Electron>::setDZ(pat::Electron & anElectron, const reco::Vertex & pv) const {
      auto track = anElectron.gsfTrack();
      anElectron.setDB( track->dz(pv.position()), std::hypot(track->dzError(), pv.zError()), pat::Electron::PVDZ );
  }
  
  template<>
  void LeptonUpdater<pat::Muon>::setDZ(pat::Muon & aMuon, const reco::Vertex & pv) const {
      auto track = aMuon.muonBestTrack();
      aMuon.setDB( track->dz(pv.position()), std::hypot(track->dzError(), pv.zError()), pat::Muon::PVDZ );
  }

  template<>
  void LeptonUpdater<pat::Electron>::readMiniIsoParams(const edm::ParameterSet & iConfig) {
      miniIsoParams_[0] = iConfig.getParameter<std::vector<double> >("miniIsoParamsB");
      miniIsoParams_[1] = iConfig.getParameter<std::vector<double> >("miniIsoParamsE");
      if(miniIsoParams_[0].size() != 9) throw cms::Exception("ParameterError", "miniIsoParamsB must have exactly 9 elements.\n");
      if(miniIsoParams_[1].size() != 9) throw cms::Exception("ParameterError", "miniIsoParamsE must have exactly 9 elements.\n");
  }
  template<>
  const std::vector<double> & LeptonUpdater<pat::Electron>::miniIsoParams(const pat::Electron &lep) const { 
      return miniIsoParams_[lep.isEE()]; 
  }

  template<typename T>
  void LeptonUpdater<T>::recomputeMuonBasicSelectors(T & lep, const reco::Vertex & pv, const bool do_hip_mitigation_2016) const {}

  template<>
  void LeptonUpdater<pat::Muon>::recomputeMuonBasicSelectors(pat::Muon & lep, const reco::Vertex & pv, const bool do_hip_mitigation_2016) const {
    muon::setCutBasedSelectorFlags(lep, &pv, do_hip_mitigation_2016);
  }

} // namespace

template<typename T>
void pat::LeptonUpdater<T>::produce(edm::StreamID, edm::Event& iEvent, edm::EventSetup const&) const {
    edm::Handle<std::vector<T>> src;
    iEvent.getByToken(src_, src);

    edm::Handle<std::vector<reco::Vertex>> vertices;
    iEvent.getByToken(vertices_, vertices);
    const reco::Vertex & pv = vertices->front();

    edm::Handle<pat::PackedCandidateCollection> pc;
    if(computeMiniIso_) iEvent.getByToken(pcToken_, pc);

    std::unique_ptr<std::vector<T>> out(new std::vector<T>(*src));

    const bool do_hip_mitigation_2016 = recomputeMuonBasicSelectors_ && (272728 <= iEvent.run() && iEvent.run() <= 278808);

    for (unsigned int i = 0, n = src->size(); i < n; ++i) {
        T & lep = (*out)[i];
        setDZ(lep, pv);
        if (computeMiniIso_) {
            const auto & params = miniIsoParams(lep);
            pat::PFIsolation miniiso = pat::getMiniPFIsolation(pc.product(), lep.p4(),
                                                               params[0], params[1], params[2],
                                                               params[3], params[4], params[5],
                                                               params[6], params[7], params[8]);
            lep.setMiniPFIsolation(miniiso);
        }
    if (recomputeMuonBasicSelectors_) recomputeMuonBasicSelectors(lep,pv,do_hip_mitigation_2016);
    }

    iEvent.put(std::move(out));
}



typedef pat::LeptonUpdater<pat::Electron> PATElectronUpdater;
typedef pat::LeptonUpdater<pat::Muon> PATMuonUpdater;

#include "FWCore/Framework/interface/MakerMacros.h"
DEFINE_FWK_MODULE(PATElectronUpdater);
DEFINE_FWK_MODULE(PATMuonUpdater);