METAlgo.cc

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// -*- C++ -*-
//
// Package:    METAlgorithms
// Class:      METAlgo
//
// Original Authors:  Michael Schmitt, Richard Cavanaugh The University of Florida
//          Created:  May 31, 2005
//

//____________________________________________________________________________||
#include "RecoMET/METAlgorithms/interface/METAlgo.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "DataFormats/Math/interface/LorentzVector.h"

//____________________________________________________________________________||
CommonMETData METAlgo::run(const edm::View<reco::Candidate>& candidates, double globalThreshold) {
  math::XYZTLorentzVector p4;
  for (auto cand = candidates.begin(); cand != candidates.end(); ++cand) {
    if (!(cand->et() > globalThreshold))
      continue;
    p4 += cand->p4();
  }
  math::XYZTLorentzVector met = -p4;

  CommonMETData ret;
  ret.mex = met.Px();
  ret.mey = met.Py();

  ret.mez = met.Pz();  // included here since it might be useful
                       // for Data Quality Monitering as it should be
                       // symmetrically distributed about the origin

  ret.met = met.Pt();

  double et = 0.0;
  for (auto cand = candidates.begin(); cand != candidates.end(); ++cand) {
    if (!(cand->et() > globalThreshold))
      continue;
    et += cand->et();
  }

  ret.sumet = et;

  return ret;
}

//____________________________________________________________________________||