CATopJetHelperUser Class Reference

#include <HLTCATopTagFilter.h>

Public Member Functions
	CATopJetHelperUser (double TopMass)
reco::CATopJetProperties	operator() (reco::Jet const &ihardJet) const

Protected Attributes
double	TopMass_

Detailed Description

Definition at line 28 of file HLTCATopTagFilter.h.

Constructor & Destructor Documentation

CATopJetHelperUser::CATopJetHelperUser ( double  TopMass )

inline

Definition at line 31 of file HLTCATopTagFilter.h.

References operator()().

                                     :
  TopMass_(TopMass)
    {}

Member Function Documentation

reco::CATopJetProperties CATopJetHelperUser::operator()

(

reco::Jet const &

ihardJet

)

const

Definition at line 78 of file HLTCATopTagFilter.h.

References reco::Jet::getJetConstituents(), reco::LeafCandidate::mass(), reco::CATopJetProperties::minMass, reco::CATopJetProperties::nSubJets, jetUpdater_cfi::sort, and reco::CATopJetProperties::topMass.

Referenced by CATopJetHelperUser().

                                                                                      {
  reco::CATopJetProperties properties;
  // Get subjets
  reco::Jet::Constituents subjets = ihardJet.getJetConstituents();
  properties.nSubJets = subjets.size();  // number of subjets
  properties.topMass = ihardJet.mass();      // jet mass
  properties.minMass = 999999.;            // minimum mass pairing

  // Require at least three subjets in all cases, if not, untagged
  if ( properties.nSubJets >= 3 ) {

    // Take the highest 3 pt subjets for cuts
    sort ( subjets.begin(), subjets.end(), GreaterByPtCandPtrUser() );
       
    // Now look at the subjets that were formed
    for ( int isub = 0; isub < 2; ++isub ) {

      // Get this subjet
      reco::Jet::Constituent icandJet = subjets[isub];

      // Now look at the "other" subjets than this one, form the minimum invariant mass
      // pairing, as well as the "closest" combination to the W mass
      for ( int jsub = isub + 1; jsub < 3; ++jsub ) {

        // Get the second subjet
    reco::Jet::Constituent jcandJet = subjets[jsub];

    reco::Candidate::LorentzVector wCand = icandJet->p4() + jcandJet->p4();

        // Get the candidate mass
        double imw = wCand.mass();

        // Find the minimum mass pairing. 
        if ( fabs( imw ) < properties.minMass ) {
          properties.minMass = imw;
        }  
      }// end second loop over subjets
    }// end first loop over subjets
  }// endif 3 subjets

  if (properties.minMass == 999999) properties.minMass=-1;

  return properties;
}

Member Data Documentation

double CATopJetHelperUser::TopMass_

protected

Definition at line 38 of file HLTCATopTagFilter.h.