/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/RecoVertex/NuclearInteractionProducer/src/NuclearLikelihood.cc

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#include "RecoVertex/NuclearInteractionProducer/interface/NuclearLikelihood.h"

void NuclearLikelihood::calculate( const reco::Vertex& vtx ) {
      likelihood_ = 0.0;
      if( vtx.isValid() ) {
           if(vtx.tracksSize() > 1) {
               likelihood_ = 0.3;
               int idBest;
               int secMaxHits = secondaryTrackMaxHits( vtx, idBest );
               if( secMaxHits > 3 ) likelihood_ =0.5;
               if( secMaxHits > 4 ) likelihood_ =0.7;
               if( (*(vtx.tracks_begin()+idBest))->normalizedChi2() < 3.0) likelihood_=1.0;
           }
      }
}

int NuclearLikelihood::secondaryTrackMaxHits( const reco::Vertex& vtx , int& id) {
      int maxHits = 0;
      if( vtx.tracksSize() < 2 )  return 0;
      int i=1;
      for( reco::Vertex::trackRef_iterator it = vtx.tracks_begin()+1; it != vtx.tracks_end(); ++it){
            int nhits = (*it)->numberOfValidHits();
            if( nhits > maxHits ) { maxHits = nhits; id=i; }
            i++;
      }
      return maxHits;
}