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KtLorentzVector Methods These methods would normally be used to investigate the structure and constituents of final state jets defined in a particular KtEvent. const std::vector<const KtLorentzVector*> & getConstituents() const; Returns a reference to the vector of pointers to all the objects in the KtLorentzVector. std::vector<KtLorentzVector> copyConstituents() const; Returns a vector of copies of the objects in the KtLorentzVector. int getNConstituents() const; Returns the number of objects in the KtLorentzVector. bool contains (const KtLorentzVector &) const; Check if a jet contains a particular object. For example, if (JET.contains(PARTICLE)) { /* do something */ } where JET is the KtLorentzVector of a final state jet and PARTICLE is the KtLorentzVector of an input object in the KtEvent. KtLorentzVector & operator+= (const KtLorentzVector &); Adds a KtLorentzVector constituent to a jet using the $E$ scheme (4-vector addition) and maintains an internal record of constituents (so for example the getConstituents method will work on the resulting KtLorentzVector). void add (const KtLorentzVector &, int recom); Adds a KtLorentzVector constituent to a jet using any of the available recombination schemes and maintains an internal record of constituents. Note that the momentum of a jet (KtLorentzVector) will be given according to the recombination scheme used in its construction. If the user wishes to reconstruct the momenta according to a different recombination scheme (for example, to recover the mass for jets which were found using a massless recombination scheme) the getConstituents() or copyConstituents() methods may be used. The constituents can then be recombined in a new scheme using the add method.