source: trunk/KtJet/KtLorentzVector.h@ 21

#ifndef KTJET_KTLORENTZVECTOR_H
#define KTJET_KTLORENTZVECTOR_H

#include <vector>
#include <cmath>
#include "KtJet/KtUtil.h"


namespace KtJet {
  /**
   * This Class represents a KtCluster Object.
   * It is just a CLHEP HepLorentzVector and also contains
   * a std::vector of all its constituent KtLorentzVectors
   * and an id number

   @author J.Butterworth J.Couchman B.Cox B.Waugh
  */
  class KtRecom;

  class KtLorentzVector : public CLHEP::HepLorentzVector {
  public:
    /** Default Constructor: create jet with no constituents */
    KtLorentzVector();
    /** Constructor: create particle with given 4-momentum */
    KtLorentzVector(const CLHEP::HepLorentzVector &);
    /** Constructor: create particle with given 4-momentum */
    KtLorentzVector(KtFloat px, KtFloat py, KtFloat pz, KtFloat e);

    /** Destructor */
    ~KtLorentzVector();

    /** return a reference to the vector of pointers of the KtLorentzVectors constituents */
    inline const std::vector<const KtLorentzVector*> & getConstituents() const;
    /** copy constituents */
    std::vector<KtLorentzVector> copyConstituents() const;
    /** returns the number of constituents KtLorentzVector is made up of */
    inline int getNConstituents() const;
    /** Check if a KtLorentzVector is a constituent */
    bool contains(const KtLorentzVector &) const;
    /** Add particle to jet using required recombination scheme to merge 4-momenta */
    void add(const KtLorentzVector &, KtRecom *recom);
    /** Add particle to jet using E scheme (4-vector addition) to merge 4-momenta */
    void add(const KtLorentzVector &);
    inline unsigned int getID() const {return m_id;}     // ??? Temporary, for debugging only
    /**  is it a Jet, not single particle */
    inline bool isJet() const;
    /** Add particle to jet using E scheme (4-vector addition) to merge 4-momenta */
    KtLorentzVector & operator+= (const KtLorentzVector &);
    /** Compare IDs of objects */
    inline bool operator== (const KtLorentzVector &) const;
    inline bool operator!= (const KtLorentzVector &) const;
    inline bool operator< (const KtLorentzVector &) const;
    inline bool operator> (const KtLorentzVector &) const;
  private:
    /** rapidity, only valid if haven't called other methods since last call to add() */
    inline KtFloat crapidity() const;
    /** rapidity, only valid if haven't called other methods since last call to add() */
    KtFloat m_crapidity;
    /** calculate rapidity */
    inline void calcRapidity();
    /** private method to help add constituents to vector */
    void addConstituents(const KtLorentzVector*) ;
    /** KtLorentzVectors id number */
    unsigned int m_id;
    /** Pointers to constituents */
    std::vector<const KtLorentzVector*> m_constituents;
    /** Particle rather than jet */
    bool m_isAtomic;
    /** Number of instances so far */
    static unsigned int m_num;
    /** Some classes need access to crapidity for efficiency reasons */
    friend class KtDistanceDeltaR;
    friend class KtDistanceQCD;
  };

  bool greaterE(const CLHEP::HepLorentzVector &, const CLHEP::HepLorentzVector &);
  bool greaterEt(const CLHEP::HepLorentzVector &, const CLHEP::HepLorentzVector &);
  bool greaterPt(const CLHEP::HepLorentzVector &, const CLHEP::HepLorentzVector &);
  bool greaterRapidity(const CLHEP::HepLorentzVector &, const CLHEP::HepLorentzVector &);
  bool greaterEta(const CLHEP::HepLorentzVector &, const CLHEP::HepLorentzVector &);

#include "KtJet/KtLorentzVector.icc"

}//end of namespace
#endif