source: trunk/KtJet/KtEvent.h@ 23

#ifndef KTJET_KTEVENT_H
#define KTJET_KTEVENT_H

#include "KtJet/KtUtil.h"
#include "KtJet/KtDistanceInterface.h"
#include "KtJet/KtJetTable.h"
#include "KtJet/KtRecomInterface.h"
#include <vector>
#include <string>
#include "CLHEP/Vector/LorentzVector.h"


namespace KtJet {

  class KtLorentzVector;

  /**
   * The KtEvent class represents a whole system
   * of KtLorentzVectors constructed using
   * the defined KT clustering algorithm.

   @author J.Butterworth J.Couchman B.Cox B.Waugh
  */

  class KtEvent {
  public:
    /** Inclusive method constructors */
    KtEvent(const std::vector<KtLorentzVector> &, int type, int angle, int recom,
            KtFloat rparameter);
    KtEvent(const std::vector<KtLorentzVector> &, int type, KtDistance *, KtRecom *,
            KtFloat rparameter);
    KtEvent(const std::vector<KtLorentzVector> &, int type, KtDistance *, int recom,
            KtFloat rparameter);
    KtEvent(const std::vector<KtLorentzVector> &, int type, int angle, KtRecom *,
            KtFloat rparameter);
    KtEvent(const std::vector<CLHEP::HepLorentzVector> &, int type, int angle, int recom,
            KtFloat rparameter);
    /** Exclusive method constructors */
    KtEvent(const std::vector<KtLorentzVector> &, int type, int angle, int recom);
    KtEvent(const std::vector<KtLorentzVector> &, int type, KtDistance *, KtRecom *);
    KtEvent(const std::vector<KtLorentzVector> &, int type, KtDistance *, int recom);
    KtEvent(const std::vector<KtLorentzVector> &, int type, int angle, KtRecom *);
    KtEvent(const std::vector<CLHEP::HepLorentzVector> &, int type, int angle, int recom);
    /** Subjets method constructors */
    KtEvent(const KtLorentzVector & jet, int angle, int recom);
    KtEvent(const KtLorentzVector & jet, KtDistance *, KtRecom *);
    KtEvent(const KtLorentzVector & jet, KtDistance *, int recom);
    KtEvent(const KtLorentzVector & jet, int angle, KtRecom *);
    /** Destructor */
    ~KtEvent();

    /** Do exclusive jet-finding for nJets jets */
    void findJetsN(int nJets);
    /** Do exclusive jet-finding up to scale dCut */
    void findJetsD(KtFloat dCut);
    /** Do exclusive jet-finding up to parameter yCut */
    void findJetsY(KtFloat yCut);

    /** Returns the number of final state jets */
    inline int getNJets() const;
    /** Return final state jets without sorting */
    std::vector<KtLorentzVector> getJets();
    /** Return jets in order of decreasing E */
    std::vector<KtLorentzVector> getJetsE();
    /** Return final state jets in order of decreasing Et */
    std::vector<KtLorentzVector> getJetsEt();
    /** Return final state jets in order of decreasing Pt */
    std::vector<KtLorentzVector> getJetsPt();
    /** Return final state jets in order of decreasing rapidity */
    std::vector<KtLorentzVector> getJetsRapidity();
    /** Return final state jets in order of decreasing pseudorapidity (eta) */
    std::vector<KtLorentzVector> getJetsEta();

    /** d-cut where n+1 jets merged to n */
    inline KtFloat getDMerge(int nJets) const;
    /** y-cut where n+1 jets merged to n */
    inline KtFloat getYMerge(int nJets) const;

    /** Get number of objects input to KtEvent */
    inline int getNConstituents() const;
    /** Get pointers to input particles */
    std::vector<const KtLorentzVector *> getConstituents() const;
    /** Get copies of input particles */
    std::vector<KtLorentzVector> copyConstituents() const;

    /** Jet containing given particle
     *  If passed jet in this event, return same jet. If passed particle or jet not in this
     *  event, error. */
    KtLorentzVector getJet(const KtLorentzVector &) const;

    /** Set ECut value used in calculating YCut. Default is total transverse energy of the event */
    inline void setECut(KtFloat eCut);
    /** Get ECut value used in calculating YCut */
    inline KtFloat getECut() const;
    /** Get total energy in event */
    inline KtFloat getETot() const;
    /** Get collision type */
    inline int getType() const;
    /** Get distance ("angle") scheme */
    inline int getAngle() const;
    /** Get recombination scheme */
    inline int getRecom() const;
    /** Get inclusive flag: true if inclusive method constructor was used */
    inline bool isInclusive() const;

  private:

    /** Copy of original input particles */
    std::vector<KtLorentzVector> m_constituents;
    /** Collision type */
    int m_type;
    /** Kt distance scheme */
    int m_angle;
    /** Recombination scheme */
    int m_recom;
    KtRecom *m_ktRecom;
    /** R parameter squared */
    KtFloat m_rParameterSq;
    /** Flag for inclusive jets (false = exclusive) */
    bool m_inclusive;
    /** Energy scale for calculating y */
    KtFloat m_eCut;
    /** 1 / (eCut^2) */
    KtFloat m_etsq;
    /** Total energy in event */
    KtFloat m_eTot;
    /** d at each merge */
    std::vector<KtFloat> m_dMerge;
    /** Jets found */
    std::vector<KtLorentzVector> m_jets;
    /** merging history - jet/pair merged at each step */
    std::vector<int> m_hist;
    /** Function object to calculate jet resolution parameters */
    KtDistance *m_ktDist;

    /** Initialize event jet analysis */
    void init(const std::vector<KtLorentzVector> &, KtDistance* dist, int idist, KtRecom* recom, int irecom);
    /** Initialize subjet analysis */
    void init(const KtLorentzVector & jet, KtDistance* dist, int idist, KtRecom* recom, int irecom);
    /** Add up E and Et in event */
    void addEnergy();
    /** Make jets */
    void makeJets();
    /** Make KtLorentzVectors from CLHEP HepLorentzVectors */
    void makeKtFromHepLV(std::vector<KtLorentzVector> &, const std::vector<CLHEP::HepLorentzVector> &);
    /** Get right distance and recombinatoin schemes based on integer flags as necessary */
    void setSchemes(KtDistance* dist, int idist, KtRecom* recom, int irecom);
    /** Print steering parameters to stdout */
    void printSteering(std::string mode="") const;
    /** Print list of authors, URL of documentation etc. */
    void listAuthors() const;
  };

#include "KtJet/KtEvent.icc"

}//end of namespace

#endif