PairAnalysisPairKF.h

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#ifndef PAIRANALYSISPAIRKF_H
#define PAIRANALYSISPAIRKF_H
/* Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */
 
//#############################################################
//#                                                           #
//#                  PairAnalysisPairKF                      #
//#               Class to store pair information             #
//#                                                           #
//#                                                           #
//#  Authors:                                                 #
//#   Julian    Book,     Uni Ffm / Julian.Book@cern.ch       #
//#                                                           #
//#############################################################
 
#include <TLorentzVector.h>
#include <TMath.h>
 
#include <KFParticle.h>
 
#include "PairAnalysisPair.h"
#include "PairAnalysisTrack.h"
#include "PairAnalysisTrackRotator.h"
 
class CbmVertex;
class CbmMCTrack;
 
class PairAnalysisPairKF : public PairAnalysisPair {
public:
  PairAnalysisPairKF();
  virtual ~PairAnalysisPairKF();
  PairAnalysisPairKF(const PairAnalysisPair& pair);
 
  PairAnalysisPairKF(PairAnalysisTrack* const particle1, Int_t pid1, PairAnalysisTrack* const particle2, Int_t pid2,
                     Char_t type);
 
  void SetTracks(PairAnalysisTrack* const particle1, Int_t pid1, PairAnalysisTrack* const particle2, Int_t pid2);
 
  void SetMCTracks(const CbmMCTrack* const particle1, const CbmMCTrack* const particle2);
 
  // kinematics
  virtual Double_t Px() const { return fPair.GetPx(); }
  virtual Double_t Py() const { return fPair.GetPy(); }
  virtual Double_t Pz() const { return fPair.GetPz(); }
  virtual Double_t Pt() const { return fPair.GetPt(); }
  virtual Double_t P() const { return fPair.GetP(); }
  virtual Bool_t PxPyPz(Double_t p[3]) const
  {
    p[0] = Px();
    p[1] = Py();
    p[2] = Pz();
    return kTRUE;
  }
 
  virtual Double_t Xv() const { return fPair.GetX(); }
  virtual Double_t Yv() const { return fPair.GetY(); }
  virtual Double_t Zv() const { return fPair.GetZ(); }
  virtual Bool_t XvYvZv(Double_t x[3]) const
  {
    x[0] = Xv();
    x[1] = Yv();
    x[2] = Zv();
    return kTRUE;
  }
 
  virtual Double_t OneOverPt() const { return Pt() > 0. ? 1. / Pt() : 0.; }  //TODO: check
  virtual Double_t Phi() const { return fPair.GetPhi(); }
  virtual Double_t Theta() const { return Pz() != 0 ? TMath::ATan(Pt() / Pz()) : 0.; }  //TODO: check
 
 
  virtual Double_t E() const { return fPair.GetE(); }
  virtual Double_t M() const { return fPair.GetMass(); }
 
  virtual Double_t Eta() const { return fPair.GetEta(); }
  virtual Double_t Y() const
  {
    if ((E() * E() - Px() * Px() - Py() * Py() - Pz() * Pz()) > 0.)
      return TLorentzVector(Px(), Py(), Pz(), E()).Rapidity();
    else
      return -1111.;
  }
 
  //  virtual Short_t Charge() const    { return fPair.GetQ();}
  //  void SetProductionVertex(const KFParticle &Vtx) { fPair.SetProductionVertex(Vtx); }
 
  //inter leg information
  Double_t GetChi2() const { return fPair.GetChi2(); }
  Int_t GetNdf() const { return fPair.GetNDF(); }
  Double_t GetDecayLength() const { return fPair.GetDecayLength(); }
  Double_t GetR() const { return fPair.GetR(); }
  Double_t OpeningAngle() const { return fD1.GetAngle(fD2); }
  Double_t OpeningAngleXY() const { return fD1.GetAngleXY(fD2); }
  Double_t OpeningAngleRZ() const { return fD1.GetAngleRZ(fD2); }
  Double_t DistanceDaughters() const { return fD1.GetDistanceFromParticle(fD2); }
  Double_t DistanceDaughtersXY() const { return fD1.GetDistanceFromParticleXY(fD2); }
  Double_t DeviationDaughters() const { return fD1.GetDeviationFromParticle(fD2); }
  Double_t DeviationDaughtersXY() const { return fD1.GetDeviationFromParticleXY(fD2); }
  Double_t DeltaEta() const { return TMath::Abs(fD1.GetEta() - fD2.GetEta()); }
  Double_t DeltaPhi() const { return fD1.GetAngleXY(fD2); }
  Double_t DaughtersP() const { return fD1.GetP() * fD2.GetP(); }
 
  // calculate cos(theta*) and phi* in HE and CS pictures
  void GetThetaPhiCM(Double_t& thetaHE, Double_t& phiHE, Double_t& thetaCS, Double_t& phiCS) const;
 
  Double_t PsiPair(Double_t MagField) const;   //Angle cut w.r.t. to magnetic field
  Double_t PhivPair(Double_t MagField) const;  //Angle of ee plane w.r.t. to magnetic field
 
  // TODO: replace by KFParticleBase functions?
  Double_t GetArmAlpha() const;
  Double_t GetArmPt() const;
 
  // internal KF particle
  const KFParticle& GetKFParticle() const { return fPair; }
  const KFParticle& GetKFFirstDaughter() const { return fD1; }
  const KFParticle& GetKFSecondDaughter() const { return fD2; }
 
  // rotations
  virtual void RotateTrack(PairAnalysisTrackRotator* /*rot*/) { return; }
 
 
private:
  KFParticle fPair;  // KF particle internally used for pair calculation
  KFParticle fD1;    // KF particle first daughter
  KFParticle fD2;    // KF particle1 second daughter
 
  ClassDef(PairAnalysisPairKF, 1)
};
 
#endif