EvtTensorParticle.hh

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtGen/EvtTensorParticle.hh
//
// Description: Class to describe tensor ( spin 2 ) particles.
//
// Modification history:
//
//    DJL/RYD     Sept. 25, 1996       Module created
//
//------------------------------------------------------------------------
 
#ifndef EVTTENSORPARTICLE_HH
#define EVTTENSORPARTICLE_HH
 
#include "EvtGenBase/EvtTensor4C.hh"
#include "EvtGenBase/EvtParticle.hh"
 
class EvtTensorParticle: public EvtParticle {
  
public:
 
  EvtTensorParticle() {}
  virtual ~EvtTensorParticle();
 
  void init(EvtId part_n,double e,double px,double py,double pz);
  void init(EvtId part_n,const EvtVector4R& p4);
//Returns polarization tensors.
  EvtTensor4C epsTensorParent(int i) const; 
  EvtTensor4C epsTensor(int i) const; 
 
  EvtSpinDensity rotateToHelicityBasis() const;
  EvtSpinDensity rotateToHelicityBasis(double alpha,
                       double beta,
                       double gamma) const;
 
  
private:
  
  EvtTensor4C eps[5];//eps1,eps2,eps3,eps4,eps5; 
 
  EvtTensorParticle(const EvtTensorParticle& tensor);  
  EvtTensorParticle& operator=(const EvtTensorParticle& tensor);  
 
};
 
#endif