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 "EvtParticle.hh"
#include "EvtTensor4C.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