EvtTensorParticle.hh
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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);
	void init(EvtId part_n,const EvtVector4R& p4,
	const EvtTensor4C&,const EvtTensor4C&,const EvtTensor4C&,
	const EvtTensor4C&,const EvtTensor4C&);
	//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