1 //--------------------------------------------------------------------------
4 // This software is part of the EvtGen package developed jointly
5 // for the BaBar and CLEO collaborations. If you use all or part
6 // of it, please give an appropriate acknowledgement.
8 // Copyright Information: See EvtGen/COPYRIGHT
9 // Copyright (C) 1998 Caltech, UCSB
11 // Module: EvtGen/EvtTensorParticle.hh
13 // Description: Class to describe tensor ( spin 2 ) particles.
15 // Modification history:
17 // DJL/RYD Sept. 25, 1996 Module created
19 //------------------------------------------------------------------------
21 #ifndef EVTTENSORPARTICLE_HH
22 #define EVTTENSORPARTICLE_HH
24 #include "EvtGenBase/EvtTensor4C.hh"
25 #include "EvtGenBase/EvtParticle.hh"
27 class EvtTensorParticle: public EvtParticle {
31 EvtTensorParticle() {}
32 virtual ~EvtTensorParticle();
34 void init(EvtId part_n,double e,double px,double py,double pz);
35 void init(EvtId part_n,const EvtVector4R& p4);
36 void init(EvtId part_n,const EvtVector4R& p4,
37 const EvtTensor4C&,const EvtTensor4C&,const EvtTensor4C&,
38 const EvtTensor4C&,const EvtTensor4C&);
39 //Returns polarization tensors.
40 EvtTensor4C epsTensorParent(int i) const;
41 EvtTensor4C epsTensor(int i) const;
43 EvtSpinDensity rotateToHelicityBasis() const;
44 EvtSpinDensity rotateToHelicityBasis(double alpha,
51 EvtTensor4C eps[5];//eps1,eps2,eps3,eps4,eps5;
53 EvtTensorParticle(const EvtTensorParticle& tensor);
54 EvtTensorParticle& operator=(const EvtTensorParticle& tensor);