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da0e9ce3 | 1 | //-------------------------------------------------------------------------- |
2 | // | |
3 | // Environment: | |
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. | |
7 | // | |
8 | // Copyright Information: See EvtGen/COPYRIGHT | |
9 | // Copyright (C) 1998 Caltech, UCSB | |
10 | // | |
11 | // Module: EvtGen/EvtTensorParticle.hh | |
12 | // | |
13 | // Description: Class to describe tensor ( spin 2 ) particles. | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // DJL/RYD Sept. 25, 1996 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | ||
21 | #ifndef EVTTENSORPARTICLE_HH | |
22 | #define EVTTENSORPARTICLE_HH | |
23 | ||
24 | #include "EvtGenBase/EvtTensor4C.hh" | |
25 | #include "EvtGenBase/EvtParticle.hh" | |
26 | ||
27 | class EvtTensorParticle: public EvtParticle { | |
28 | ||
29 | public: | |
30 | ||
31 | EvtTensorParticle() {} | |
32 | virtual ~EvtTensorParticle(); | |
33 | ||
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; | |
42 | ||
43 | EvtSpinDensity rotateToHelicityBasis() const; | |
44 | EvtSpinDensity rotateToHelicityBasis(double alpha, | |
45 | double beta, | |
46 | double gamma) const; | |
47 | ||
48 | ||
49 | private: | |
50 | ||
51 | EvtTensor4C eps[5];//eps1,eps2,eps3,eps4,eps5; | |
52 | ||
53 | EvtTensorParticle(const EvtTensorParticle& tensor); | |
54 | EvtTensorParticle& operator=(const EvtTensorParticle& tensor); | |
55 | ||
56 | }; | |
57 | ||
58 | #endif | |
59 |