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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) 2002 Caltech | |
10 | // | |
11 | // Module: EvtGen/EvtEvalHelAmp.hh | |
12 | // | |
13 | // Description: Class for evaluation of amplitudes in the | |
14 | // helicity formalism. | |
15 | // | |
16 | // | |
17 | // Modification history: | |
18 | // | |
19 | // RYD October 24, 2002 Module created | |
20 | // | |
21 | //------------------------------------------------------------------------ | |
22 | ||
23 | #ifndef EVTEVALHELAMP_HH | |
24 | #define EVTEVALHELAMP_HH | |
25 | ||
26 | #include "EvtGenBase/EvtDecayAmp.hh" | |
27 | #include "EvtGenBase/EvtSpinType.hh" | |
28 | #include "EvtGenBase/EvtId.hh" | |
29 | ||
30 | class EvtParticle; | |
31 | class EvtAmp; | |
32 | ||
33 | class EvtEvalHelAmp{ | |
34 | ||
35 | public: | |
36 | ||
37 | EvtEvalHelAmp(EvtId idA, | |
38 | EvtId idB, | |
39 | EvtId idC, | |
40 | EvtComplexPtrPtr HBC); | |
41 | ||
42 | virtual ~EvtEvalHelAmp(); | |
43 | ||
44 | double probMax(); | |
45 | ||
46 | void evalAmp(EvtParticle *p, EvtAmp& amp); | |
47 | ||
48 | ||
49 | private: | |
50 | ||
51 | void fillHelicity(int* lambda2,int n,int J2, EvtId id); | |
52 | void setUpRotationMatrices(EvtParticle *p,double theta, double phi); | |
53 | void applyRotationMatrices(); | |
54 | ||
55 | //spins states available for particle A, B, and C. | |
56 | int _nA,_nB,_nC; | |
57 | ||
58 | //helicity amplitudes | |
59 | EvtComplexPtrPtr _HBC; | |
60 | ||
61 | //2 times spin for each of the particles | |
62 | int _JA2,_JB2,_JC2; | |
63 | ||
64 | //2 times the helicity for the states | |
65 | int *_lambdaA2,*_lambdaB2,*_lambdaC2; | |
66 | ||
67 | //Rotation matrices | |
68 | EvtComplexPtrPtr _RA,_RB,_RC; | |
69 | ||
70 | //temporary array for amplitudes | |
71 | EvtComplexPtrPtrPtr _amp,_amp1,_amp3; | |
72 | ||
73 | }; | |
74 | ||
75 | #endif | |
76 | ||
77 | ||
78 | ||
79 | ||
80 | ||
81 |