]>
Commit | Line | Data |
---|---|---|
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/EvtResonance.hh | |
12 | // | |
13 | // Description:resonance-defining class | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // NK September 4, 1997 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | ||
21 | #ifndef EVTRESONANCE_HH | |
22 | #define EVTRESONANCE_HH | |
23 | ||
24 | #include "EvtGenBase/EvtVector4R.hh" | |
25 | ||
26 | class EvtComplex; | |
27 | ||
28 | ||
29 | ||
30 | class EvtResonance { | |
31 | public: | |
32 | ||
33 | EvtResonance& operator = (const EvtResonance &); | |
34 | ||
35 | //constructor with all information about the resonance | |
36 | EvtResonance(const EvtVector4R& p4_p, const EvtVector4R& p4_d1, | |
37 | const EvtVector4R& p4_d2, | |
38 | double ampl = 0.0, double theta = 0.0, double gamma = 0.0, | |
39 | double bwm = 0.0, int spin = 0); | |
40 | ||
41 | //destructor | |
42 | virtual ~EvtResonance(); | |
43 | ||
44 | //accessors | |
45 | //return 4-momenta of the particles involved | |
46 | inline const EvtVector4R& p4_p() { return _p4_p; } | |
47 | inline const EvtVector4R& p4_d1() { return _p4_d1; } | |
48 | inline const EvtVector4R& p4_d2() { return _p4_d2; } | |
49 | ||
50 | ||
51 | //return amplitude | |
52 | inline double amplitude() { return _ampl; } | |
53 | ||
54 | //return theta | |
55 | inline double theta() { return _theta; } | |
56 | ||
57 | //return gamma | |
58 | inline double gamma() { return _gamma; } | |
59 | ||
60 | //return bwm | |
61 | inline double bwm() { return _bwm; } | |
62 | ||
63 | //return spin | |
64 | inline int spin() { return _spin; } | |
65 | ||
66 | //calculate amplitude for this resonance | |
67 | EvtComplex resAmpl(); | |
68 | ||
69 | //calculate relativistic Breit-Wigner amplitude for P-decays of scalars | |
70 | EvtComplex relBrWig(int i); | |
71 | ||
72 | private: | |
73 | ||
74 | EvtVector4R _p4_p, _p4_d1, _p4_d2; | |
75 | double _ampl, _theta, _gamma, _bwm; | |
76 | int _spin; | |
77 | ||
78 | }; | |
79 | ||
80 | #endif | |
81 |