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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/EvtResonance2.hh | |
12 | // | |
13 | // Description:resonance-defining class | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // lange Nov 21, 2000 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | ||
21 | #ifndef EVTRESONANCE2_HH | |
22 | #define EVTRESONANCE2_HH | |
23 | ||
24 | #include "EvtGenBase/EvtVector4R.hh" | |
25 | ||
26 | class EvtComplex; | |
27 | ||
28 | ||
29 | ||
30 | class EvtResonance2 { | |
31 | public: | |
32 | ||
33 | //operator | |
34 | EvtResonance2& operator = (const EvtResonance2 &); | |
35 | ||
36 | //constructor with all information about the resonance | |
37 | // invmass_angdenom chooses whether to use the resonance mass (false) | |
38 | // or the daughter invariant mass (true) for the denominators in | |
39 | // angular distributions | |
40 | ||
41 | EvtResonance2(const EvtVector4R& p4_p, const EvtVector4R& p4_d1, | |
42 | const EvtVector4R& p4_d2, | |
43 | double ampl = 0.0, double theta = 0.0, double gamma = 0.0, | |
44 | double bwm = 0.0, int spin = 0, bool invmass_angdenom = false); | |
45 | ||
46 | //destructor | |
47 | virtual ~EvtResonance2(); | |
48 | ||
49 | //accessors | |
50 | //return 4-momenta of the particles involved | |
51 | inline const EvtVector4R& p4_p() { return _p4_p; } | |
52 | inline const EvtVector4R& p4_d1() { return _p4_d1; } | |
53 | inline const EvtVector4R& p4_d2() { return _p4_d2; } | |
54 | ||
55 | ||
56 | //return amplitude | |
57 | inline double amplitude() { return _ampl; } | |
58 | ||
59 | //return theta | |
60 | inline double theta() { return _theta; } | |
61 | ||
62 | //return gamma | |
63 | inline double gamma() { return _gamma; } | |
64 | ||
65 | //return bwm | |
66 | inline double bwm() { return _bwm; } | |
67 | ||
68 | //return spin | |
69 | inline int spin() { return _spin; } | |
70 | ||
71 | //calculate amplitude for this resonance | |
72 | EvtComplex resAmpl(); | |
73 | ||
74 | private: | |
75 | ||
76 | EvtVector4R _p4_p, _p4_d1, _p4_d2; | |
77 | double _ampl, _theta, _gamma, _bwm; | |
78 | int _spin; | |
79 | bool _invmass_angdenom; | |
80 | ||
81 | }; | |
82 | ||
83 | #endif | |
84 |