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da0e9ce3 | 1 | /******************************************************************************* |
2 | * Project: BaBar detector at the SLAC PEP-II B-factory | |
3 | * Package: EvtGenBase | |
0ca57c2f | 4 | * File: $Id: EvtTwoBodyKine.hh,v 1.2 2009-03-16 16:34:38 robbep Exp $ |
da0e9ce3 | 5 | * Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002 |
6 | * | |
7 | * Copyright (C) 2002 Caltech | |
8 | *******************************************************************************/ | |
9 | ||
10 | // Descriptions of the kinematics of a two-body decay. | |
11 | ||
12 | #ifndef EVT_TWO_BODY_KINE_HH | |
13 | #define EVT_TWO_BODY_KINE_HH | |
14 | ||
15 | #include <iostream> | |
16 | ||
17 | class EvtTwoBodyKine { | |
18 | ||
19 | public: | |
20 | ||
21 | enum Index {A,B,AB}; | |
22 | ||
23 | EvtTwoBodyKine(); | |
24 | EvtTwoBodyKine(double mA, double mB, double mAB); | |
25 | EvtTwoBodyKine(const EvtTwoBodyKine& other); | |
26 | ~EvtTwoBodyKine(); | |
27 | ||
28 | // Accessors | |
29 | ||
30 | inline double mA() const { return _mA; } | |
31 | inline double mB() const { return _mB; } | |
32 | inline double mAB() const { return _mAB; } | |
33 | double m(Index i) const; | |
34 | ||
35 | // Momentum of the other two particles in the | |
36 | // rest-frame of particle i. | |
37 | ||
38 | double p(Index i = AB) const; | |
39 | ||
40 | // Energy of particle i in the rest frame of particle j | |
41 | ||
42 | double e(Index i, Index j) const; | |
43 | ||
44 | void print(std::ostream& os) const; | |
45 | ||
46 | private: | |
47 | ||
48 | double _mA; | |
49 | double _mB; | |
50 | double _mAB; | |
51 | }; | |
52 | ||
53 | std::ostream& operator<<(std::ostream& os, const EvtTwoBodyKine& p); | |
54 | ||
55 | #endif |