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bak-BesEvtGen-00-04-08/src/EvtGen/EvtGenBase/EvtTwoBodyKine.hh
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1/*******************************************************************************
2 * Project: BaBar detector at the SLAC PEP-II B-factory
3 * Package: EvtGenBase
4 * File: $Id: EvtTwoBodyKine.hh,v 1.1.1.2 2007/10/26 05:03:14 pingrg Exp $
5 * Author: Alexei Dvoretskii, [email protected], 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
18
19public:
20
21 enum Index {A,B,AB};
22
24 EvtTwoBodyKine(double mA, double mB, double mAB);
25 EvtTwoBodyKine(const EvtTwoBodyKine& other);
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
46private:
47
48 double _mA;
49 double _mB;
50 double _mAB;
51};
52
53std::ostream& operator<<(std::ostream& os, const EvtTwoBodyKine& p);
54
55#endif
std::ostream & operator<<(std::ostream &os, const EvtTwoBodyKine &p)
void print(std::ostream &os) const