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[u/mrichter/AliRoot.git] / PYTHIA8 / pythia8130 / include / ResonanceDecays.h
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5ad4eb21 1// ResonanceDecays.h is a part of the PYTHIA event generator.
2// Copyright (C) 2008 Torbjorn Sjostrand.
3// PYTHIA is licenced under the GNU GPL version 2, see COPYING for details.
4// Please respect the MCnet Guidelines, see GUIDELINES for details.
5
6// This file contains the main class for performing resonance decays.
7// ResonanceDecays: handles the sequential decay of resonances in process.
8
9#ifndef Pythia8_ResonanceDecays_H
10#define Pythia8_ResonanceDecays_H
11
12#include "Basics.h"
13#include "Event.h"
14#include "Info.h"
15#include "ParticleData.h"
16#include "PythiaStdlib.h"
17#include "ResonanceWidths.h"
18#include "Settings.h"
19
20namespace Pythia8 {
21
22//**************************************************************************
23
24// The ResonanceDecays class handles the sequential decay of resonances
25// that are part of the hard process (t, W, Z, H, SUSY,...).
26
27class ResonanceDecays {
28
29public:
30
31 // Constructor.
32 ResonanceDecays() {}
33
34 // Store pointer to Info for error messages.
35 void init(Info* infoPtrIn) {infoPtr = infoPtrIn;}
36
37 // Generate the next decay sequence.
38 bool next( Event& process);
39
40private:
41
42 // Constants: could only be changed in the code itself.
43 static const int NTRYCHANNEL, NTRYMASSES;
44 static const double MSAFETY, WIDTHCUT, TINY, WTCORRECTION[11];
45
46 // Pointer to various information on the generation.
47 Info* infoPtr;
48
49 // Select masses of decay products.
50 bool pickMasses();
51
52 // Select colours of decay products.
53 bool pickColours(int iDec, Event& process);
54
55 // Select kinematics isotropic in phase space.
56 bool pickKinematics();
57
58 // Flavour, colour and momentum information.
59 int id0, mult;
60 double m0;
61 vector<int> idProd, cols, acols;
62 vector<double> mProd;
63 vector<Vec4> pProd;
64
65};
66
67//**************************************************************************
68
69} // end namespace Pythia8
70
71#endif // Pythia8_ResonanceDecays_H