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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: EvtSVS.cc | |
12 | // | |
13 | // Description: Routine to decay scalar -> vector + scalar | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // RYD November 24, 1996 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | // | |
21 | #include "EvtGenBase/EvtPatches.hh" | |
22 | #include <stdlib.h> | |
23 | #include "EvtGenBase/EvtParticle.hh" | |
24 | #include "EvtGenBase/EvtGenKine.hh" | |
25 | #include "EvtGenBase/EvtReport.hh" | |
26 | #include "EvtGenBase/EvtPDL.hh" | |
27 | #include "EvtGenBase/EvtVector4C.hh" | |
28 | #include "EvtGenModels/EvtSVS.hh" | |
29 | #include <string> | |
30 | ||
31 | EvtSVS::~EvtSVS() {} | |
32 | ||
33 | std::string EvtSVS::getName(){ | |
34 | ||
35 | return "SVS"; | |
36 | ||
37 | } | |
38 | ||
39 | ||
40 | EvtDecayBase* EvtSVS::clone(){ | |
41 | ||
42 | return new EvtSVS; | |
43 | ||
44 | } | |
45 | ||
46 | void EvtSVS::init(){ | |
47 | ||
48 | // check that there are 0 arguments | |
49 | checkNArg(0); | |
50 | checkNDaug(2); | |
51 | ||
52 | checkSpinParent(EvtSpinType::SCALAR); | |
53 | ||
54 | checkSpinDaughter(0,EvtSpinType::VECTOR); | |
55 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
56 | ||
57 | ||
58 | } | |
59 | ||
60 | ||
61 | ||
62 | void EvtSVS::initProbMax(){ | |
63 | ||
64 | setProbMax(1.0); | |
65 | ||
66 | } | |
67 | ||
68 | void EvtSVS::decay( EvtParticle *p){ | |
69 | ||
70 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
71 | ||
72 | EvtParticle *v; | |
73 | v = p->getDaug(0); | |
74 | double massv = v->mass(); | |
75 | EvtVector4R momv = v->getP4(); | |
76 | EvtVector4R moms = p->getDaug(1)->getP4(); | |
77 | double m_parent = p->mass(); | |
78 | EvtVector4R p4_parent = momv+moms; | |
79 | ||
80 | double norm=massv/(momv.d3mag()*m_parent); | |
81 | p4_parent = norm*p4_parent; | |
82 | vertex(0,p4_parent*(v->epsParent(0))); | |
83 | vertex(1,p4_parent*(v->epsParent(1))); | |
84 | vertex(2,p4_parent*(v->epsParent(2))); | |
85 | ||
86 | return ; | |
87 | } | |
88 |