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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: EvtSTS.cc | |
12 | // | |
13 | // Description: Routine to decay scalar -> tensor scalar. | |
14 | // | |
15 | // | |
16 | // Modification history: | |
17 | // | |
18 | // RYD Aug 21, 1998 Module created | |
19 | // | |
20 | //------------------------------------------------------------------------ | |
21 | // | |
22 | #include "EvtGenBase/EvtPatches.hh" | |
23 | #include <stdlib.h> | |
24 | #include "EvtGenBase/EvtParticle.hh" | |
25 | #include "EvtGenBase/EvtGenKine.hh" | |
26 | #include "EvtGenBase/EvtTensor4C.hh" | |
27 | #include "EvtGenBase/EvtVector4C.hh" | |
28 | #include "EvtGenBase/EvtPDL.hh" | |
29 | #include "EvtGenBase/EvtReport.hh" | |
30 | #include "EvtGenModels/EvtSTS.hh" | |
31 | #include "EvtGenBase/EvtId.hh" | |
32 | #include <string> | |
33 | ||
34 | EvtSTS::~EvtSTS() {} | |
35 | ||
36 | std::string EvtSTS::getName(){ | |
37 | ||
38 | return "STS"; | |
39 | ||
40 | } | |
41 | ||
42 | ||
43 | EvtDecayBase* EvtSTS::clone(){ | |
44 | ||
45 | return new EvtSTS; | |
46 | ||
47 | } | |
48 | ||
49 | void EvtSTS::initProbMax(){ | |
50 | ||
51 | setProbMax(20.0); | |
52 | ||
53 | } | |
54 | ||
55 | void EvtSTS::init(){ | |
56 | ||
57 | // check that there are 0 arguments | |
58 | checkNArg(0); | |
59 | checkNDaug(2); | |
60 | ||
61 | checkSpinParent(EvtSpinType::SCALAR); | |
62 | ||
63 | checkSpinDaughter(0,EvtSpinType::TENSOR); | |
64 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
65 | ||
66 | } | |
67 | ||
68 | ||
69 | void EvtSTS::decay( EvtParticle *p){ | |
70 | ||
71 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
72 | ||
73 | EvtParticle* t1=p->getDaug(0); | |
74 | ||
75 | EvtVector4R momt = t1->getP4(); | |
76 | EvtVector4R moms = p->getDaug(1)->getP4(); | |
77 | double masst = t1->mass(); | |
78 | ||
79 | EvtVector4R p4_parent=momt+moms; | |
80 | ||
81 | double m_parent=p4_parent.mass(); | |
82 | ||
83 | double norm=masst*masst/(m_parent*momt.d3mag()*momt.d3mag()); | |
84 | ||
85 | vertex(0,norm*t1->epsTensorParent(0).cont1(p4_parent)*p4_parent); | |
86 | vertex(1,norm*t1->epsTensorParent(1).cont1(p4_parent)*p4_parent); | |
87 | vertex(2,norm*t1->epsTensorParent(2).cont1(p4_parent)*p4_parent); | |
88 | vertex(3,norm*t1->epsTensorParent(3).cont1(p4_parent)*p4_parent); | |
89 | vertex(4,norm*t1->epsTensorParent(4).cont1(p4_parent)*p4_parent); | |
90 | ||
91 | return ; | |
92 | } | |
93 |