]>
Commit | Line | Data |
---|---|---|
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: EvtSll.cc | |
12 | // | |
13 | // Description: The decay of a scalar meson to two leptons, | |
14 | // or generally, two spin 1/2 particles. | |
15 | // E.g., B0 -> tau+ tau- | |
16 | // | |
17 | // Modification history: | |
18 | // | |
19 | // SHY April 23, 1997 Module created | |
20 | // | |
21 | //------------------------------------------------------------------------ | |
22 | // | |
23 | #include "EvtGenBase/EvtPatches.hh" | |
24 | #include <stdlib.h> | |
25 | #include <iostream> | |
26 | #include <string> | |
27 | #include "EvtGenBase/EvtParticle.hh" | |
28 | #include "EvtGenBase/EvtPDL.hh" | |
29 | #include "EvtGenBase/EvtGenKine.hh" | |
30 | #include "EvtGenModels/EvtSll.hh" | |
31 | #include "EvtGenBase/EvtDiracSpinor.hh" | |
32 | #include "EvtGenBase/EvtReport.hh" | |
33 | #include "EvtGenBase/EvtVector4C.hh" | |
34 | ||
35 | EvtSll::~EvtSll() {} | |
36 | ||
37 | std::string EvtSll::getName(){ | |
38 | ||
39 | return "SLL"; | |
40 | ||
41 | } | |
42 | ||
43 | ||
44 | EvtDecayBase* EvtSll::clone(){ | |
45 | ||
46 | return new EvtSll; | |
47 | ||
48 | } | |
49 | ||
50 | void EvtSll::init(){ | |
51 | ||
52 | // check that there are 0 arguments | |
53 | checkNArg(0); | |
54 | checkNDaug(2); | |
55 | ||
56 | checkSpinParent(EvtSpinType::SCALAR); | |
57 | ||
58 | checkSpinDaughter(0,EvtSpinType::DIRAC); | |
59 | checkSpinDaughter(1,EvtSpinType::DIRAC); | |
60 | ||
61 | } | |
62 | ||
63 | void EvtSll::decay(EvtParticle *p){ | |
64 | ||
65 | ||
66 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
67 | ||
68 | EvtParticle *l1, *l2; | |
69 | l1 = p->getDaug(0); | |
70 | l2 = p->getDaug(1); | |
71 | EvtVector4R p4_p; | |
72 | p4_p.set(p->mass(),0.0,0.0,0.0); | |
73 | ||
74 | EvtVector4C l11, l12, l21, l22; | |
75 | ||
76 | l11=EvtLeptonVACurrent(l1->spParent(0),l2->spParent(0)); | |
77 | l12=EvtLeptonVACurrent(l1->spParent(0),l2->spParent(1)); | |
78 | l21=EvtLeptonVACurrent(l1->spParent(1),l2->spParent(0)); | |
79 | l22=EvtLeptonVACurrent(l1->spParent(1),l2->spParent(1)); | |
80 | ||
81 | vertex(0,0,p4_p*l11); | |
82 | vertex(0,1,p4_p*l12); | |
83 | vertex(1,0,p4_p*l21); | |
84 | vertex(1,1,p4_p*l22); | |
85 | ||
86 | return; | |
87 | ||
88 | } | |
89 |