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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: EvtVSS.cc | |
12 | // | |
13 | // Description: Routine to decay vector-> scalar 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/EvtPDL.hh" | |
26 | #include "EvtGenBase/EvtVector4C.hh" | |
27 | #include "EvtGenBase/EvtVector4R.hh" | |
28 | #include "EvtGenBase/EvtReport.hh" | |
29 | #include "EvtGenModels/EvtVSS.hh" | |
30 | #include <string> | |
31 | ||
32 | EvtVSS::~EvtVSS() {} | |
33 | ||
34 | std::string EvtVSS::getName(){ | |
35 | ||
36 | return "VSS"; | |
37 | ||
38 | } | |
39 | ||
40 | ||
41 | EvtDecayBase* EvtVSS::clone(){ | |
42 | ||
43 | return new EvtVSS; | |
44 | ||
45 | } | |
46 | ||
47 | void EvtVSS::init(){ | |
48 | ||
49 | // check that there are 0 arguments | |
50 | checkNArg(0); | |
51 | ||
52 | // check that there are 2 daughters | |
53 | checkNDaug(2); | |
54 | ||
55 | // check the parent and daughter spins | |
56 | checkSpinParent(EvtSpinType::VECTOR); | |
57 | checkSpinDaughter(0,EvtSpinType::SCALAR); | |
58 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
59 | } | |
60 | ||
61 | void EvtVSS::initProbMax() { | |
62 | ||
63 | setProbMax(1.0); | |
64 | ||
65 | } | |
66 | ||
67 | void EvtVSS::decay( EvtParticle *p){ | |
68 | ||
69 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
70 | ||
71 | EvtVector4R pDaug = p->getDaug(0)->getP4(); | |
72 | ||
73 | double norm=1.0/pDaug.d3mag(); | |
74 | ||
75 | for (int i=0; i<3; i++) vertex(i,norm*pDaug*(p->eps(i))); | |
76 | ||
77 | return; | |
78 | } | |
79 |