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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: EvtVVP.cc | |
12 | // | |
13 | // Description: The decay Vector -> Vector gamma | |
14 | // E.g., CHI1->PSI GAMMA | |
15 | // | |
16 | // Modification history: | |
17 | // | |
18 | // RYD September 5, 1997 Module created | |
19 | // | |
20 | //------------------------------------------------------------------------ | |
21 | // | |
22 | #include "EvtGenBase/EvtPatches.hh" | |
23 | #include <stdlib.h> | |
24 | #include <iostream> | |
25 | #include <string> | |
26 | #include "EvtGenBase/EvtVector3C.hh" | |
27 | #include "EvtGenBase/EvtParticle.hh" | |
28 | #include "EvtGenBase/EvtPDL.hh" | |
29 | #include "EvtGenBase/EvtGenKine.hh" | |
30 | #include "EvtGenBase/EvtVector4C.hh" | |
31 | #include "EvtGenModels/EvtVVP.hh" | |
32 | #include "EvtGenBase/EvtReport.hh" | |
33 | ||
34 | EvtVVP::~EvtVVP() {} | |
35 | ||
36 | std::string EvtVVP::getName(){ | |
37 | ||
38 | return "VVP"; | |
39 | ||
40 | } | |
41 | ||
42 | ||
43 | EvtDecayBase* EvtVVP::clone(){ | |
44 | ||
45 | return new EvtVVP; | |
46 | ||
47 | } | |
48 | ||
49 | void EvtVVP::init(){ | |
50 | ||
51 | // check that there are 8 arguments | |
52 | ||
53 | checkNArg(8); | |
54 | checkNDaug(2); | |
55 | ||
56 | checkSpinParent(EvtSpinType::VECTOR); | |
57 | checkSpinDaughter(0,EvtSpinType::VECTOR); | |
58 | checkSpinDaughter(1,EvtSpinType::PHOTON); | |
59 | } | |
60 | ||
61 | void EvtVVP::initProbMax(){ | |
62 | ||
63 | setProbMax(4.0); | |
64 | ||
65 | } | |
66 | ||
67 | void EvtVVP::decay(EvtParticle *p){ | |
68 | ||
69 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
70 | ||
71 | EvtParticle *v,*ph; | |
72 | ||
73 | v = p->getDaug(0); | |
74 | ph = p->getDaug(1); | |
75 | ||
76 | EvtVector3C epsp[3]; | |
77 | EvtVector3C epsv[3]; | |
78 | EvtVector3C epsph[2]; | |
79 | ||
80 | epsp[0]=p->eps(0).vec(); | |
81 | epsp[1]=p->eps(1).vec(); | |
82 | epsp[2]=p->eps(2).vec(); | |
83 | ||
84 | epsv[0]=v->eps(0).vec().conj(); | |
85 | epsv[1]=v->eps(1).vec().conj(); | |
86 | epsv[2]=v->eps(2).vec().conj(); | |
87 | ||
88 | epsph[0]=ph->epsParentPhoton(0).vec().conj(); | |
89 | epsph[1]=ph->epsParentPhoton(1).vec().conj(); | |
90 | ||
91 | int i,j,k; | |
92 | for(i=0;i<3;i++){ | |
93 | for(j=0;j<3;j++){ | |
94 | for(k=0;k<2;k++){ | |
95 | vertex(i,j,k,epsp[i].cross(epsv[j])*epsph[k]); | |
96 | } | |
97 | } | |
98 | } | |
99 | ||
100 | return; | |
101 | ||
102 | } | |
103 |