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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: EvtSVSCP.cc | |
12 | // | |
13 | // Description: Routine to decay scalar -> vectors scalar | |
14 | // and has CP violation. | |
15 | // | |
16 | // Modification history: | |
17 | // | |
18 | // RYD Febuary 10, 1997 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/EvtCPUtil.hh" | |
27 | #include "EvtGenBase/EvtVector4C.hh" | |
28 | #include "EvtGenBase/EvtPDL.hh" | |
29 | #include "EvtGenBase/EvtReport.hh" | |
30 | #include "EvtGenModels/EvtSVSCP.hh" | |
31 | #include <string> | |
32 | #include "EvtGenBase/EvtConst.hh" | |
33 | ||
34 | EvtSVSCP::~EvtSVSCP() {} | |
35 | ||
36 | std::string EvtSVSCP::getName(){ | |
37 | ||
38 | return "SVS_CP"; | |
39 | ||
40 | } | |
41 | ||
42 | ||
43 | EvtDecayBase* EvtSVSCP::clone(){ | |
44 | ||
45 | return new EvtSVSCP; | |
46 | ||
47 | } | |
48 | ||
49 | void EvtSVSCP::init(){ | |
50 | ||
51 | // check that there are 7 arguments | |
52 | checkNArg(7); | |
53 | checkNDaug(2); | |
54 | ||
55 | checkSpinParent(EvtSpinType::SCALAR); | |
56 | ||
57 | checkSpinDaughter(0,EvtSpinType::VECTOR); | |
58 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
59 | ||
60 | ||
61 | } | |
62 | ||
63 | ||
64 | void EvtSVSCP::initProbMax(){ | |
65 | ||
66 | //This is probably not quite right, but it should do as a start... | |
67 | //Anders | |
68 | ||
69 | setProbMax(2*(getArg(3)*getArg(3)+getArg(5)*getArg(5))); | |
70 | ||
71 | } | |
72 | ||
73 | ||
74 | void EvtSVSCP::decay( EvtParticle *p ){ | |
75 | ||
76 | //added by Lange Jan4,2000 | |
77 | static EvtId B0=EvtPDL::getId("B0"); | |
78 | static EvtId B0B=EvtPDL::getId("anti-B0"); | |
79 | ||
80 | EvtParticle *v; | |
81 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
82 | v = p->getDaug(0); | |
83 | EvtVector4R momv = v->getP4(); | |
84 | EvtVector4R moms = p->getDaug(1)->getP4(); | |
85 | double massv = v->mass(); | |
86 | double t; | |
87 | EvtId other_b; | |
88 | ||
89 | EvtCPUtil::OtherB(p,t,other_b); | |
90 | ||
91 | EvtComplex amp; | |
92 | ||
93 | EvtComplex A,Abar; | |
94 | ||
95 | A=EvtComplex(getArg(3)*cos(getArg(4)),getArg(3)*sin(getArg(4))); | |
96 | Abar=EvtComplex(getArg(5)*cos(getArg(6)),getArg(5)*sin(getArg(6))); | |
97 | ||
98 | if (other_b==B0B){ | |
99 | amp=A*cos(getArg(1)*t/(2*EvtConst::c))+ | |
100 | EvtComplex(cos(-2.0*getArg(0)),sin(-2.0*getArg(0)))* | |
101 | getArg(2)*EvtComplex(0.0,1.0)*Abar*sin(getArg(1)*t/(2*EvtConst::c)); | |
102 | } | |
103 | if (other_b==B0){ | |
104 | amp=A*EvtComplex(cos(2.0*getArg(0)),sin(2.0*getArg(0)))* | |
105 | EvtComplex(0.0,1.0)*sin(getArg(1)*t/(2*EvtConst::c))+ | |
106 | getArg(2)*Abar*cos(getArg(1)*t/(2*EvtConst::c)); | |
107 | } | |
108 | ||
109 | EvtVector4R p4_parent; | |
110 | ||
111 | p4_parent=momv+moms; | |
112 | ||
113 | double norm=massv/(momv.d3mag()*p4_parent.mass()); | |
114 | ||
115 | vertex(0,amp*norm*p4_parent*(v->epsParent(0))); | |
116 | vertex(1,amp*norm*p4_parent*(v->epsParent(1))); | |
117 | vertex(2,amp*norm*p4_parent*(v->epsParent(2))); | |
118 | ||
119 | return ; | |
120 | } | |
121 |