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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: EvtSTSCP.cc | |
12 | // | |
13 | // Description: Routine to decay scalar -> tensor scalar | |
14 | // and has CP violation. | |
15 | // | |
16 | // Modification history: | |
17 | // | |
18 | // RYD June 19, 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/EvtTensor4C.hh" | |
28 | #include "EvtGenBase/EvtVector4C.hh" | |
29 | #include "EvtGenBase/EvtPDL.hh" | |
30 | #include "EvtGenBase/EvtReport.hh" | |
31 | #include "EvtGenModels/EvtSTSCP.hh" | |
32 | #include "EvtGenBase/EvtId.hh" | |
33 | #include <string> | |
34 | #include "EvtGenBase/EvtConst.hh" | |
35 | ||
36 | EvtSTSCP::~EvtSTSCP() {} | |
37 | ||
38 | std::string EvtSTSCP::getName(){ | |
39 | ||
40 | return "STS_CP"; | |
41 | ||
42 | } | |
43 | ||
44 | void EvtSTSCP::initProbMax(){ | |
45 | ||
46 | //This is probably not quite right, but it should do as a start... | |
47 | //Anders | |
48 | ||
49 | setProbMax(20*(getArg(3)*getArg(3)+getArg(5)*getArg(5))); | |
50 | ||
51 | } | |
52 | ||
53 | EvtDecayBase* EvtSTSCP::clone(){ | |
54 | ||
55 | return new EvtSTSCP; | |
56 | ||
57 | } | |
58 | ||
59 | void EvtSTSCP::init(){ | |
60 | ||
61 | // check that there are 7 arguments | |
62 | checkNArg(7); | |
63 | checkNDaug(2); | |
64 | ||
65 | checkSpinParent(EvtSpinType::SCALAR); | |
66 | ||
67 | checkSpinDaughter(0,EvtSpinType::TENSOR); | |
68 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
69 | ||
70 | } | |
71 | ||
72 | ||
73 | void EvtSTSCP::decay( EvtParticle *p){ | |
74 | ||
75 | //added by Lange Jan4,2000 | |
76 | static EvtId B0=EvtPDL::getId("B0"); | |
77 | static EvtId B0B=EvtPDL::getId("anti-B0"); | |
78 | ||
79 | double t; | |
80 | EvtId other_b; | |
81 | ||
82 | EvtParticle *t1; | |
83 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
84 | t1 = p->getDaug(0); | |
85 | EvtVector4R momt = t1->getP4(); | |
86 | EvtVector4R moms = p->getDaug(1)->getP4(); | |
87 | double masst = t1->mass(); | |
88 | ||
0ca57c2f | 89 | EvtCPUtil::getInstance()->OtherB(p,t,other_b,0.5); |
da0e9ce3 | 90 | |
91 | double m_parent = p->mass(); | |
92 | ||
93 | EvtComplex amp; | |
94 | ||
95 | EvtComplex A,Abar; | |
96 | ||
97 | A=EvtComplex(getArg(3)*cos(getArg(4)),getArg(3)*sin(getArg(4))); | |
98 | Abar=EvtComplex(getArg(5)*cos(getArg(6)),getArg(5)*sin(getArg(6))); | |
99 | ||
100 | if (other_b==B0B){ | |
101 | amp=A*cos(getArg(1)*t/(2*EvtConst::c))+ | |
102 | EvtComplex(cos(-2.0*getArg(0)),sin(-2.0*getArg(0)))* | |
103 | getArg(2)*EvtComplex(0.0,1.0)*Abar*sin(getArg(1)*t/(2*EvtConst::c)); | |
104 | } | |
105 | if (other_b==B0){ | |
106 | amp=A*EvtComplex(cos(2.0*getArg(0)),sin(2.0*getArg(0)))* | |
107 | EvtComplex(0.0,1.0)*sin(getArg(1)*t/(2*EvtConst::c))+ | |
108 | getArg(2)*Abar*cos(getArg(1)*t/(2*EvtConst::c)); | |
109 | } | |
110 | ||
111 | EvtVector4R p4_parent; | |
112 | ||
113 | p4_parent=momt+moms; | |
114 | ||
115 | double norm=masst*masst/(m_parent*momt.d3mag()*momt.d3mag()); | |
116 | ||
117 | ||
118 | vertex(0,amp*norm*t1->epsTensorParent(0).cont1(p4_parent)*p4_parent); | |
119 | vertex(1,amp*norm*t1->epsTensorParent(1).cont1(p4_parent)*p4_parent); | |
120 | vertex(2,amp*norm*t1->epsTensorParent(2).cont1(p4_parent)*p4_parent); | |
121 | vertex(3,amp*norm*t1->epsTensorParent(3).cont1(p4_parent)*p4_parent); | |
122 | vertex(4,amp*norm*t1->epsTensorParent(4).cont1(p4_parent)*p4_parent); | |
123 | ||
124 | return ; | |
125 | } | |
126 | ||
0ca57c2f | 127 | std::string EvtSTSCP::getParamName(int i) { |
128 | switch(i) { | |
129 | case 0: | |
130 | return "weakPhase"; | |
131 | case 1: | |
132 | return "deltaM"; | |
133 | case 2: | |
134 | return "finalStateCP"; | |
135 | case 3: | |
136 | return "Af"; | |
137 | case 4: | |
138 | return "AfPhase"; | |
139 | case 5: | |
140 | return "Abarf"; | |
141 | case 6: | |
142 | return "AbarfPhase"; | |
143 | default: | |
144 | return ""; | |
145 | } | |
146 | } | |
147 | ||
148 | std::string EvtSTSCP::getParamDefault(int i) { | |
149 | switch(i) { | |
150 | case 3: | |
151 | return "1.0"; | |
152 | case 4: | |
153 | return "0.0"; | |
154 | case 5: | |
155 | return "1.0"; | |
156 | case 6: | |
157 | return "0.0"; | |
158 | default: | |
159 | return ""; | |
160 | } | |
161 | } |