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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) 2002 Caltech | |
10 | // | |
11 | // Module: EvtKstarstargamma.cc | |
12 | // | |
13 | // Description: Routine for the decau B->K**gamma | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // Ryd November 15, 2002 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | // | |
21 | #include "EvtGenBase/EvtPatches.hh" | |
22 | #include <stdlib.h> | |
23 | #include "EvtGenBase/EvtParticle.hh" | |
24 | #include "EvtGenBase/EvtScalarParticle.hh" | |
25 | #include "EvtGenBase/EvtVectorParticle.hh" | |
26 | #include "EvtGenBase/EvtPhotonParticle.hh" | |
27 | #include "EvtGenBase/EvtTensorParticle.hh" | |
28 | #include "EvtGenBase/EvtGenKine.hh" | |
29 | #include "EvtGenBase/EvtPDL.hh" | |
30 | #include "EvtGenBase/EvtVector4C.hh" | |
31 | #include "EvtGenBase/EvtVector4R.hh" | |
32 | #include "EvtGenBase/EvtReport.hh" | |
33 | #include "EvtGenModels/EvtKstarstargamma.hh" | |
34 | #include <string> | |
35 | #include "EvtGenBase/EvtEvalHelAmp.hh" | |
36 | #include "EvtGenBase/EvtPropBreitWignerRel.hh" | |
37 | #include "EvtGenBase/EvtTwoBodyVertex.hh" | |
38 | ||
39 | EvtKstarstargamma::~EvtKstarstargamma() {} | |
40 | ||
41 | std::string EvtKstarstargamma::getName(){ | |
42 | ||
43 | return "KSTARSTARGAMMA"; | |
44 | ||
45 | } | |
46 | ||
47 | ||
48 | EvtDecayBase* EvtKstarstargamma::clone(){ | |
49 | ||
50 | return new EvtKstarstargamma; | |
51 | ||
52 | } | |
53 | ||
54 | void EvtKstarstargamma::init(){ | |
55 | ||
56 | // check that there are 0 arguments | |
57 | checkNArg(0); | |
58 | ||
59 | // check that there are 3 daughters | |
60 | checkNDaug(3); | |
61 | ||
62 | // check the parent and daughter spins | |
63 | checkSpinParent(EvtSpinType::SCALAR); | |
64 | checkSpinDaughter(0,EvtSpinType::SCALAR); | |
65 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
66 | checkSpinDaughter(2,EvtSpinType::PHOTON); | |
67 | } | |
68 | ||
69 | void EvtKstarstargamma::initProbMax() { | |
70 | ||
71 | //setProbMax(1.0); | |
72 | ||
73 | } | |
74 | ||
75 | void EvtKstarstargamma::decay( EvtParticle *p){ | |
76 | ||
77 | /* | |
78 | ||
79 | The EvtEvalHelAmp is completely broken... | |
80 | ||
81 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
82 | ||
83 | EvtParticle* kaon = p->getDaug(0); | |
84 | EvtParticle* pion = p->getDaug(1); | |
85 | EvtParticle* photon = p->getDaug(2); | |
86 | ||
87 | ||
88 | EvtComplexPtrPtr Hd1=new EvtComplexPtr[5]; | |
89 | Hd1[0]=new EvtComplex[2]; | |
90 | Hd1[1]=new EvtComplex[2]; | |
91 | Hd1[2]=new EvtComplex[2]; | |
92 | Hd1[3]=new EvtComplex[2]; | |
93 | Hd1[4]=new EvtComplex[2]; | |
94 | ||
95 | Hd1[0][0]=0.0; | |
96 | Hd1[0][1]=0.0; | |
97 | Hd1[1][0]=0.0; | |
98 | Hd1[1][1]=0.0; | |
99 | Hd1[2][0]=0.0; | |
100 | Hd1[2][1]=0.0; | |
101 | Hd1[3][0]=0.0; | |
102 | Hd1[3][1]=1.0; | |
103 | Hd1[4][0]=0.0; | |
104 | Hd1[4][1]=0.0; | |
105 | ||
106 | EvtEvalHelAmp d1(EvtSpinType::SCALAR,EvtSpinType::TENSOR, | |
107 | EvtSpinType::PHOTON,Hd1); | |
108 | ||
109 | EvtScalarParticle theB; | |
110 | ||
111 | theB.init(p->getId(),p->getP4Restframe()); | |
112 | ||
113 | EvtVector4R theKstarP4=kaon->getP4()+pion->getP4(); | |
114 | ||
115 | EvtTensorParticle theKstar; | |
116 | theKstar.init(EvtPDL::getId(std::string("K_2*0")),theKstarP4); | |
117 | ||
118 | EvtPhotonParticle thePhoton; | |
119 | thePhoton.init(EvtPDL::getId(std::string("K_2*0")),photon->getP4()); | |
120 | ||
121 | theKstar.addDaug(&theB); | |
122 | thePhoton.addDaug(&theB); | |
123 | ||
124 | EvtAmp amp1; | |
125 | ||
126 | d1.evalAmp(&theB,amp1); | |
127 | ||
128 | EvtComplexPtrPtr Hd2=new EvtComplexPtr[1]; | |
129 | Hd2[0]=new EvtComplex[1]; | |
130 | ||
131 | Hd2[0][0]=1.0; | |
132 | ||
133 | ||
134 | EvtEvalHelAmp d2(EvtSpinType::TENSOR,EvtSpinType::SCALAR, | |
135 | EvtSpinType::SCALAR,Hd2); | |
136 | ||
137 | ||
138 | EvtVector4R theKstarP4boost(theKstarP4.get(0),-theKstarP4.get(1),-theKstarP4.get(2),-theKstarP4.get(3)); | |
139 | ||
140 | EvtScalarParticle theKaon; | |
141 | theKaon.init(EvtPDL::getId(std::string("K+")),boostTo(kaon->getP4(),theKstarP4boost)); | |
142 | ||
143 | EvtScalarParticle thePion; | |
144 | thePion.init(EvtPDL::getId(std::string("pi+")),boostTo(pion->getP4(),theKstarP4boost)); | |
145 | ||
146 | theKaon.addDaug(&theKstar); | |
147 | thePion.addDaug(&theKstar); | |
148 | ||
149 | // Calculate the propagator | |
150 | ||
151 | double m = theKstarP4.mass(); | |
152 | EvtTwoBodyVertex v(0.5,0.14,1.4,2); | |
153 | EvtTwoBodyKine v1(0.5,0.14,m); | |
154 | EvtPropBreitWignerRel prop(1.4,0.2); | |
155 | ||
156 | // Mass-dependent width correction and amplitude calculation | |
157 | ||
158 | double width = prop.g0() * v.widthFactor(v1); | |
159 | prop.set_g0(width); | |
160 | EvtComplex bwamp = prop.evaluate(m); | |
161 | ||
162 | ||
163 | EvtAmp amp2; | |
164 | ||
165 | d2.evalAmp(&theKstar,amp2); | |
166 | ||
167 | vertex(0,bwamp*(amp1._amp[0]*amp2._amp[0]+ | |
168 | amp1._amp[1]*amp2._amp[1]+ | |
169 | amp1._amp[2]*amp2._amp[2]+ | |
170 | amp1._amp[3]*amp2._amp[3]+ | |
171 | amp1._amp[4]*amp2._amp[4])); | |
172 | ||
173 | vertex(1,bwamp*(amp1._amp[5]*amp2._amp[0]+ | |
174 | amp1._amp[6]*amp2._amp[1]+ | |
175 | amp1._amp[7]*amp2._amp[2]+ | |
176 | amp1._amp[8]*amp2._amp[3]+ | |
177 | amp1._amp[9]*amp2._amp[4])); | |
178 | ||
179 | */ | |
180 | ||
181 | return; | |
182 | } | |
183 | ||
184 | ||
185 | ||
186 | ||
187 |