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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) 2000 Caltech, UCSB | |
10 | // | |
11 | // Module: EvtbTosllScalarAmp.cc | |
12 | // | |
13 | // Description: Routine to implement bTosll decays to pseudo-scalar | |
14 | // mesons. | |
15 | // | |
16 | // Modification history: | |
17 | // | |
18 | // Ryd January 5,2000 Module created | |
19 | // | |
20 | //------------------------------------------------------------------------ | |
21 | // | |
22 | #include "EvtGenBase/EvtPatches.hh" | |
23 | #include "EvtGenBase/EvtConst.hh" | |
24 | #include "EvtGenBase/EvtPatches.hh" | |
25 | #include "EvtGenBase/EvtParticle.hh" | |
26 | #include "EvtGenBase/EvtGenKine.hh" | |
27 | #include "EvtGenBase/EvtPDL.hh" | |
28 | #include "EvtGenBase/EvtReport.hh" | |
29 | #include "EvtGenBase/EvtVector4C.hh" | |
30 | #include "EvtGenBase/EvtTensor4C.hh" | |
31 | #include "EvtGenBase/EvtDiracSpinor.hh" | |
32 | #include "EvtGenModels/EvtbTosllScalarAmp.hh" | |
33 | #include "EvtGenBase/EvtId.hh" | |
34 | #include "EvtGenBase/EvtIdSet.hh" | |
35 | #include "EvtGenBase/EvtAmp.hh" | |
36 | #include "EvtGenModels/EvtbTosllAmp.hh" | |
37 | #include "EvtGenModels/EvtbTosllFF.hh" | |
38 | ||
39 | void EvtbTosllScalarAmp::CalcAmp( EvtParticle *parent, | |
40 | EvtAmp& amp, | |
41 | EvtbTosllFF *formFactors ) { | |
42 | ||
43 | //Add the lepton and neutrino 4 momenta to find q2 | |
44 | ||
45 | EvtVector4R q = parent->getDaug(1)->getP4() | |
46 | + parent->getDaug(2)->getP4(); | |
47 | double q2 = (q.mass2()); | |
48 | ||
49 | double fp(0.),f0(0.),ft(0.); | |
50 | double mesonmass = parent->getDaug(0)->mass(); | |
51 | double parentmass = parent->mass(); | |
52 | ||
53 | formFactors->getScalarFF(parent->getId(), | |
54 | parent->getDaug(0)->getId(), | |
55 | q2, | |
56 | mesonmass, | |
57 | fp,f0,ft); | |
58 | ||
59 | EvtId daught = parent->getDaug(0)->getId(); | |
60 | bool btod = false; | |
61 | bool nnlo = true; | |
62 | if (daught == EvtPDL::getId(std::string("pi+")) || | |
63 | daught == EvtPDL::getId(std::string("pi-")) || | |
64 | daught == EvtPDL::getId(std::string("pi0")) || | |
65 | daught == EvtPDL::getId(std::string("eta")) || | |
66 | daught == EvtPDL::getId(std::string("eta'")) | |
67 | ) btod = true; | |
68 | ||
69 | ||
70 | EvtVector4R p4b; | |
71 | p4b.set(parent->mass(),0.0,0.0,0.0); | |
72 | ||
73 | EvtVector4C l11,l12; | |
74 | EvtVector4C l21,l22; | |
75 | ||
76 | EvtVector4C a11,a12; | |
77 | EvtVector4C a21,a22; | |
78 | ||
79 | EvtId l_num = parent->getDaug(1)->getId(); | |
80 | ||
81 | EvtVector4C T1,T2; | |
82 | ||
83 | EvtVector4R phat=p4b/parentmass; | |
84 | EvtVector4R qhat=q/parentmass; | |
85 | ||
86 | EvtComplex c7eff = EvtbTosllAmp::GetC7Eff(q2,nnlo); | |
87 | EvtComplex c9eff = EvtbTosllAmp::GetC9Eff(q2,nnlo,btod); | |
88 | EvtComplex c10eff = EvtbTosllAmp::GetC10Eff(q2,nnlo); | |
89 | ||
90 | //double mbhat=1; | |
91 | double mbhat=4.4/(parentmass); | |
92 | //double mkhat = 0.15; | |
93 | double mkhat=mesonmass/(parentmass); | |
94 | double shat=q2/(parentmass*parentmass); | |
95 | ||
96 | double fm=(f0-fp)*(1-mkhat*mkhat)/shat; | |
97 | ||
98 | EvtComplex aprime; | |
99 | aprime = c9eff*fp+2.0*mbhat*c7eff*ft/(1+mkhat); | |
100 | EvtComplex bprime; | |
101 | bprime = c9eff*fm-2*mbhat*c7eff*ft*(1-mkhat)/shat; | |
102 | ||
103 | EvtComplex cprime; | |
104 | cprime = c10eff*fp; | |
105 | EvtComplex dprime; | |
106 | dprime = c10eff*fm; | |
107 | ||
108 | static EvtIdSet leptons("e-","mu-","tau-"); | |
109 | static EvtIdSet antileptons("e+","mu+","tau+"); | |
110 | ||
111 | if (leptons.contains(l_num)){ | |
112 | ||
113 | T1=aprime*phat+bprime*qhat; | |
114 | T2=cprime*phat+dprime*qhat; | |
115 | ||
116 | l11=EvtLeptonVCurrent(parent->getDaug(1)->spParent(0), | |
117 | parent->getDaug(2)->spParent(0)); | |
118 | l21=EvtLeptonVCurrent(parent->getDaug(1)->spParent(1), | |
119 | parent->getDaug(2)->spParent(0)); | |
120 | l12=EvtLeptonVCurrent(parent->getDaug(1)->spParent(0), | |
121 | parent->getDaug(2)->spParent(1)); | |
122 | l22=EvtLeptonVCurrent(parent->getDaug(1)->spParent(1), | |
123 | parent->getDaug(2)->spParent(1)); | |
124 | a11=EvtLeptonACurrent(parent->getDaug(1)->spParent(0), | |
125 | parent->getDaug(2)->spParent(0)); | |
126 | a21=EvtLeptonACurrent(parent->getDaug(1)->spParent(1), | |
127 | parent->getDaug(2)->spParent(0)); | |
128 | a12=EvtLeptonACurrent(parent->getDaug(1)->spParent(0), | |
129 | parent->getDaug(2)->spParent(1)); | |
130 | a22=EvtLeptonACurrent(parent->getDaug(1)->spParent(1), | |
131 | parent->getDaug(2)->spParent(1)); | |
132 | } | |
133 | else{ | |
134 | if (antileptons.contains(l_num)){ | |
135 | ||
136 | T1=aprime*phat+bprime*qhat; | |
137 | T2=cprime*phat+dprime*qhat; | |
138 | ||
139 | l11=EvtLeptonVCurrent(parent->getDaug(1)->spParent(1), | |
140 | parent->getDaug(2)->spParent(1)); | |
141 | l21=EvtLeptonVCurrent(parent->getDaug(1)->spParent(0), | |
142 | parent->getDaug(2)->spParent(1)); | |
143 | l12=EvtLeptonVCurrent(parent->getDaug(1)->spParent(1), | |
144 | parent->getDaug(2)->spParent(0)); | |
145 | l22=EvtLeptonVCurrent(parent->getDaug(1)->spParent(0), | |
146 | parent->getDaug(2)->spParent(0)); | |
147 | ||
148 | a11=EvtLeptonACurrent(parent->getDaug(1)->spParent(1), | |
149 | parent->getDaug(2)->spParent(1)); | |
150 | a21=EvtLeptonACurrent(parent->getDaug(1)->spParent(0), | |
151 | parent->getDaug(2)->spParent(1)); | |
152 | a12=EvtLeptonACurrent(parent->getDaug(1)->spParent(1), | |
153 | parent->getDaug(2)->spParent(0)); | |
154 | a22=EvtLeptonACurrent(parent->getDaug(1)->spParent(0), | |
155 | parent->getDaug(2)->spParent(0)); | |
156 | ||
157 | } | |
158 | else{ | |
159 | report(ERROR,"EvtGen") << "Wrong lepton number\n"; | |
160 | } | |
161 | } | |
162 | ||
163 | amp.vertex(0,0,l11*T1+a11*T2); | |
164 | amp.vertex(0,1,l12*T1+a12*T2); | |
165 | amp.vertex(1,0,l21*T1+a21*T2); | |
166 | amp.vertex(1,1,l22*T1+a22*T2); | |
167 | ||
168 | } | |
169 | ||
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