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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 | // | |
10 | // Module: EvtSVPCP.cc | |
11 | // | |
12 | // Description: Routine to decay scalar -> vectors+photon | |
13 | // including CP violation effects | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // Maurizio pierini Nov 11, 2003 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | // | |
21 | #include "EvtGenBase/EvtPatches.hh" | |
22 | #include <stdlib.h> | |
23 | #include "EvtGenBase/EvtParticle.hh" | |
24 | #include "EvtGenBase/EvtGenKine.hh" | |
25 | #include "EvtGenBase/EvtPDL.hh" | |
26 | #include "EvtGenBase/EvtVector4R.hh" | |
27 | #include "EvtGenBase/EvtVector4C.hh" | |
28 | #include "EvtGenBase/EvtTensor4C.hh" | |
29 | #include "EvtGenBase/EvtTensor3C.hh" | |
30 | #include "EvtGenBase/EvtReport.hh" | |
31 | #include "EvtGenBase/EvtComplex.hh" | |
32 | #include "EvtGenModels/EvtSVPCP.hh" | |
33 | #include "EvtGenBase/EvtId.hh" | |
34 | #include "EvtGenBase/EvtCPUtil.hh" | |
35 | #include <string> | |
36 | #include "EvtGenBase/EvtConst.hh" | |
37 | ||
38 | EvtSVPCP::~EvtSVPCP() {} | |
39 | ||
40 | std::string EvtSVPCP::getName(){ | |
41 | ||
42 | return "SVP_CP"; | |
43 | ||
44 | } | |
45 | ||
46 | ||
47 | EvtDecayBase* EvtSVPCP::clone(){ | |
48 | ||
49 | return new EvtSVPCP; | |
50 | ||
51 | } | |
52 | ||
53 | void EvtSVPCP::initProbMax(){ | |
54 | ||
55 | setProbMax(2*(getArg(3)*getArg(3)+getArg(5)*getArg(5))); | |
56 | ||
57 | } | |
58 | ||
59 | ||
60 | void EvtSVPCP::init(){ | |
61 | ||
62 | // check that there are 7 arguments | |
63 | checkNArg(7); | |
64 | checkNDaug(2); | |
65 | ||
66 | checkSpinParent(EvtSpinType::SCALAR); | |
67 | ||
68 | checkSpinDaughter(0,EvtSpinType::VECTOR); | |
69 | checkSpinDaughter(1,EvtSpinType::PHOTON); | |
70 | ||
71 | } | |
72 | ||
73 | void EvtSVPCP::decay( EvtParticle *p ){ | |
74 | ||
75 | static EvtId B0=EvtPDL::getId("B0"); | |
76 | static EvtId B0B=EvtPDL::getId("anti-B0"); | |
77 | ||
78 | double t; | |
79 | EvtId other_b; | |
80 | ||
81 | EvtCPUtil::OtherB(p,t,other_b); | |
82 | ||
83 | EvtComplex G1P,G1M, G1_T_even, G1_T_odd; | |
84 | ||
85 | double norm = getArg(3)*getArg(3)+getArg(5)*getArg(5); | |
86 | ||
87 | G1P=EvtComplex(getArg(3)*cos(getArg(4))/norm,getArg(3)*sin(getArg(4))/norm); | |
88 | G1M=EvtComplex(getArg(5)*cos(getArg(6))/norm,getArg(5)*sin(getArg(6))/norm); | |
89 | ||
90 | G1_T_even = (G1P+G1M)/sqrt(2.0); | |
91 | G1_T_odd = (G1P-G1M)/sqrt(2.0); | |
92 | ||
93 | EvtComplex lambda_km =EvtComplex(cos(-2*getArg(0)),sin(-2*getArg(0))); | |
94 | ||
95 | double cdmt=cos(getArg(1)*t/(2*EvtConst::c)); | |
96 | double sdmt=sin(getArg(1)*t/(2*EvtConst::c)); | |
97 | ||
98 | EvtComplex cG1_T_even,cG1_T_odd; | |
99 | ||
100 | if (other_b==B0B){ | |
101 | cG1_T_even = G1_T_even*(cdmt+lambda_km*EvtComplex(0.0,getArg(2)*sdmt)); | |
102 | cG1_T_odd = G1_T_odd*(cdmt-lambda_km*EvtComplex(0.0,getArg(2)*sdmt)); | |
103 | } | |
104 | if (other_b==B0){ | |
105 | cG1_T_even = G1_T_even*(cdmt+(1.0/lambda_km)*EvtComplex(0.0,getArg(2)*sdmt)); | |
106 | cG1_T_odd =-G1_T_odd*(cdmt-(1.0/lambda_km)*EvtComplex(0.0,getArg(2)*sdmt)); | |
107 | } | |
108 | ||
109 | EvtComplex hp, hm, h0; | |
110 | ||
111 | // This part is adopted from EvtSVVHel and since there is | |
112 | // a photon that can not have helicity 0 this is put in by | |
113 | // setting the h0 amplitude to 0. | |
114 | hm=(cG1_T_even-cG1_T_odd)/sqrt(2.0); | |
115 | hp=(cG1_T_even+cG1_T_odd)/sqrt(2.0); | |
116 | h0=EvtComplex(0.0,0.0); | |
117 | ||
118 | EvtParticle *v1,*ph; | |
119 | ||
120 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
121 | v1 = p->getDaug(0); | |
122 | ph = p->getDaug(1); | |
123 | EvtVector4R momv1 = v1->getP4(); | |
124 | EvtVector4R momph = ph->getP4(); | |
125 | ||
126 | EvtTensor4C d,g; | |
127 | ||
128 | g.setdiag(1.0,-1.0,-1.0,-1.0); | |
129 | ||
130 | EvtVector4R v,vp; | |
131 | ||
132 | v=momv1/momv1.d3mag(); | |
133 | vp=(momv1+momph)/(momv1+momph).mass(); | |
134 | ||
135 | d=((1.0/sqrt(3.0))*(h0-(hp+hm))*(-1.0/sqrt(3.0)))*g+ | |
136 | ((1.0/sqrt(2.0))*(hp-hm)*EvtComplex(0.0,1.0)*(sqrt(1.0/2.0)))*dual(directProd(v,vp))+ | |
137 | (sqrt(2.0/3.0)*(h0+0.5*(hp+hm))*sqrt(3.0/2.0))*(directProd(v,v)+(1.0/3.0)*g); | |
138 | ||
139 | EvtVector4C ep0,ep1,ep2; | |
140 | ||
141 | ep0=d.cont1(v1->eps(0).conj()); | |
142 | ep1=d.cont1(v1->eps(1).conj()); | |
143 | ep2=d.cont1(v1->eps(2).conj()); | |
144 | ||
145 | EvtVector4C ep20,ep21,ep22; | |
146 | ||
147 | ep20=ph->epsParentPhoton(0).conj(); | |
148 | ep21=ph->epsParentPhoton(1).conj(); | |
149 | ||
150 | vertex(0,0,ep0*ep20); | |
151 | vertex(0,1,ep0*ep21); | |
152 | ||
153 | vertex(1,0,ep1*ep20); | |
154 | vertex(1,1,ep1*ep21); | |
155 | ||
156 | vertex(2,0,ep2*ep20); | |
157 | vertex(2,1,ep2*ep21); | |
158 | ||
159 | ||
160 | return ; | |
161 | ||
162 | } | |
163 |