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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: EvtBTo3piCP.cc | |
12 | // | |
13 | // Description: Routine to decay B->pi+ pi- pi0 | |
14 | // and has CP violation. | |
15 | // | |
16 | // Modification history: | |
17 | // | |
18 | // RYD/VERSILLE March 2, 1997 Module created | |
19 | // | |
20 | //------------------------------------------------------------------------ | |
21 | // | |
22 | #include "EvtGenBase/EvtPatches.hh" | |
23 | #include <stdlib.h> | |
24 | #include "EvtGenBase/EvtParticle.hh" | |
25 | #include "EvtGenBase/EvtCPUtil.hh" | |
26 | #include "EvtGenBase/EvtPDL.hh" | |
27 | #include "EvtGenBase/EvtReport.hh" | |
28 | #include "EvtGenModels/EvtBTo3piCP.hh" | |
29 | #include "EvtGenBase/EvtId.hh" | |
30 | #include <string> | |
31 | #include "EvtGenBase/EvtConst.hh" | |
32 | ||
33 | #ifdef WIN32 | |
34 | extern "C" { | |
35 | extern void __stdcall EVT3PIONS(double *,int *,double *, | |
36 | double *,double *,double *,double *, | |
37 | double *,double *,double *); | |
38 | } | |
39 | #else | |
40 | extern "C" { | |
41 | extern void evt3pions_(double *,int *,double *, | |
42 | double *,double *,double *,double *, | |
43 | double *,double *,double *); | |
44 | } | |
45 | #endif | |
46 | ||
47 | EvtBTo3piCP::~EvtBTo3piCP() {} | |
48 | ||
49 | ||
50 | std::string EvtBTo3piCP::getName(){ | |
51 | ||
52 | return "BTO3PI_CP"; | |
53 | ||
54 | } | |
55 | ||
56 | ||
57 | EvtDecayBase* EvtBTo3piCP::clone(){ | |
58 | ||
59 | return new EvtBTo3piCP; | |
60 | ||
61 | } | |
62 | ||
63 | void EvtBTo3piCP::init(){ | |
64 | ||
65 | // check that there are 2 arguments | |
66 | checkNArg(2); | |
67 | checkNDaug(3); | |
68 | ||
69 | checkSpinParent(EvtSpinType::SCALAR); | |
70 | ||
71 | checkSpinDaughter(0,EvtSpinType::SCALAR); | |
72 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
73 | checkSpinDaughter(2,EvtSpinType::SCALAR); | |
74 | } | |
75 | ||
76 | ||
77 | ||
78 | void EvtBTo3piCP::initProbMax(){ | |
79 | ||
0ca57c2f | 80 | // perform common blocks initialization before |
81 | // first use | |
82 | double alpha=getArg(1); | |
83 | int iset; | |
84 | ||
85 | iset=10000; | |
86 | ||
87 | double p4piplus[4],p4piminus[4],p4gamm1[4],p4gamm2[4]; | |
88 | ||
89 | double realA,imgA,realbarA,imgbarA; | |
90 | ||
91 | #ifdef WIN32 | |
92 | EVT3PIONS(&alpha,&iset,p4piplus,p4piminus,p4gamm1,p4gamm2, | |
93 | &realA,&imgA,&realbarA,&imgbarA); | |
94 | #else | |
95 | evt3pions_(&alpha,&iset,p4piplus,p4piminus,p4gamm1,p4gamm2, | |
96 | &realA,&imgA,&realbarA,&imgbarA); | |
97 | #endif | |
98 | ||
da0e9ce3 | 99 | setProbMax(1.5); |
100 | ||
101 | } | |
102 | ||
103 | void EvtBTo3piCP::decay( EvtParticle *p){ | |
104 | ||
105 | //added by Lange Jan4,2000 | |
106 | static EvtId B0=EvtPDL::getId("B0"); | |
107 | static EvtId B0B=EvtPDL::getId("anti-B0"); | |
108 | ||
109 | double t; | |
110 | EvtId other_b; | |
111 | ||
0ca57c2f | 112 | EvtCPUtil::getInstance()->OtherB(p,t,other_b,0.5); |
da0e9ce3 | 113 | |
114 | EvtParticle *pip,*pim,*pi0; | |
115 | ||
116 | p->makeDaughters(getNDaug(),getDaugs()); | |
117 | ||
118 | // p->init_daug(SCALAR,&pip,SCALAR,&pim,SCALAR,&pi0); | |
119 | pip=p->getDaug(0); | |
120 | pim=p->getDaug(1); | |
121 | pi0=p->getDaug(2); | |
122 | ||
123 | EvtVector4R p4[3]; | |
124 | ||
125 | double dm=getArg(0); | |
126 | double alpha=getArg(1); | |
127 | int iset; | |
128 | ||
0ca57c2f | 129 | iset=0; |
da0e9ce3 | 130 | |
131 | double p4piplus[4],p4piminus[4],p4gamm1[4],p4gamm2[4]; | |
132 | ||
133 | double realA,imgA,realbarA,imgbarA; | |
134 | ||
135 | #ifdef WIN32 | |
136 | EVT3PIONS(&alpha,&iset,p4piplus,p4piminus,p4gamm1,p4gamm2, | |
137 | &realA,&imgA,&realbarA,&imgbarA); | |
138 | #else | |
139 | evt3pions_(&alpha,&iset,p4piplus,p4piminus,p4gamm1,p4gamm2, | |
140 | &realA,&imgA,&realbarA,&imgbarA); | |
141 | #endif | |
142 | ||
143 | p4[0].set(p4piplus[3],p4piplus[0],p4piplus[1],p4piplus[2]); | |
144 | p4[1].set(p4piminus[3],p4piminus[0],p4piminus[1],p4piminus[2]); | |
145 | p4[2].set(p4gamm1[3]+p4gamm2[3],p4gamm1[0]+p4gamm2[0], | |
146 | p4gamm1[1]+p4gamm2[1],p4gamm1[2]+p4gamm2[2]); | |
147 | ||
148 | if (pip->getId()==EvtPDL::getId("pi+")) { | |
149 | pip->init( getDaug(0), p4[0] ); | |
150 | pim->init( getDaug(1), p4[1] ); | |
151 | } | |
152 | else { | |
153 | pip->init( getDaug(0), p4[1] ); | |
154 | pim->init( getDaug(1), p4[0] ); | |
155 | } | |
156 | ||
157 | pi0->init( getDaug(2), p4[2] ); | |
158 | ||
159 | EvtComplex amp; | |
160 | ||
161 | EvtComplex A(realA,imgA); | |
162 | EvtComplex Abar(realbarA,imgbarA); | |
163 | ||
164 | if (other_b==B0B){ | |
165 | amp=A*cos(dm*t/(2*EvtConst::c))+ | |
166 | EvtComplex(0.,1.)*Abar*sin(dm*t/(2*EvtConst::c)); | |
167 | } | |
168 | if (other_b==B0){ | |
169 | amp=Abar*cos(dm*t/(2*EvtConst::c))+ | |
170 | EvtComplex(0.,1.)*A*sin(dm*t/(2*EvtConst::c)); | |
171 | } | |
172 | ||
173 | vertex(amp); | |
174 | ||
175 | return ; | |
176 | } | |
177 |