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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: EvtBtoKpiCPiso.cc | |
12 | // | |
13 | // Description: Routine to decay B -> K pi with isospin amplitudes | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // RYD/NK Febuary 7, 1998 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/EvtReport.hh" | |
27 | #include "EvtGenModels/EvtBtoKpiCPiso.hh" | |
28 | #include <string> | |
29 | ||
30 | EvtBtoKpiCPiso::~EvtBtoKpiCPiso() {} | |
31 | ||
32 | std::string EvtBtoKpiCPiso::getName(){ | |
33 | ||
34 | return "BTOKPI_CP_ISO"; | |
35 | ||
36 | } | |
37 | ||
38 | ||
39 | EvtDecayBase* EvtBtoKpiCPiso::clone(){ | |
40 | ||
41 | return new EvtBtoKpiCPiso; | |
42 | ||
43 | } | |
44 | ||
45 | ||
46 | void EvtBtoKpiCPiso::init(){ | |
47 | ||
48 | // check that there are 15 arguments | |
49 | checkNArg(15); | |
50 | checkNDaug(2); | |
51 | ||
52 | checkSpinParent(EvtSpinType::SCALAR); | |
53 | ||
54 | checkSpinDaughter(0,EvtSpinType::SCALAR); | |
55 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
56 | } | |
57 | ||
58 | ||
59 | void EvtBtoKpiCPiso::initProbMax() { | |
60 | ||
61 | //this might need to be revised | |
62 | ||
63 | //added by Lange Jan4,2000 | |
64 | static EvtId PI0=EvtPDL::getId("pi0"); | |
65 | static EvtId PIP=EvtPDL::getId("pi+"); | |
66 | static EvtId PIM=EvtPDL::getId("pi+"); | |
67 | static EvtId K0=EvtPDL::getId("K0"); | |
68 | static EvtId KB=EvtPDL::getId("anti-K0"); | |
69 | static EvtId KP=EvtPDL::getId("K+"); | |
70 | static EvtId KM=EvtPDL::getId("K-"); | |
71 | ||
72 | if (((getDaug(0)==PI0) && (getDaug(1)==KP)) || ((getDaug(0)==KP) && (getDaug(1)==PI0))) { | |
73 | setProbMax(2.0*(getArg(2)*getArg(2) + getArg(10)*getArg(10))); | |
74 | } | |
75 | ||
76 | if (((getDaug(0)==PI0) && (getDaug(1)==KM)) || ((getDaug(0)==KM) && (getDaug(1)==PI0))) { | |
77 | setProbMax( 2.0*(getArg(4)*getArg(4) + getArg(12)*getArg(12))); | |
78 | } | |
79 | ||
80 | if (((getDaug(0)==PIP) && (getDaug(1)==K0)) || ((getDaug(0)==K0) && (getDaug(1)==PIP))) { | |
81 | setProbMax( 4.0*(getArg(6)*getArg(6) + getArg(10)*getArg(10))); | |
82 | } | |
83 | ||
84 | if (((getDaug(0)==PIM) && (getDaug(1)==KB)) || ((getDaug(0)==KB) && (getDaug(1)==PIM))) { | |
85 | setProbMax( 4.0*(getArg(8)*getArg(8) + getArg(12)*getArg(12))); | |
86 | } | |
87 | ||
88 | if (((getDaug(0)==PI0) && (getDaug(1)==K0)) || ((getDaug(0)==K0) && (getDaug(1)==PI0))) { | |
89 | setProbMax( 2.0*(getArg(2)*getArg(2) + getArg(10)*getArg(10))); | |
90 | } | |
91 | ||
92 | if (((getDaug(0)==PI0) && (getDaug(1)==KB)) || ((getDaug(0)==KB) && (getDaug(1)==PI0))) { | |
93 | setProbMax( 2.0*(getArg(4)*getArg(4) + getArg(12)*getArg(12))); | |
94 | } | |
95 | ||
96 | if (((getDaug(0)==PIM) && (getDaug(1)==KP)) || ((getDaug(0)==KP) && (getDaug(1)==PIM))) { | |
97 | setProbMax( 4.0*(getArg(6)*getArg(6) + getArg(10)*getArg(10))); | |
98 | } | |
99 | ||
100 | if (((getDaug(0)==PIP) && (getDaug(1)==KM)) || ((getDaug(0)==KM) && (getDaug(1)==PIP))) { | |
101 | setProbMax( 4.0*(getArg(8)*getArg(8) + getArg(12)*getArg(12))); | |
102 | } | |
103 | } | |
104 | ||
105 | void EvtBtoKpiCPiso::decay( EvtParticle *p ){ | |
106 | ||
107 | ||
108 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
109 | //added by Lange Jan4,2000 | |
110 | static EvtId PI0=EvtPDL::getId("pi0"); | |
111 | static EvtId PIP=EvtPDL::getId("pi+"); | |
112 | static EvtId PIM=EvtPDL::getId("pi+"); | |
113 | static EvtId K0=EvtPDL::getId("K0"); | |
114 | static EvtId KB=EvtPDL::getId("anti-K0"); | |
115 | static EvtId KP=EvtPDL::getId("K+"); | |
116 | static EvtId KM=EvtPDL::getId("K-"); | |
117 | ||
118 | ||
119 | EvtComplex A; | |
120 | EvtComplex U, Ubar, V, Vbar, W, Wbar; | |
121 | ||
122 | U = EvtComplex(getArg(2)*cos(getArg(3)),getArg(2)*sin(getArg(3))); | |
123 | Ubar = EvtComplex(getArg(4)*cos(getArg(5)),getArg(4)*sin(getArg(5))); | |
124 | V = EvtComplex(getArg(6)*cos(getArg(7)),getArg(6)*sin(getArg(7))); | |
125 | Vbar = EvtComplex(getArg(8)*cos(getArg(9)),getArg(8)*sin(getArg(9))); | |
126 | W = EvtComplex(getArg(10)*cos(getArg(11)),getArg(10)*sin(getArg(11))); | |
127 | Wbar = EvtComplex(getArg(12)*cos(getArg(13)),getArg(12)*sin(getArg(13))); | |
128 | ||
129 | //depending on what combination of K pi we have, there will be different | |
130 | //A and Abar (only A given in comments!) | |
131 | ||
132 | if (((getDaug(0)==PI0) && (getDaug(1)==KP)) || ((getDaug(0)==KP) && (getDaug(1)==PI0))) { | |
133 | ||
134 | //pi0 K+, so U - W | |
135 | ||
136 | A = U - W; | |
137 | } | |
138 | ||
139 | if (((getDaug(0)==PI0) && (getDaug(1)==KM)) || ((getDaug(0)==KM) && (getDaug(1)==PI0))) { | |
140 | ||
141 | //pi0 K-, so Ubar - Wbar | |
142 | ||
143 | A = Ubar - Wbar; | |
144 | } | |
145 | ||
146 | if (((getDaug(0)==PIP) && (getDaug(1)==K0)) || ((getDaug(0)==K0) && (getDaug(1)==PIP))) { | |
147 | ||
148 | //pi+ K0, so V + W | |
149 | ||
150 | A = sqrt(2.0)*(V + W); | |
151 | } | |
152 | ||
153 | if (((getDaug(0)==PIM) && (getDaug(1)==KB)) || ((getDaug(0)==KB) && (getDaug(1)==PIM))) { | |
154 | ||
155 | //pi- K0bar, so Vbar + Wbar | |
156 | A = sqrt(2.0)*(Vbar + Wbar); | |
157 | } | |
158 | ||
159 | if (((getDaug(0)==PI0) && (getDaug(1)==K0)) || ((getDaug(0)==K0) && (getDaug(1)==PI0))) { | |
160 | ||
161 | //pi0 K0, so U + W | |
162 | ||
163 | A= U + W; | |
164 | } | |
165 | ||
166 | if (((getDaug(0)==PI0) && (getDaug(1)==KB)) || ((getDaug(0)==KB) && (getDaug(1)==PI0))) { | |
167 | ||
168 | A = Ubar + Wbar; | |
169 | } | |
170 | ||
171 | if (((getDaug(0)==PIM) && (getDaug(1)==KP)) || ((getDaug(0)==KP) && (getDaug(1)==PIM))) { | |
172 | ||
173 | //pi- K+, so V - W | |
174 | ||
175 | A = sqrt(2.0)*(V - W); | |
176 | } | |
177 | ||
178 | if (((getDaug(0)==PIP) && (getDaug(1)==KM)) || ((getDaug(0)==KM) && (getDaug(1)==PIP))) { | |
179 | ||
180 | A = sqrt(2.0)*(Vbar - Wbar); | |
181 | } | |
182 | ||
183 | vertex(A); | |
184 | ||
185 | return ; | |
186 | } | |
187 |