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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: EvtSSSCP.cc | |
12 | // | |
13 | // Description: Routine to decay scalar -> 2 scalars | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // RYD November 24, 1996 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/EvtCPUtil.hh" | |
26 | #include "EvtGenBase/EvtPDL.hh" | |
27 | #include "EvtGenBase/EvtReport.hh" | |
28 | #include "EvtGenModels/EvtSSSCP.hh" | |
29 | #include <string> | |
30 | #include "EvtGenBase/EvtConst.hh" | |
31 | ||
32 | EvtSSSCP::~EvtSSSCP() {} | |
33 | ||
34 | std::string EvtSSSCP::getName(){ | |
35 | ||
36 | return "SSS_CP"; | |
37 | ||
38 | } | |
39 | ||
40 | ||
41 | EvtDecayBase* EvtSSSCP::clone(){ | |
42 | ||
43 | return new EvtSSSCP; | |
44 | ||
45 | } | |
46 | ||
47 | void EvtSSSCP::init(){ | |
48 | ||
49 | // check that there are 7 arguments | |
50 | checkNArg(7); | |
51 | checkNDaug(2); | |
52 | checkSpinParent(EvtSpinType::SCALAR); | |
53 | ||
54 | checkSpinDaughter(0,EvtSpinType::SCALAR); | |
55 | checkSpinDaughter(1,EvtSpinType::SCALAR); | |
56 | ||
57 | } | |
58 | ||
59 | void EvtSSSCP::initProbMax(){ | |
60 | ||
61 | //This is probably not quite right, but it should do as a start... | |
62 | //Anders | |
63 | ||
64 | setProbMax(2*(getArg(3)*getArg(3)+getArg(5)*getArg(5))); | |
65 | ||
66 | } | |
67 | ||
68 | void EvtSSSCP::decay( EvtParticle *p ){ | |
69 | ||
70 | //added by Lange Jan4,2000 | |
71 | static EvtId B0=EvtPDL::getId("B0"); | |
72 | static EvtId B0B=EvtPDL::getId("anti-B0"); | |
73 | ||
74 | double t; | |
75 | EvtId other_b; | |
76 | ||
77 | EvtCPUtil::OtherB(p,t,other_b); | |
78 | ||
79 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
80 | ||
81 | ||
82 | EvtComplex amp; | |
83 | ||
84 | EvtComplex A,Abar; | |
85 | ||
86 | A=EvtComplex(getArg(3)*cos(getArg(4)),getArg(3)*sin(getArg(4))); | |
87 | Abar=EvtComplex(getArg(5)*cos(getArg(6)),getArg(5)*sin(getArg(6))); | |
88 | ||
89 | if (other_b==B0B){ | |
90 | amp=A*cos(getArg(1)*t/(2*EvtConst::c))+ | |
91 | EvtComplex(cos(-2.0*getArg(0)),sin(-2.0*getArg(0)))* | |
92 | getArg(2)*EvtComplex(0.0,1.0)*Abar*sin(getArg(1)*t/(2*EvtConst::c)); | |
93 | } | |
94 | if (other_b==B0){ | |
95 | amp=A*EvtComplex(cos(2.0*getArg(0)),sin(2.0*getArg(0)))* | |
96 | EvtComplex(0.0,1.0)*sin(getArg(1)*t/(2*EvtConst::c))+ | |
97 | getArg(2)*Abar*cos(getArg(1)*t/(2*EvtConst::c)); | |
98 | } | |
99 | ||
100 | vertex(amp); | |
101 | ||
102 | return ; | |
103 | } | |
104 |