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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: EvtSSSCPT.cc | |
12 | // | |
13 | // Description: Routine to decay scalar -> 2 scalars (CPT) | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // SHY April 28, 1997 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/EvtSSSCPT.hh" | |
29 | #include "EvtGenBase/EvtId.hh" | |
30 | #include <string> | |
31 | #include "EvtGenBase/EvtConst.hh" | |
32 | ||
33 | EvtSSSCPT::~EvtSSSCPT() {} | |
34 | ||
35 | std::string EvtSSSCPT::getName(){ | |
36 | ||
37 | return "SSS_CPT"; | |
38 | ||
39 | } | |
40 | ||
41 | ||
42 | EvtDecayBase* EvtSSSCPT::clone(){ | |
43 | ||
44 | return new EvtSSSCPT; | |
45 | ||
46 | } | |
47 | ||
48 | void EvtSSSCPT::init(){ | |
49 | ||
50 | // check that there are 8 arguments | |
51 | checkNArg(8); | |
52 | checkNDaug(2); | |
53 | ||
54 | } | |
55 | ||
56 | ||
57 | void EvtSSSCPT::decay( EvtParticle *p){ | |
58 | ||
59 | //added by Lange Jan4,2000 | |
60 | static EvtId B0=EvtPDL::getId("B0"); | |
61 | static EvtId B0B=EvtPDL::getId("anti-B0"); | |
62 | ||
63 | ||
64 | double t; | |
65 | EvtId other_b; | |
66 | ||
67 | EvtCPUtil::OtherB(p,t,other_b); | |
68 | ||
69 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
70 | ||
71 | EvtComplex amp; | |
72 | ||
73 | EvtComplex A,Abar; | |
74 | EvtComplex P,Q,D,Im; | |
75 | ||
76 | P=EvtComplex(cos(-getArg(0)),sin(-getArg(0))); | |
77 | Q=EvtComplex(cos(getArg(0)),sin(getArg(0))); | |
78 | D=EvtComplex(getArg(6)*cos(getArg(7)),getArg(6)*sin(getArg(7))); | |
79 | Im=EvtComplex(0.0,1.0); | |
80 | ||
81 | A=EvtComplex(getArg(2)*cos(getArg(3)),getArg(2)*sin(getArg(3))); | |
82 | Abar=EvtComplex(getArg(4)*cos(getArg(5)),getArg(4)*sin(getArg(5))); | |
83 | ||
84 | if (other_b==B0B){ | |
85 | amp=A*cos(getArg(1)*t/(2*EvtConst::c))+ | |
86 | Im*sin(getArg(1)*t/(2*EvtConst::c))* | |
87 | (Q/P*A + 2.0*D*Abar); | |
88 | } | |
89 | if (other_b==B0){ | |
90 | amp=Abar*cos(getArg(1)*t/(2*EvtConst::c))+ | |
91 | Im*sin(getArg(1)*t/(2*EvtConst::c))* | |
92 | (P/Q*A - 2.0*D*Abar); | |
93 | } | |
94 | ||
95 | vertex(amp); | |
96 | ||
97 | return ; | |
98 | } | |
99 |