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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) 1999 Caltech, UCSB | |
10 | // | |
11 | // Module: EvtSVVCPLH.cc | |
12 | // | |
13 | // Description: The decay of a scalar to two vector particles are | |
14 | // performed with CP violation and different widths for | |
15 | // the cpe even and od states. E.g. Bs->J/psi phi. | |
16 | // | |
17 | // Modification history: | |
18 | // | |
19 | // RYD November 5, 1999 Module created | |
20 | // | |
21 | //------------------------------------------------------------------------ | |
22 | // | |
23 | #include "EvtGenBase/EvtPatches.hh" | |
24 | #include <stdlib.h> | |
25 | #include "EvtGenBase/EvtParticle.hh" | |
26 | #include "EvtGenBase/EvtGenKine.hh" | |
27 | #include "EvtGenBase/EvtCPUtil.hh" | |
28 | #include "EvtGenBase/EvtPDL.hh" | |
29 | #include "EvtGenModels/EvtSVVHelAmp.hh" | |
30 | #include "EvtGenBase/EvtReport.hh" | |
31 | #include "EvtGenModels/EvtSVVCPLH.hh" | |
32 | #include "EvtGenBase/EvtId.hh" | |
33 | #include <string> | |
34 | #include "EvtGenBase/EvtConst.hh" | |
35 | using std::endl; | |
36 | ||
37 | EvtSVVCPLH::~EvtSVVCPLH() {} | |
38 | ||
39 | std::string EvtSVVCPLH::getName(){ | |
40 | ||
41 | return "SVV_CPLH"; | |
42 | ||
43 | } | |
44 | ||
45 | ||
46 | EvtDecayBase* EvtSVVCPLH::clone(){ | |
47 | ||
48 | return new EvtSVVCPLH; | |
49 | ||
50 | } | |
51 | ||
52 | void EvtSVVCPLH::init(){ | |
53 | ||
54 | // check that there are 9 arguments | |
55 | checkNArg(9); | |
56 | checkNDaug(2); | |
57 | ||
58 | checkSpinParent(EvtSpinType::SCALAR); | |
59 | ||
60 | checkSpinDaughter(0,EvtSpinType::VECTOR); | |
61 | checkSpinDaughter(1,EvtSpinType::VECTOR); | |
62 | ||
63 | } | |
64 | ||
65 | void EvtSVVCPLH::initProbMax(){ | |
66 | ||
67 | //This is probably not quite right, but it should do as a start... | |
68 | //Anders | |
69 | ||
70 | setProbMax(2*(getArg(3)*getArg(3)+getArg(5)*getArg(5)+getArg(7)*getArg(7))); | |
71 | ||
72 | } | |
73 | ||
74 | void EvtSVVCPLH::decay( EvtParticle *p){ | |
75 | ||
76 | //added by Lange Jan4,2000 | |
77 | static EvtId BS0=EvtPDL::getId("B_s0"); | |
78 | static EvtId BSB=EvtPDL::getId("anti-B_s0"); | |
79 | ||
80 | double t; | |
81 | EvtId other_b; | |
82 | ||
0ca57c2f | 83 | EvtCPUtil::getInstance()->OtherB(p,t,other_b); |
da0e9ce3 | 84 | |
85 | EvtComplex G0P,G1P,G1M; | |
86 | ||
87 | G1P=EvtComplex(getArg(3)*cos(getArg(4)),getArg(3)*sin(getArg(4))); | |
88 | G0P=EvtComplex(getArg(5)*cos(getArg(6)),getArg(5)*sin(getArg(6))); | |
89 | G1M=EvtComplex(getArg(7)*cos(getArg(8)),getArg(7)*sin(getArg(8))); | |
90 | ||
91 | EvtComplex lambda_km=EvtComplex(cos(2*getArg(0)),sin(2*getArg(0))); | |
92 | ||
93 | double cdmt=cos(getArg(1)*t/(2*EvtConst::c)); | |
94 | double sdmt=sin(getArg(1)*t/(2*EvtConst::c)); | |
95 | ||
96 | EvtComplex cG0P,cG1P,cG1M; | |
97 | ||
98 | static double ctauL=EvtPDL::getctau(EvtPDL::getId("B_s0L")); | |
99 | static double ctauH=EvtPDL::getctau(EvtPDL::getId("B_s0H")); | |
100 | ||
101 | //I'm not sure if the fabs() is right when t can be | |
102 | //negative as in the case of Bs produced coherently. | |
103 | double pt=1; | |
104 | double mt=exp(-fabs(t*(ctauL-ctauH)/(ctauL*ctauH))); | |
105 | ||
106 | if (other_b==BSB){ | |
107 | cG0P=pt*G0P*(cdmt+lambda_km*EvtComplex(0.0,getArg(2)*sdmt)); | |
108 | cG1P=pt*G1P*(cdmt+lambda_km*EvtComplex(0.0,getArg(2)*sdmt)); | |
109 | cG1M=mt*G1M*(cdmt-lambda_km*EvtComplex(0.0,getArg(2)*sdmt)); | |
110 | } | |
111 | else if (other_b==BS0){ | |
112 | cG0P=pt*G0P*(cdmt+(1.0/lambda_km)*EvtComplex(0.0,getArg(2)*sdmt)); | |
113 | cG1P=pt*G1P*(cdmt+(1.0/lambda_km)*EvtComplex(0.0,getArg(2)*sdmt)); | |
114 | cG1M=-mt*G1M*(cdmt-(1.0/lambda_km)*EvtComplex(0.0,getArg(2)*sdmt)); | |
115 | } | |
116 | else{ | |
117 | report(ERROR,"EvtGen") << "other_b was not BSB or BS0!"<<endl; | |
118 | ::abort(); | |
119 | } | |
120 | ||
121 | EvtComplex A0,AP,AM; | |
122 | ||
123 | A0=cG0P/sqrt(2.0); | |
124 | AP=(cG1P+cG1M)/sqrt(2.0); | |
125 | AM=(cG1P-cG1M)/sqrt(2.0); | |
126 | ||
127 | EvtSVVHelAmp::SVVHel(p,_amp2,getDaug(0),getDaug(1),AP,A0,AM); | |
128 | ||
129 | return ; | |
130 | } | |
131 | ||
132 | ||
133 |