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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: EvtGen/EvtGenericDalitz.hh | |
12 | // | |
13 | // Description: Model to describe a generic dalitz decay | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // DCC 16 December, 2011 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | ||
21 | #include "EvtGenModels/EvtGenericDalitz.hh" | |
22 | #include "EvtGenModels/EvtDalitzTable.hh" | |
23 | #include "EvtGenBase/EvtParticle.hh" | |
24 | #include "EvtGenBase/EvtDalitzPoint.hh" | |
25 | #include "EvtGenBase/EvtPDL.hh" | |
26 | ||
27 | std::string EvtGenericDalitz::getName() { | |
28 | return "GENERIC_DALITZ"; | |
29 | } | |
30 | ||
31 | EvtDecayBase* EvtGenericDalitz::clone() { | |
32 | return new EvtGenericDalitz(); | |
33 | } | |
34 | ||
35 | void EvtGenericDalitz::init() { | |
36 | ||
37 | checkNArg(1); | |
38 | ||
39 | EvtId parnum=getParentId(); | |
40 | EvtId d1=getDaug(0); | |
41 | EvtId d2=getDaug(1); | |
42 | EvtId d3=getDaug(2); | |
43 | ||
44 | std::vector<EvtDalitzDecayInfo> decays = EvtDalitzTable::getInstance(getArgStr(0))->getDalitzTable(parnum); | |
45 | ||
46 | std::vector<EvtDalitzDecayInfo>::iterator i = decays.begin(); | |
47 | for( ; i != decays.end(); i++) { | |
48 | EvtId daughter1 = (*i).daughter1(); | |
49 | EvtId daughter2 = (*i).daughter2(); | |
50 | EvtId daughter3 = (*i).daughter3(); | |
51 | ||
52 | if(d1 == daughter1 && d2 == daughter2 && d3 == daughter3) { | |
53 | _d1 = 0; | |
54 | _d2 = 1; | |
55 | _d3 = 2; | |
56 | } else if(d1 == daughter1 && d2 == daughter3 && d3 == daughter2) { | |
57 | _d1 = 0; | |
58 | _d2 = 2; | |
59 | _d3 = 1; | |
60 | } else if(d1 == daughter2 && d2 == daughter1 && d3 == daughter3) { | |
61 | _d1 = 1; | |
62 | _d2 = 0; | |
63 | _d3 = 2; | |
64 | } else if(d1 == daughter2 && d2 == daughter3 && d3 == daughter1) { | |
65 | _d1 = 1; | |
66 | _d2 = 2; | |
67 | _d3 = 0; | |
68 | } else if(d1 == daughter3 && d2 == daughter1 && d3 == daughter2) { | |
69 | _d1 = 2; | |
70 | _d2 = 0; | |
71 | _d3 = 1; | |
72 | } else if(d1 == daughter3 && d2 == daughter2 && d3 == daughter1) { | |
73 | _d1 = 2; | |
74 | _d2 = 1; | |
75 | _d3 = 0; | |
76 | } else { | |
77 | continue; | |
78 | } | |
79 | ||
80 | _resonances = (*i).getResonances(); | |
81 | setProbMax((*i).getProbMax()); | |
82 | return; | |
83 | } | |
84 | } | |
85 | ||
86 | void EvtGenericDalitz::decay(EvtParticle *p) { | |
87 | ||
88 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
89 | ||
90 | EvtVector4R p4_d1 = p->getDaug(_d1)->getP4(); | |
91 | EvtVector4R p4_d2 = p->getDaug(_d2)->getP4(); | |
92 | EvtVector4R p4_d3 = p->getDaug(_d3)->getP4(); | |
93 | ||
94 | double mA = p->getDaug(_d1)->mass(); | |
95 | double mB = p->getDaug(_d2)->mass(); | |
96 | double mC = p->getDaug(_d3)->mass(); | |
97 | ||
98 | double m2AB = ( p4_d1 + p4_d2 ).mass2(); | |
99 | double m2CA = ( p4_d1 + p4_d3 ).mass2(); | |
100 | double m2BC = ( p4_d2 + p4_d3 ).mass2(); | |
101 | ||
102 | EvtDalitzPoint point( mA, mB, mC, m2AB, m2BC, m2CA ); | |
103 | ||
104 | EvtComplex amp(0,0); | |
105 | std::vector<std::pair<EvtComplex,EvtDalitzReso> >::iterator i = _resonances.begin(); | |
106 | for( ; i!= _resonances.end(); i++) { | |
107 | std::pair<EvtComplex,EvtDalitzReso> res = (*i); | |
108 | amp += res.first * res.second.evaluate( point ); | |
109 | } | |
110 | ||
111 | vertex(amp); | |
112 | return; | |
113 | } | |
114 | ||
115 | std::string EvtGenericDalitz::getParamName(int i) { | |
116 | switch(i) { | |
117 | case 0: | |
118 | return "xmlFile"; | |
119 | default: | |
120 | return ""; | |
121 | } | |
122 | } |