Converting TEvtGen to native cmake
[u/mrichter/AliRoot.git] / TEvtGen / EvtGen / EvtGenModels / EvtSVSNONCPEIGEN.cpp
CommitLineData
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: EvtSVSNONCPEIGEN.cc
12//
13// Description: Routine to decay scalar -> vectors scalar
14// and has CP violation.
15//
16// Modification history:
17//
18// RYD April 26, 1997 Module created
19//
20//------------------------------------------------------------------------
21//
22#include "EvtGenBase/EvtPatches.hh"
23#include <stdlib.h>
24#include "EvtGenBase/EvtParticle.hh"
25#include "EvtGenBase/EvtRandom.hh"
26#include "EvtGenBase/EvtGenKine.hh"
27#include "EvtGenBase/EvtCPUtil.hh"
28#include "EvtGenBase/EvtPDL.hh"
29#include "EvtGenBase/EvtReport.hh"
30#include "EvtGenBase/EvtVector4C.hh"
31#include "EvtGenModels/EvtSVSNONCPEIGEN.hh"
32#include <string>
33#include "EvtGenBase/EvtConst.hh"
34
35EvtSVSNONCPEIGEN::~EvtSVSNONCPEIGEN() {}
36
37std::string EvtSVSNONCPEIGEN::getName(){
38
39 return "SVS_NONCPEIGEN";
40
41}
42
43
44EvtDecayBase* EvtSVSNONCPEIGEN::clone(){
45
46 return new EvtSVSNONCPEIGEN;
47
48}
49
50void EvtSVSNONCPEIGEN::init(){
51
52 // check that there are 11 arguments
53 checkNArg(11,7);
54 checkNDaug(2);
55
56 checkSpinDaughter(0,EvtSpinType::VECTOR);
57 checkSpinDaughter(1,EvtSpinType::SCALAR);
58
59 _dm=getArg(1);
60 _phickm=2*getArg(0)+getArg(2);
61
62 _A_f=EvtComplex(getArg(3)*cos(getArg(4)),getArg(3)*sin(getArg(4)));
63 _Abar_f=EvtComplex(getArg(5)*cos(getArg(6)),getArg(5)*sin(getArg(6)));
64
65 _A_fbar=_Abar_f;
66 _Abar_fbar=_A_f;
67
68 if (getNArg()==11){
69 _A_fbar=EvtComplex(getArg(7)*cos(getArg(8)),getArg(7)*sin(getArg(8)));
70 _Abar_fbar=EvtComplex(getArg(9)*cos(getArg(10)),getArg(9)*sin(getArg(10)));
71 }
72}
73
74void EvtSVSNONCPEIGEN::initProbMax() {
75 double theProbMax =
76 abs(_A_f) * abs(_A_f) +
77 abs(_Abar_f) * abs(_Abar_f) +
78 abs(_A_fbar) * abs(_A_fbar) +
79 abs(_Abar_fbar) * abs(_Abar_fbar);
80
81 setProbMax(theProbMax);
82}
83
84void EvtSVSNONCPEIGEN::decay( EvtParticle *p){
85
86 //added by Lange Jan4,2000
87 static EvtId B0=EvtPDL::getId("B0");
88 static EvtId B0B=EvtPDL::getId("anti-B0");
89
90 double t;
91 EvtId other_b;
92 EvtId daugs[2];
93
94 // MB: flip selects the final of the decay
95 int flip = ((p->getId() == B0) ? 0 : 1);
96 daugs[0]=getDaug(0);
97 daugs[1]=getDaug(1);
98 p->initializePhaseSpace(2, daugs);
99
0ca57c2f 100 EvtCPUtil::getInstance()->OtherB(p,t,other_b,0.5);
da0e9ce3 101
102 EvtComplex amp;
103 double dmt2 = (_dm * t) / (2 * EvtConst::c);
104 EvtComplex ePlusIPhi(cos(_phickm), sin(_phickm));
105 EvtComplex eMinusIPhi(cos(-_phickm), -sin(_phickm));
106
107 // flip == 0 : D-rho+
108 // flip == 1 : D+rho-
109
110 if (!flip) {
111 if (other_b==B0B){
112 // At t=0 we have a B0
113 amp = cos(dmt2)*_A_f + eMinusIPhi*EvtComplex(0.0,sin(dmt2))*_Abar_f;
114 }
115 if (other_b==B0){
116 // At t=0 we have a B0bar
117 amp = ePlusIPhi*EvtComplex(0.0,sin(dmt2))*_A_f + cos(dmt2)*_Abar_f;
118 }
119 }
120 else{
121 if (other_b==B0B){
122 // At t=0 we have a B0
123 amp = cos(dmt2)*_A_fbar + eMinusIPhi*EvtComplex(0.0,sin(dmt2))*_Abar_fbar;
124 }
125 if (other_b==B0){
126 // At t=0 we have a B0bar
127 amp = ePlusIPhi*EvtComplex(0.0,sin(dmt2))*_A_fbar + cos(dmt2)*_Abar_fbar;
128 }
129 }
130
131
132 EvtParticle *v;
133 v= p->getDaug(0);
134
135 EvtVector4R momv = p->getDaug(0)->getP4();
136 EvtVector4R moms = p->getDaug(1)->getP4();
137 EvtVector4R p4_parent=momv+moms;
138
139 double norm=momv.mass()/(momv.d3mag()*p->mass());
140
141 vertex(0,amp*norm*p4_parent*(v->epsParent(0)));
142 vertex(1,amp*norm*p4_parent*(v->epsParent(1)));
143 vertex(2,amp*norm*p4_parent*(v->epsParent(2)));
144
145 return ;
146}
147