1 //--------------------------------------------------------------------------
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.
8 // Copyright Information: See EvtGen/COPYRIGHT
9 // Copyright (C) 1998 Caltech, UCSB
11 // Module: EvtSTSCP.cc
13 // Description: Routine to decay scalar -> tensor scalar
14 // and has CP violation.
16 // Modification history:
18 // RYD June 19, 1997 Module created
20 //------------------------------------------------------------------------
22 #include "EvtGenBase/EvtPatches.hh"
24 #include "EvtGenBase/EvtParticle.hh"
25 #include "EvtGenBase/EvtGenKine.hh"
26 #include "EvtGenBase/EvtCPUtil.hh"
27 #include "EvtGenBase/EvtTensor4C.hh"
28 #include "EvtGenBase/EvtVector4C.hh"
29 #include "EvtGenBase/EvtPDL.hh"
30 #include "EvtGenBase/EvtReport.hh"
31 #include "EvtGenModels/EvtSTSCP.hh"
32 #include "EvtGenBase/EvtId.hh"
34 #include "EvtGenBase/EvtConst.hh"
36 EvtSTSCP::~EvtSTSCP() {}
38 std::string EvtSTSCP::getName(){
44 void EvtSTSCP::initProbMax(){
46 //This is probably not quite right, but it should do as a start...
49 setProbMax(20*(getArg(3)*getArg(3)+getArg(5)*getArg(5)));
53 EvtDecayBase* EvtSTSCP::clone(){
59 void EvtSTSCP::init(){
61 // check that there are 7 arguments
65 checkSpinParent(EvtSpinType::SCALAR);
67 checkSpinDaughter(0,EvtSpinType::TENSOR);
68 checkSpinDaughter(1,EvtSpinType::SCALAR);
73 void EvtSTSCP::decay( EvtParticle *p){
75 //added by Lange Jan4,2000
76 static EvtId B0=EvtPDL::getId("B0");
77 static EvtId B0B=EvtPDL::getId("anti-B0");
83 p->initializePhaseSpace(getNDaug(),getDaugs());
85 EvtVector4R momt = t1->getP4();
86 EvtVector4R moms = p->getDaug(1)->getP4();
87 double masst = t1->mass();
89 EvtCPUtil::getInstance()->OtherB(p,t,other_b,0.5);
91 double m_parent = p->mass();
97 A=EvtComplex(getArg(3)*cos(getArg(4)),getArg(3)*sin(getArg(4)));
98 Abar=EvtComplex(getArg(5)*cos(getArg(6)),getArg(5)*sin(getArg(6)));
101 amp=A*cos(getArg(1)*t/(2*EvtConst::c))+
102 EvtComplex(cos(-2.0*getArg(0)),sin(-2.0*getArg(0)))*
103 getArg(2)*EvtComplex(0.0,1.0)*Abar*sin(getArg(1)*t/(2*EvtConst::c));
106 amp=A*EvtComplex(cos(2.0*getArg(0)),sin(2.0*getArg(0)))*
107 EvtComplex(0.0,1.0)*sin(getArg(1)*t/(2*EvtConst::c))+
108 getArg(2)*Abar*cos(getArg(1)*t/(2*EvtConst::c));
111 EvtVector4R p4_parent;
115 double norm=masst*masst/(m_parent*momt.d3mag()*momt.d3mag());
118 vertex(0,amp*norm*t1->epsTensorParent(0).cont1(p4_parent)*p4_parent);
119 vertex(1,amp*norm*t1->epsTensorParent(1).cont1(p4_parent)*p4_parent);
120 vertex(2,amp*norm*t1->epsTensorParent(2).cont1(p4_parent)*p4_parent);
121 vertex(3,amp*norm*t1->epsTensorParent(3).cont1(p4_parent)*p4_parent);
122 vertex(4,amp*norm*t1->epsTensorParent(4).cont1(p4_parent)*p4_parent);
127 std::string EvtSTSCP::getParamName(int i) {
134 return "finalStateCP";
148 std::string EvtSTSCP::getParamDefault(int i) {