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: EvtSVSCP.cc
13 // Description: Routine to decay scalar -> vectors scalar
14 // and has CP violation.
16 // Modification history:
18 // RYD Febuary 10, 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/EvtVector4C.hh"
28 #include "EvtGenBase/EvtPDL.hh"
29 #include "EvtGenBase/EvtReport.hh"
30 #include "EvtGenModels/EvtSVSCP.hh"
32 #include "EvtGenBase/EvtConst.hh"
34 EvtSVSCP::~EvtSVSCP() {}
36 std::string EvtSVSCP::getName(){
43 EvtDecayBase* EvtSVSCP::clone(){
49 void EvtSVSCP::init(){
51 // check that there are 7 arguments
55 checkSpinParent(EvtSpinType::SCALAR);
57 checkSpinDaughter(0,EvtSpinType::VECTOR);
58 checkSpinDaughter(1,EvtSpinType::SCALAR);
64 void EvtSVSCP::initProbMax(){
66 //This is probably not quite right, but it should do as a start...
69 setProbMax(2*(getArg(3)*getArg(3)+getArg(5)*getArg(5)));
74 void EvtSVSCP::decay( EvtParticle *p ){
76 //added by Lange Jan4,2000
77 static EvtId B0=EvtPDL::getId("B0");
78 static EvtId B0B=EvtPDL::getId("anti-B0");
81 p->initializePhaseSpace(getNDaug(),getDaugs());
83 EvtVector4R momv = v->getP4();
84 EvtVector4R moms = p->getDaug(1)->getP4();
85 double massv = v->mass();
89 EvtCPUtil::OtherB(p,t,other_b);
95 A=EvtComplex(getArg(3)*cos(getArg(4)),getArg(3)*sin(getArg(4)));
96 Abar=EvtComplex(getArg(5)*cos(getArg(6)),getArg(5)*sin(getArg(6)));
99 amp=A*cos(getArg(1)*t/(2*EvtConst::c))+
100 EvtComplex(cos(-2.0*getArg(0)),sin(-2.0*getArg(0)))*
101 getArg(2)*EvtComplex(0.0,1.0)*Abar*sin(getArg(1)*t/(2*EvtConst::c));
104 amp=A*EvtComplex(cos(2.0*getArg(0)),sin(2.0*getArg(0)))*
105 EvtComplex(0.0,1.0)*sin(getArg(1)*t/(2*EvtConst::c))+
106 getArg(2)*Abar*cos(getArg(1)*t/(2*EvtConst::c));
109 EvtVector4R p4_parent;
113 double norm=massv/(momv.d3mag()*p4_parent.mass());
115 vertex(0,amp*norm*p4_parent*(v->epsParent(0)));
116 vertex(1,amp*norm*p4_parent*(v->epsParent(1)));
117 vertex(2,amp*norm*p4_parent*(v->epsParent(2)));