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EvtSSSCP.cpp
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EvtSSSCP.cpp
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//--------------------------------------------------------------------------
//
// Environment:
// This software is part of the EvtGen package developed jointly
// for the BaBar and CLEO collaborations. If you use all or part
// of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
// Copyright (C) 1998 Caltech, UCSB
//
// Module: EvtSSSCP.cc
//
// Description: Routine to decay scalar -> 2 scalars
//
// Modification history:
//
// RYD November 24, 1996 Module created
//
//------------------------------------------------------------------------
//
#include "EvtGenBase/EvtPatches.hh"
#include <stdlib.h>
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtCPUtil.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenModels/EvtSSSCP.hh"
#include <string>
#include "EvtGenBase/EvtConst.hh"
EvtSSSCP::~EvtSSSCP() {}
std::string EvtSSSCP::getName(){
return "SSS_CP";
}
EvtDecayBase* EvtSSSCP::clone(){
return new EvtSSSCP;
}
void EvtSSSCP::init(){
// check that there are 7 arguments
checkNArg(7);
checkNDaug(2);
checkSpinParent(EvtSpinType::SCALAR);
checkSpinDaughter(0,EvtSpinType::SCALAR);
checkSpinDaughter(1,EvtSpinType::SCALAR);
}
void EvtSSSCP::initProbMax(){
//This is probably not quite right, but it should do as a start...
//Anders
setProbMax(2*(getArg(3)*getArg(3)+getArg(5)*getArg(5)));
}
void EvtSSSCP::decay( EvtParticle *p ){
//added by Lange Jan4,2000
static EvtId B0=EvtPDL::getId("B0");
static EvtId B0B=EvtPDL::getId("anti-B0");
double t;
EvtId other_b;
EvtCPUtil::getInstance()->OtherB(p,t,other_b,0.5);
p->initializePhaseSpace(getNDaug(),getDaugs());
EvtComplex amp;
EvtComplex A,Abar;
A=EvtComplex(getArg(3)*cos(getArg(4)),getArg(3)*sin(getArg(4)));
Abar=EvtComplex(getArg(5)*cos(getArg(6)),getArg(5)*sin(getArg(6)));
if (other_b==B0B){
amp=A*cos(getArg(1)*t/(2*EvtConst::c))+
EvtComplex(cos(-2.0*getArg(0)),sin(-2.0*getArg(0)))*
getArg(2)*EvtComplex(0.0,1.0)*Abar*sin(getArg(1)*t/(2*EvtConst::c));
}
if (other_b==B0){
amp=A*EvtComplex(cos(2.0*getArg(0)),sin(2.0*getArg(0)))*
EvtComplex(0.0,1.0)*sin(getArg(1)*t/(2*EvtConst::c))+
getArg(2)*Abar*cos(getArg(1)*t/(2*EvtConst::c));
}
vertex(amp);
return ;
}

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