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EvtSVSNONCPEIGEN.cpp
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EvtSVSNONCPEIGEN.cpp
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/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* EvtGen is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
***********************************************************************/
#include "EvtGenModels/EvtSVSNONCPEIGEN.hh"
#include "EvtGenBase/EvtCPUtil.hh"
#include "EvtGenBase/EvtConst.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtRandom.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenBase/EvtVector4C.hh"
#include <stdlib.h>
#include <string>
std::string EvtSVSNONCPEIGEN::getName()
{
return "SVS_NONCPEIGEN";
}
EvtDecayBase* EvtSVSNONCPEIGEN::clone()
{
return new EvtSVSNONCPEIGEN;
}
void EvtSVSNONCPEIGEN::init()
{
// check that there are 11 arguments
checkNArg( 11, 7 );
checkNDaug( 2 );
checkSpinDaughter( 0, EvtSpinType::VECTOR );
checkSpinDaughter( 1, EvtSpinType::SCALAR );
_dm = getArg( 1 );
_phickm = 2 * getArg( 0 ) + getArg( 2 );
_A_f = EvtComplex( getArg( 3 ) * cos( getArg( 4 ) ),
getArg( 3 ) * sin( getArg( 4 ) ) );
_Abar_f = EvtComplex( getArg( 5 ) * cos( getArg( 6 ) ),
getArg( 5 ) * sin( getArg( 6 ) ) );
_A_fbar = _Abar_f;
_Abar_fbar = _A_f;
if ( getNArg() == 11 ) {
_A_fbar = EvtComplex( getArg( 7 ) * cos( getArg( 8 ) ),
getArg( 7 ) * sin( getArg( 8 ) ) );
_Abar_fbar = EvtComplex( getArg( 9 ) * cos( getArg( 10 ) ),
getArg( 9 ) * sin( getArg( 10 ) ) );
}
}
void EvtSVSNONCPEIGEN::initProbMax()
{
double theProbMax = abs( _A_f ) * abs( _A_f ) +
abs( _Abar_f ) * abs( _Abar_f ) +
abs( _A_fbar ) * abs( _A_fbar ) +
abs( _Abar_fbar ) * abs( _Abar_fbar );
setProbMax( theProbMax );
}
void EvtSVSNONCPEIGEN::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;
EvtId daugs[2];
// MB: flip selects the final of the decay
int flip = ( ( p->getId() == B0 ) ? 0 : 1 );
daugs[0] = getDaug( 0 );
daugs[1] = getDaug( 1 );
p->initializePhaseSpace( 2, daugs );
EvtCPUtil::getInstance()->OtherB( p, t, other_b, 0.5 );
EvtComplex amp;
double dmt2 = ( _dm * t ) / ( 2 * EvtConst::c );
EvtComplex ePlusIPhi( cos( _phickm ), sin( _phickm ) );
EvtComplex eMinusIPhi( cos( -_phickm ), -sin( _phickm ) );
// flip == 0 : D-rho+
// flip == 1 : D+rho-
if ( !flip ) {
if ( other_b == B0B ) {
// At t=0 we have a B0
amp = cos( dmt2 ) * _A_f +
eMinusIPhi * EvtComplex( 0.0, sin( dmt2 ) ) * _Abar_f;
}
if ( other_b == B0 ) {
// At t=0 we have a B0bar
amp = ePlusIPhi * EvtComplex( 0.0, sin( dmt2 ) ) * _A_f +
cos( dmt2 ) * _Abar_f;
}
} else {
if ( other_b == B0B ) {
// At t=0 we have a B0
amp = cos( dmt2 ) * _A_fbar +
eMinusIPhi * EvtComplex( 0.0, sin( dmt2 ) ) * _Abar_fbar;
}
if ( other_b == B0 ) {
// At t=0 we have a B0bar
amp = ePlusIPhi * EvtComplex( 0.0, sin( dmt2 ) ) * _A_fbar +
cos( dmt2 ) * _Abar_fbar;
}
}
EvtParticle* v;
v = p->getDaug( 0 );
EvtVector4R momv = p->getDaug( 0 )->getP4();
EvtVector4R moms = p->getDaug( 1 )->getP4();
EvtVector4R p4_parent = momv + moms;
double norm = momv.mass() / ( momv.d3mag() * p->mass() );
vertex( 0, amp * norm * p4_parent * ( v->epsParent( 0 ) ) );
vertex( 1, amp * norm * p4_parent * ( v->epsParent( 1 ) ) );
vertex( 2, amp * norm * p4_parent * ( v->epsParent( 2 ) ) );
return;
}

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