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EvtBToVlnuBallFF.cpp
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EvtBToVlnuBallFF.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/EvtBToVlnuBallFF.hh"
#include "EvtGenBase/EvtId.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtReport.hh"
#include <math.h>
#include <stdlib.h>
#include <string>
EvtBToVlnuBallFF::EvtBToVlnuBallFF( double r2_A1, double mfit2_A1, double r1_A2,
double r2_A2, double mfit2_A2, double r1_V,
double r2_V, double mfit2_V )
{
_r2_A1 = r2_A1;
_mfit2_A1 = mfit2_A1;
_r1_A2 = r1_A2;
_r2_A2 = r2_A2;
_mfit2_A2 = mfit2_A2;
_r1_V = r1_V;
_r2_V = r2_V;
_mfit2_V = mfit2_V;
return;
}
void EvtBToVlnuBallFF::getvectorff( EvtId parent, EvtId /*daught*/, double t,
double /*mass*/, double* a1f, double* a2f,
double* vf, double* a0f )
{
// FF calculations taken from the LCSR calculation of
// P. Ball, R. Zwicky, Phys.~Rev.~{\bf D71} 014029 (2005), hep-ph/0412079.
//Define mBstar
EvtId Bplus = EvtPDL::getId( "B+" );
EvtId Bminus = EvtPDL::getId( "B-" );
double mBstar = EvtPDL::getMeanMass( EvtPDL::getId( "B*0" ) );
if ( parent == Bplus || parent == Bminus )
mBstar = EvtPDL::getMeanMass( EvtPDL::getId( "B*+" ) );
double q2 = t;
*a1f = _r2_A1 / ( 1. - q2 / _mfit2_A1 );
*a2f = _r1_A2 / ( 1. - q2 / _mfit2_A2 ) +
_r2_A2 / pow( 1. - q2 / _mfit2_A2, 2. );
*vf = _r1_V / ( 1. - q2 / mBstar / mBstar ) + _r2_V / ( 1. - q2 / _mfit2_V );
*a0f = 0.0;
return;
// OLD STUFF from HQETFF
// double mb=EvtPDL::getMeanMass(parent);
// double w = ((mb*mb)+(mass*mass)-t)/(2.0*mb*mass);
// Form factors have a general form, with parameters passed in
// from the arguements.
// double rstar = ( 2.0*sqrt(mb*mass))/(mb+mass);
// double ha1 = 1-rho2*(w-1);
// *a1f = (1.0 - (t/((mb+mass)*(mb+mass))))*ha1;
// *a1f = (*a1f)/rstar;
// *a2f = (r2/rstar)*ha1;
// *vf = (r1/rstar)*ha1;
}
void EvtBToVlnuBallFF::getscalarff( EvtId, EvtId, double, double, double*,
double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :getvectorff in EvtBToVlnuBallFF.\n";
::abort();
}
void EvtBToVlnuBallFF::gettensorff( EvtId, EvtId, double, double, double*,
double*, double*, double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :gettensorff in EvtBToVlnuBallFF.\n";
::abort();
}
void EvtBToVlnuBallFF::getbaryonff( EvtId, EvtId, double, double, double*,
double*, double*, double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :getbaryonff in EvtBToVlnuBallFF.\n";
::abort();
}
void EvtBToVlnuBallFF::getdiracff( EvtId, EvtId, double, double, double*,
double*, double*, double*, double*, double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :getdiracff in EvtBToVlnuBallFF.\n";
::abort();
}
void EvtBToVlnuBallFF::getraritaff( EvtId, EvtId, double, double, double*,
double*, double*, double*, double*, double*,
double*, double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :getraritaff in EvtBToVlnuBallFF.\n";
::abort();
}

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