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EvtHQETFF.cpp
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EvtHQETFF.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/EvtHQETFF.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>
EvtHQETFF::EvtHQETFF( double hqetrho2, double hqetr1, double hqetr2,
double quadTerm )
{
rho2 = hqetrho2;
r1 = hqetr1;
r2 = hqetr2;
c = quadTerm;
return;
}
EvtHQETFF::EvtHQETFF( double hqetrho2, double quadTerm )
{
rho2 = hqetrho2;
c = quadTerm;
return;
}
void EvtHQETFF::getscalarff( EvtId parent, EvtId, double t, double mass,
double* f0p, double* f0m )
{
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 ha1 = 1 - rho2 * ( w - 1 ) + c * ( w - 1 ) * ( w - 1 );
*f0p = ha1;
*f0m = 0.0;
return;
}
void EvtHQETFF::getvectorff( EvtId parent, EvtId, double t, double mass,
double* a1f, double* a2f, double* vf, double* a0f )
{
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;
*a0f = 0.0;
return;
}
void EvtHQETFF::gettensorff( EvtId, EvtId, double, double, double*, double*,
double*, double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :gettensorff in EvtHQETFF.\n";
::abort();
}
void EvtHQETFF::getbaryonff( EvtId, EvtId, double, double, double*, double*,
double*, double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :getbaryonff in EvtHQETFF.\n";
::abort();
}
void EvtHQETFF::getdiracff( EvtId, EvtId, double, double, double*, double*,
double*, double*, double*, double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :getdiracff in EvtHQETFF.\n";
::abort();
}
void EvtHQETFF::getraritaff( EvtId, EvtId, double, double, double*, double*,
double*, double*, double*, double*, double*, double* )
{
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Not implemented :getraritaff in EvtHQETFF.\n";
::abort();
}

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