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EvtBToVlnuBallFF.cpp
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EvtBToVlnuBallFF.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: EvtHQETFF.cc
//
// Description: B->Xu l nu with the Ball/Zwicky decay model
// Xu is a vector (rho, rho0, omega)
//
// Modification history:
//
// Wells Wulsin 2008 Aug 14 Module created
//
//------------------------------------------------------------------------
//
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenModels/EvtBToVlnuBallFF.hh"
#include "EvtGenBase/EvtId.hh"
#include <string>
#include "EvtGenBase/EvtPDL.hh"
#include <math.h>
#include <stdlib.h>
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*){
report(ERROR,"EvtGen") << "Not implemented :getvectorff in EvtBToVlnuBallFF.\n";
::abort();
}
void EvtBToVlnuBallFF::gettensorff(EvtId, EvtId, double, double, double*,
double*, double*, double*){
report(ERROR,"EvtGen") << "Not implemented :gettensorff in EvtBToVlnuBallFF.\n";
::abort();
}
void EvtBToVlnuBallFF::getbaryonff(EvtId, EvtId, double, double, double*,
double*, double*, double*){
report(ERROR,"EvtGen") << "Not implemented :getbaryonff in EvtBToVlnuBallFF.\n";
::abort();
}
void EvtBToVlnuBallFF::getdiracff(EvtId, EvtId, double, double, double*, double*,
double*, double*, double*, double*) {
report(ERROR,"EvtGen") << "Not implemented :getdiracff in EvtBToVlnuBallFF.\n";
::abort();
}
void EvtBToVlnuBallFF::getraritaff(EvtId, EvtId, double, double, double*, double*,
double*, double*, double*, double*, double*, double*) {
report(ERROR,"EvtGen") << "Not implemented :getraritaff in EvtBToVlnuBallFF.\n";
::abort();
}

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