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EvtBCVFF.cpp
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EvtBCVFF.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: EvtBCVFF.cc
//
// Description: form factors for B->Vlnu
//
// Modification history:
//
// AVL Jul 6, Module created
//
//------------------------------------------------------------------------
//
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenModels/EvtBCVFF.hh"
#include "EvtGenBase/EvtId.hh"
#include <string>
#include <math.h>
#include "EvtGenBase/EvtPDL.hh"
#include <stdlib.h>
#include <iostream>
using namespace std;
EvtBCVFF::EvtBCVFF(int idV, int fit) {
idVector = idV;
whichfit = fit;
//cout<<"==== EvtBCVFF:: idVector="<<idVector<<" whichfit="<<whichfit<<endl;
return;
}
void EvtBCVFF::getvectorff(EvtId,EvtId,
double t, double, double *a1f,
double *a2f, double *vf, double *a0f ){
double q2=t;
if(whichfit == 0) {
*vf = 0;
*a0f = 0;
*a1f = 1;
*a2f=0;
return;
};
if( idVector == EvtPDL::getId("J/psi").getId() ) { // Bc -> J/psi
if(whichfit == 1) { // SR form factor set from [Kiselev, hep-ph/0211021]
double Mbc = 6.277, Mpsi=3.0967; // Experimental values
double Mpole2 = 4.5*4.5, den = 1./(1.-q2/Mpole2);
double FV = 0.11*den,
FAp = -0.071*den,
FA0 = 5.9*den,
FAm = 0.12*den;
*vf = (Mbc + Mpsi)*FV;
*a2f = -(Mbc+Mpsi)*FAp;
*a1f = FA0/(Mbc+Mpsi);
*a0f = (q2*FAm + (Mbc-Mpsi)*(*a1f)-(Mbc+Mpsi)*(*a2f))/(2*Mpsi);
return;
}
else if(whichfit == 2) { // form factor set from [Ebert, hep-ph/0306306]
*vf = (0.49077824756158533 - 0.0012925655191347828*q2)/(1 - 0.06292520325875656*q2);
*a0f = (0.4160345034630221 - 0.0024720095310225023*q2)/(1 - 0.061603451915567785*q2);
*a1f = (0.4970212860605933 - 0.0067519730024654745*q2)/(1 - 0.050487026667172176*q2);
*a2f = (0.7315284919705497 + 0.0014263826220727142*q2 - 0.0006946090066269195*q2*q2)/(1 - 0.04885587273651653*q2);
return;
};
}
else if(idVector == EvtPDL::getId("psi(2S)").getId()) { // Bc -> psi((2S)
if(whichfit == 1) {
////cout<<"BC2:: psi2S, Kiselev, q2="<<q2<<endl;
double Mbc = 6.277, Mpsi=3.0967, Mpsi2S = 3.686, kappa = Mpsi/Mpsi2S; // Experimental values
double Mpole2 = 4.5*4.5, den=1./(1.-q2/Mpole2);
double FV = 0.11*den*kappa/3.1,
FAp = -0.071*den*kappa/4.9,
FA0 = 5.9*den*kappa/3.5,
FAm = 0.12*den*kappa/2.3;
*vf = (Mbc + Mpsi2S)*FV;
*a2f = -(Mbc+Mpsi2S)*FAp;
*a1f = FA0/(Mbc+Mpsi2S);
*a0f = (q2*FAm + (Mbc-Mpsi2S)*(*a1f)-(Mbc+Mpsi2S)*(*a2f))/(2*Mpsi2S);
return;
}
else if(whichfit == 2) {
////cout<<"BC2:: psi2S, Ebert, q2="<<q2<<endl;
*vf = (0.24177223968739653 - 0.053589051007278135*q2)/(1 - 0.0977848994260899*q2);
*a0f = (0.23996026570086615 - 0.03530198514007337*q2)/(1 - 0.09371162519983989*q2);
*a1f = (0.17418379258849329 - 0.004129699022085851*q2*q2)/(1 + 0.06607665248402918*q2);
*a2f = (0.1352376939112041 - 0.040361722565209444*q2 + 0.003343515369431853*q2*q2)/(1 - 0.1463698128333418*q2);
return;
};
}
else {
report(ERROR,"EvtGen") << "Not implemented :getbaryonff in EvtBCVFF.\n";
::abort();
};
}
void EvtBCVFF::getscalarff(EvtId, EvtId, double, double, double*,
double*){
report(ERROR,"EvtGen") << "Not implemented :getbaryonff in EvtBCVFF.\n";
::abort();
}
void EvtBCVFF::gettensorff(EvtId, EvtId, double, double, double*,
double*, double*, double*){
report(ERROR,"EvtGen") << "Not implemented :getbaryonff in EvtBCVFF.\n";
::abort();
}
void EvtBCVFF::getbaryonff(EvtId, EvtId, double, double, double*,
double*, double*, double*){
report(ERROR,"EvtGen") << "Not implemented :getbaryonff in EvtBCVFF.\n";
::abort();
}
void EvtBCVFF::getdiracff(EvtId, EvtId, double, double, double*, double*,
double*, double*, double*, double*) {
report(ERROR,"EvtGen") << "Not implemented :getdiracff in EvtBCVFF.\n";
::abort();
}
void EvtBCVFF::getraritaff(EvtId, EvtId, double, double, double*, double*,
double*, double*, double*, double*, double*, double*) {
report(ERROR,"EvtGen") << "Not implemented :getraritaff in EvtBCVFF.\n";
::abort();
}

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