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diff --git a/vjet/delta.C b/vjet/delta.C
index 6929c90..bc3ce4a 100644
--- a/vjet/delta.C
+++ b/vjet/delta.C
@@ -1,81 +1,81 @@
#include "vjint.h"
#include "codata.h"
#include "phasespace.h"
#include "settings.h"
#include "coupling.h"
#include "luminosity.h"
#include "mesq.h"
#include "resconst.h"
#include <iostream>
double vjint::logx2min;
double vjint::delta(double x)
{
double fac = gevfb/1000.*coupling::aemmz*asp_.asp_*resconst::Cf;
double q2 = phasespace::m2;
//change of variable to allow integration over 0-1
//"esp" introduced for better behavior at small qt
int esp = 8;
double x2 = exp((1.-pow(x,esp))*logx2min);
double xjac = x2*logx2min*esp*pow(x,(esp-1));
//x2=x2min*exp(1d0/x2min*t)
//xjac=xjac*x2(1d0-x2min)
//compute x1 as a function of x2
double x1 = (opts.sroot*phasespace::mt*phasespace::exppy*x2-q2)/(x2*pow(opts.sroot,2)-opts.sroot*phasespace::mt*phasespace::expmy);
//check x1,x2<1
double tiny = 0.;// !1d-8
if (x1 > 1.-tiny || x2 > 1.-tiny)
return 0.;
//Partonic mandelstam invariants (bug fix in DYqT: th <-> uh)
double sh = x1*x2*pow(opts.sroot,2);
double th = q2-opts.sroot*x1*phasespace::mt*phasespace::expmy;
double uh = q2-opts.sroot*x2*phasespace::mt*phasespace::exppy;
//1/xjj is the jacobian of the integration in dx1 of delta(q2-sh-uh-th) dx1
//following from the change of variable t = q2-sh-uh-th
//dx1 = dt * dx1(t)/dt -> 1/xjj = dx1(t)/dt
double xjj = abs(x2*pow(opts.sroot,2)-opts.sroot*phasespace::mt*phasespace::expmy);
//common factor for all the contributions
double factor = fac/sh;
//compute parton luminosity
luminosity::pdf1(x1);
luminosity::pdf2(x2);
luminosity::calc();
//leading order delta(s2) contributions
double xloqg=(factor/(pow(coupling::NC,2)-1.))*(aqg0_(sh,th,uh,q2)+agq0_(sh,th,uh,q2));
double xloqqb=(factor/coupling::NC)*aqqb0_(sh,th,uh,q2);
double xlo=xloqg+xloqqb;
//next to leading order delta(s2) contributions
double xnlo = 0.;
- if (opts.order == 2)
+ if (opts.order >= 2)
{
double s2 = 0.;
utils_fu_(uh,q2);
utils_(sh,th,uh,q2,s2);
utils_dilog_(sh,th,uh,q2);
double xnloqg = factor/(pow(coupling::NC,2)-1.)
*(bqg1_(sh,th,uh,q2)+bgq1_(sh,th,uh,q2)+
bqg2_(sh,th,uh,q2)+bgq2_(sh,th,uh,q2)+
cqg1_(sh,th,uh,q2)+cgq1_(sh,th,uh,q2)+
cqg2_(sh,th,uh,q2)+cgq2_(sh,th,uh,q2)+
bqg3_(sh,th,uh,q2)+bgq3_(sh,th,uh,q2));
double xnloqqb = factor/coupling::NC
*(bqqb1_(sh,th,uh,q2)+bqqb2_(sh,th,uh,q2)+
cqqb1_(sh,th,uh,q2)+d0aa_(sh,th,uh,q2)+
bqqb3_(sh,th,uh,q2));
xnlo = xnloqg+xnloqqb;
}
return -M_PI*xjac/xjj * (xlo+(asp_.asp_/2./M_PI)*xnlo);
}
diff --git a/vjet/vjint.C b/vjet/vjint.C
index fef125f..6f64fc9 100644
--- a/vjet/vjint.C
+++ b/vjet/vjint.C
@@ -1,449 +1,449 @@
#include "vjint.h"
#include "settings.h"
#include "interface.h"
#include "resconst.h"
#include "cubature.h"
#include "gaussrules.h"
#include "mesq.h"
#include "coupling.h"
#include "scales.h"
#include "phasespace.h"
#include "luminosity.h"
#include "LHAPDF/LHAPDF.h"
#include <iomanip>
#include <math.h>
const double vjint::zmin = 1e-13;//1e-8;
const double vjint::zmax = 1.;//1.-1e-10;//1.-1e-8;
const double vjint::lz = log(zmax/zmin);
int vjint::z1rule;
int vjint::z2rule;
double *vjint::t1;
double *vjint::t2;
double vjint::brz;
double vjint::brw;
void vjint::release()
{
delete[] t1;
delete[] t2;
}
void vjint::init()
{
z1rule = opts.zrule;
z2rule = opts.zrule;
t1 = new double [z1rule];
t2 = new double [z2rule];
double az = 0.;
double bz = 1.;
double cz = 0.5*(az+bz);
double mz = 0.5*(bz-az);
for (int j = 0; j < z1rule; j++)
t1[j] = zmin*pow(zmax/zmin, cz+mz*gr::xxx[z1rule-1][j]);
for (int j = 0; j < z2rule; j++)
t2[j] = zmin*pow(zmax/zmin, cz+mz*gr::xxx[z2rule-1][j]);
//gevpb_.gevpb_ = 3.8937966e8; //MCFM 6.8 value
//gevpb_.gevpb_ = 0.389379e9; //dyres value
//gevpb_.gevpb_ = gevfb/1000.;
// flagch_.flagch_ = 0;
// vegint_.iter_ = 20;
// vegint_.locall_ = 10000;
// vegint_.nlocall_ = 20000;
// dypara_.ss_ = opts.sroot;
// dypara_.s_ = pow(dypara_.ss_,2);
// dypdf_.ih1_ = opts.ih1;
// dypdf_.ih2_ = opts.ih2;
//vjorder_.iord_ = opts.order - 1;
// if (opts.nproc == 3)
// {
// if (opts.useGamma && !opts.zerowidth)
// prodflag_.prodflag_ = 5;
// else
// prodflag_.prodflag_ = 3;
// }
// else if (opts.nproc == 1)
// prodflag_.prodflag_ = 21;
// else if (opts.nproc == 2)
// prodflag_.prodflag_ = 22;
ckm_.vud_ = cabib_.Vud_;
ckm_.vus_ = cabib_.Vus_;
ckm_.vub_ = cabib_.Vub_;
ckm_.vcd_ = cabib_.Vcd_;
ckm_.vcs_ = cabib_.Vcs_;
ckm_.vcb_ = cabib_.Vcb_;
ckm_.vtd_ = 0.;
ckm_.vts_ = 0.;
ckm_.vtb_ = 0.;
double cw2 = 1.- coupling::xw;
// em_.aemmz_ = coupling::aemmz; //sqrt(2.)* ewcouple_.Gf_ *pow(coupling::wmass,2)* ewcouple_.xw_ /M_PI;
brz = 1./dymasses_.zwidth_*coupling::aemmz/24.*coupling::zmass *(pow(-1.+2.*coupling::xw,2)+pow(2.*coupling::xw,2))/(coupling::xw*cw2); //=0.033638
brw = 1./dymasses_.wwidth_*coupling::aemmz*coupling::wmass/(12.*coupling::xw); //=0.10906
//quarks are ordered according to mass:
//1,2,3,4,5,6
//u,d,s,c,b,t
//double equ = 2./3.; //up-quarks electric charge
//double eqd = -1./3.; //down-quarks electric charge
//quarks_.eq_[0]=equ;
//quarks_.eq_[1]=eqd;
//quarks_.eq_[2]=eqd;
//quarks_.eq_[3]=equ;
//quarks_.eq_[4]=eqd;
quarks_.eq_[0] = ewcharge_.Q_[MAXNF+2];
quarks_.eq_[1] = ewcharge_.Q_[MAXNF+1];
quarks_.eq_[2] = ewcharge_.Q_[MAXNF+3];
quarks_.eq_[3] = ewcharge_.Q_[MAXNF+4];
quarks_.eq_[4] = ewcharge_.Q_[MAXNF+5];
//definition of 'generalized' ckm matrix:
// (uu ud us uc ub ut)
// (du dd ds dc db dt)
//ckm=(su sd ss sc sb st)
// (cu cd cs cc cb ct)
// (bu bd bs bc bb bt)
// (tu td ts tc tb tt)
for (int i = 0; i < 6; i++)
for (int j = 0; j < 6; j++)
quarks_.ckm_[j][i] = 0.;
quarks_.ckm_[1][0]=ckm_.vud_;
quarks_.ckm_[2][0]=ckm_.vus_;
quarks_.ckm_[4][0]=ckm_.vub_;
quarks_.ckm_[0][1]=ckm_.vud_;
quarks_.ckm_[3][1]=ckm_.vcd_;
quarks_.ckm_[5][1]=ckm_.vtd_;
quarks_.ckm_[0][2]=ckm_.vus_;
quarks_.ckm_[3][2]=ckm_.vcs_;
quarks_.ckm_[5][2]=ckm_.vts_;
quarks_.ckm_[1][3]=ckm_.vcd_;
quarks_.ckm_[2][3]=ckm_.vcs_;
quarks_.ckm_[4][3]=ckm_.vcb_;
quarks_.ckm_[0][4]=ckm_.vub_;
quarks_.ckm_[3][4]=ckm_.vcb_;
quarks_.ckm_[5][4]=ckm_.vtb_;
quarks_.ckm_[1][5]=ckm_.vtd_;
quarks_.ckm_[2][5]=ckm_.vts_;
quarks_.ckm_[4][5]=ckm_.vtb_;
//definition of 'delta' matrix
for (int i = 0; i < MAXNF; i++)
for (int j = 0; j < MAXNF; j++)
quarks_.delta_[j][i] = 0.;
for (int i = 0; i < MAXNF; i++)
quarks_.delta_[i][i] = 1.;
//definition of tau3's Pauli matrix
for (int i = 0; i < MAXNF; i++)
for (int j = 0; j < MAXNF; j++)
quarks_.tau3_[j][i] = 0.;
//quarks_.tau3_[0][0]=1.;
//quarks_.tau3_[1][1]=-1.;
//quarks_.tau3_[2][2]=-1.;
//quarks_.tau3_[3][3]=1.;
//quarks_.tau3_[4][4]=-1.;
quarks_.tau3_[0][0] = ewcharge_.tau_[MAXNF+2];
quarks_.tau3_[1][1] = ewcharge_.tau_[MAXNF+1];
quarks_.tau3_[2][2] = ewcharge_.tau_[MAXNF+3];
quarks_.tau3_[3][3] = ewcharge_.tau_[MAXNF+4];
quarks_.tau3_[4][4] = ewcharge_.tau_[MAXNF+5];
//definition of constants and couplings
// const2_.ca_ = resconst::CA;
// const2_.xnc_ = coupling::NC;
// const2_.cf_ = resconst::Cf;
// const2_.tr_ = resconst::NF/2.;
// const2_.pi_ = M_PI;
dyqcd_.pi_ = M_PI;
dyqcd_.cf_ = resconst::Cf;
dyqcd_.ca_ = resconst::CA;
dyqcd_.tr_ = resconst::NF/2.;
dyqcd_.xnc_ = coupling::NC;
dyqcd_.nf_ = resconst::NF;
// dycouplings_.alpha0_ = coupling::aemmz;
// dycouplings_.xw_ = coupling::xw;
// dycouplings_.sw_ = sqrt(coupling::xw); // sin_w
// dycouplings_.cw_ = sqrt(1.-coupling::xw); // cos_w
luminosity::init();
}
double vjint::vint(double m, double pt, double y)
{
double q2 = m*m;
//set scales and alpha strong
scales::set(m, pt);
scales::vjet();
/*
if (opts.dynamicscale)
{
scales2_.xmur_ = sqrt(pow(opts.kmuren*m,2) + pow(opts.kpt_muren*pt,2));
scales2_.xmuf_ = sqrt(pow(opts.kmufac*m,2) + pow(opts.kpt_mufac*pt,2));
}
else
{
scales2_.xmur_ = sqrt(pow(opts.kmuren*opts.rmass,2) + pow(opts.kpt_muren*pt,2));
scales2_.xmuf_ = sqrt(pow(opts.kmufac*opts.rmass,2) + pow(opts.kpt_mufac*pt,2));
}
scales2_.xmur2_ = pow(scales2_.xmur_,2);
scales2_.xmuf2_ = pow(scales2_.xmuf_,2);
asnew_.as_ = LHAPDF::alphasPDF(scales2_.xmur_)/M_PI;
*/
//calculate logs of scales
utils_scales_(q2);
//calculate propagators
double cw2 = 1.- coupling::xw;
//if (opts.zerowidth)
// {
// sigs_.sigz_ = brz; // /(16.*cw2)
// sigs_.sigw_ = brw; // /4.
// sigs_.siggamma_ = 0.;
// sigs_.sigint_ = 0.;
// }
//else
// {
//sigs_.sigz_ = brz*dymasses_.zwidth_*q2/(M_PI*coupling::zmass) / (pow(q2-pow(coupling::zmass,2),2)+pow(coupling::zmass,2)*pow(dymasses_.zwidth_,2)); // /(16.*cw2)
//sigs_.sigw_ = brw*dymasses_.wwidth_*q2/(M_PI*coupling::wmass) / (pow(q2-pow(coupling::wmass,2),2)+pow(coupling::wmass,2)*pow(dymasses_.wwidth_,2)); // !/4.
//sigs_.siggamma_ = em_.aemmz_/(3.*M_PI*q2);
//sigs_.sigint_ = -em_.aemmz_/(6.*M_PI)*(q2-pow(coupling::zmass,2)) /(pow(q2-pow(coupling::zmass,2),2)+pow(coupling::zmass,2)*pow(dymasses_.zwidth_,2)) * (-1.+4.*coupling::xw)/(2.*sqrt(coupling::xw*cw2)); // !sqrt(sw2/cw2)/2.
mesq::setpropagators(m);
if (opts.nproc == 3)
sigs_.sigz_ = brz*dymasses_.zwidth_/(M_PI*coupling::zmass)*mesq::propZ;
else
sigs_.sigw_ = brw*dymasses_.wwidth_/(M_PI*coupling::wmass)*mesq::propW;
if (opts.useGamma)
{
sigs_.siggamma_ = coupling::aemmz/(3.*M_PI) * mesq::propG;
sigs_.sigint_ = -coupling::aemmz/(6.*M_PI)* mesq::propZG * (-1.+4.*coupling::xw)/(2.*sqrt(coupling::xw*cw2));
}
//}
//set phase space variables
// internal_.q_ = m;
// internal_.q2_ = pow(m,2);
// internal_.qt_ = pt;
// yv_.yv_ = y;
// yv_.expyp_ = phasespace::exppy;//exp(y);
// yv_.expym_ = phasespace::expmy;//exp(-y);//1./yv_.expyp_;
// if (opts.zerowidth)
// internal_.q_ = opts.rmass;
//call cross section calculation
// int ord = opts.order - 1;
// double res, err, chi2a;
// qtdy_(res,err,chi2a,y,y,ord);
// cout << setprecision(16) << "fortran " << m << " " << pt << " " << " " << y << " " << res << endl;
double res = calc(m, pt, y);
//cout << setprecision(16) << "C++ " << m << " " << pt << " " << " " << y << " " << res << endl;
//Apply conversion factors:
//ds/dqt = ds/dqt2 * dqt2/dqt
//fb = 1000 * pb
return 2*pt*res*1000.;
}
int xdelta_cubature(unsigned ndim, const double x[], void *data, unsigned ncomp, double f[])
{
//f[0] = xdelta_(x);
f[0] = vjint::delta(x[0]);
return 0;
}
//int sing_cubature(unsigned ndim, const double x[], void *data, unsigned ncomp, double f[])
//{
// double zz[2];
// zz[0] = vjint::zmin*pow(vjint::zmax/vjint::zmin,x[0]);
// double jacz1 = zz[0]*vjint::lz;
//
// zz[1] = vjint::zmin*pow(vjint::zmax/vjint::zmin,x[1]);
// double jacz2 = zz[1]*vjint::lz;
//
// f[0] = sing_(zz)*jacz1*jacz2;
// return 0;
//}
double vjint::calc(double m, double pt, double y)
{
clock_t begin_time, end_time;
double q2 = phasespace::m2;
// tm_.tm_ = sqrt(q2+pt*pt);
//kinematical limits on qt (at y = 0) --> possibly not needed, since the phace space is generated within kinematical limits
double z = q2/pow(opts.sroot,2);
double xr = pow(1-z,2)-4*z*pow(pt/m,2);
if (xr < 0)
return 0.;
//kinematical limits on y including qt
double tmpx = (q2+pow(opts.sroot,2))/opts.sroot/phasespace::mt;
double ymax = log((tmpx+sqrt(max(0.,pow(tmpx,2)-4.)))/2.);
double ay = fabs(y);
if (fabs(y) > ymax)
return 0.;
if (fabs(*(long*)& ay - *(long*)& ymax) < 2 ) //check also equality
return 0.;
//...compute as at order=nloop
asp_.asp_ = asnew_.as_*M_PI;
luminosity::cache();
//integration of the delta term
//lower limit of integration for x2
double x2min=(q2-opts.sroot*phasespace::mt*phasespace::expmy)/(opts.sroot*phasespace::mt*phasespace::exppy-pow(opts.sroot,2));
logx2min = log(x2min);
if (x2min >= 1. || x2min < 0.)
{
//cout << "error in x2min " << x2min << " m " << phasespace::m << " pt " << phasespace::qt << " y " << phasespace::y << endl;
return 0.;
}
/*
//pcubature integration
const int ndimx = 1; //dimensions of the integral
const int ncomp = 1; //components of the integrand
void *userdata = NULL;
double integral[1];
double error[1];
const int eval = 0;
const double epsrel = min(1e-4,opts.pcubaccuracy);
const double epsabs = 0.;
//boundaries of integration
double xmin[1] = {0.};
double xmax[1] = {1.};
begin_time = clock();
pcubature(ncomp, xdelta_cubature, userdata,
ndimx, xmin, xmax,
eval, epsabs, epsrel, ERROR_INDIVIDUAL, integral, error);
end_time = clock();
double rdelta = integral[0];
double err = error[0];
if (opts.timeprofile)
cout << setw(10) << "xdelta time" << setw(10) << float( end_time - begin_time ) / CLOCKS_PER_SEC << setw(10) << "result" << setw(10) << rdelta
<< endl;
*/
begin_time = clock();
double rdelta = 0.;
int xrule = opts.xrule;
//start integration
double ax = 0.;
double bx = 1.;
double cx = 0.5*(ax+bx);
double mx = 0.5*(bx-ax);
double jac = mx;
for (int i = 0; i < xrule; i++)
{
double x = cx+mx*gr::xxx[xrule-1][i];
rdelta += delta(x) * jac * gr::www[xrule-1][i];
}
end_time = clock();
if (opts.timeprofile)
cout << setw(10) << "xdelta time" << setw(10) << float( end_time - begin_time ) / CLOCKS_PER_SEC << setw(10) << "result" << setw(10) << rdelta
<< endl;
//integration of non-delta(s2) terms (only at NLO)
//initialise
double rsing = 0.;
begin_time = clock();
- if (opts.order == 2)
+ if (opts.order >= 2)
{
rsing = sing();
/*
////pcubature integration
//const int ndims = 2; //dimensions of the integral
//// boundaries of integration
//double zmn[2] = {zmin,zmin};
//double zmx[2] = {zmax,zmax};
//pcubature(ncomp, sing_cubature, userdata,
// ndims, zmn, zmx,
// eval, epsabs, 1e-4, ERROR_INDIVIDUAL, integral, error);
//rsing = integral[0];
//err = sqrt(err*err + error[0]*error[0]);
//// cout << m << " " << pt << " " << y << " " << integral[0] << " " << error[0] << endl;
//gaussian quadrature
double zz[2];
double az1 = zmin;
double bz1 = zmax;
double cz1=0.5*(az1+bz1);
double mz1=0.5*(bz1-az1);
for (int j = 0; j < z1rule; j++)
{
double z1 = cz1 + mz1*gr::xxx[z1rule-1][j];
double t = t1[j];//zmin*pow(zmax/zmin,z1);
double jacz1=t*lz;
zz[0]=t;
double az2 = zmin;
double bz2 = zmax;
double cz2 = 0.5*(az2+bz2);
double mz2 = 0.5*(bz2-az2);
for (int jj = 0; jj < z2rule; jj++)
{
double z2 = cz2 + mz2*gr::xxx[z2rule-1][jj];
double t = t2[jj];//zmin*pow(zmax/zmin,z2);
double jacz2 = t*lz;
zz[1] = t;
rsing=rsing+sing_(zz)*gr::www[z1rule-1][j]*gr::www[z2rule-1][jj]
//rsing=rsing+sing(zz[0],zz[1])*gr::www[z1rule-1][j]*gr::www[z2rule-1][jj]
*jacz1*jacz2*mz1*mz2;
}
}
//cout << m << " " << pt << " " << y << " " << rsing << endl;
*/
rsing = rsing/2./M_PI;//*(asp_.asp_/2./M_PI);
}
else if (opts.order == 1)
rsing = 0.;
end_time = clock();
if (opts.timeprofile)
cout << setw(10) << "rsing time" << setw(10) << float( end_time - begin_time ) / CLOCKS_PER_SEC << setw(10) << "result" << setw(10) << rsing
<< endl;
//final result
double res = rdelta+rsing;
//cout << m << " " << pt << " " << y << " " << res << endl;
return res;
}

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