EXTRA_XS/NLO/Logarithms.H

0001 #ifndef EXTRAXS__NLO__Logarithms_H
0002 #define EXTRAXS__NLO__Logarithms_H
0003
0004 #include "ATOOLS/Math/MathTools.H"
0005
0006 using namespace ATOOLS;
0007
0008 namespace EXTRAXS {
0009
0010   inline double HTheta(const double &x)
0011   {
0012     return x>0.0?1.0:0.0;
0013   }
0014
0015   inline Complex LnRat(const double &x,const double &y)
0016   {
0017     return log(dabs(x/y))-Complex(0.0,M_PI)*(HTheta(-x)-HTheta(-y));
0018   }
0019
0020   Complex L0(const double &x,const double &y);
0021   Complex L1(const double &x,const double &y);
0022   Complex L2(const double &x,const double &y);
0023
0024   Complex Ls0(const double &x1,const double &y1,
0025           const double &x2,const double &y2);
0026   Complex Ls1(const double &x1,const double &y1,
0027           const double &x2,const double &y2);
0028   Complex Lsm1(const double &x1,const double &y1,
0029            const double &x2,const double &y2);
0030
0031 }// end of namespace EXTRAXS
0032
0033 #endif