include/apfel/kcs.h

0001 //
0002 // APFEL++ 2017
0003 //
0004 // Author: Valerio Bertone: valerio.bertone@cern.ch
0005 //
0006
0007 #pragma once
0008
0009 namespace apfel
0010 {
0011   /**
0012    * @name Collins-Soper anomalous dimension.
0013    * Coefficients of the Collins-Soper anomalous dimension. The
0014    * expressions are taken from eq. (69)
0015    * https://arxiv.org/pdf/1705.07167.pdf and from eq (D.9) of
0016    * https://arxiv.org/pdf/1604.07869.pdf.
0017    * @note All the expressions do not include an overall factor
0018    * C<SUB>F</SUB> or C<SUB>A</SUB>.
0019    */
0020   ///@{
0021   /// &alpha;<SUB>s</SUB> term
0022   double KCS00();
0023
0024   /// &alpha;<SUB>s</SUB>L term
0025   double KCS01();
0026
0027   /// &alpha;<SUB>s</SUB><SUP>2</SUP> term
0028   double KCS10(int const& nf);
0029
0030   /// &alpha;<SUB>s</SUB><SUP>2</SUP>L term
0031   double KCS11(int const& nf);
0032
0033   /// &alpha;<SUB>s</SUB><SUP>2</SUP>L<SUP>2</SUP> term
0034   double KCS12(int const& nf);
0035
0036   /// &alpha;<SUB>s</SUB><SUP>3</SUP> term
0037   double KCS20(int const& nf);
0038
0039   /// &alpha;<SUB>s</SUB><SUP>3</SUP>L term
0040   double KCS21(int const& nf);
0041
0042   /// &alpha;<SUB>s</SUB><SUP>3</SUP>L<SUP>2</SUP> term
0043   double KCS22(int const& nf);
0044
0045   /// &alpha;<SUB>s</SUB><SUP>3</SUP>L<SUP>3</SUP> term
0046   double KCS23(int const& nf);
0047   ///@}
0048 }