include/apfel/hardfactors.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 Hard factors
0013    * Coefficients of the hard function H for the available
0014    * processes.
0015    */
0016   ///@{
0017   /// &alpha;<SUB>s</SUB> correction to the Drell-Yan hard factor
0018   double H1DY();
0019
0020   /// &alpha;<SUB>s</SUB><SUP>2</SUP> correction to the Drell-Yan hard factor
0021   double H2DY(int const& nf);
0022
0023   /// &alpha;<SUB>s</SUB><SUP>3</SUP> correction to the Drell-Yan hard factor
0024   double H3DY(int const& nf);
0025
0026   /// &alpha;<SUB>s</SUB> correction to the SIDIS hard factor
0027   double H1SIDIS();
0028
0029   /// &alpha;<SUB>s</SUB><SUP>2</SUP> correction to the SIDIS hard factor
0030   double H2SIDIS(int const& nf);
0031
0032   /// &alpha;<SUB>s</SUB><SUP>3</SUP> correction to the SIDIS hard factor
0033   double H3SIDIS(int const& nf);
0034
0035   /// &alpha;<SUB>s</SUB><SUP>3</SUP> charge-dependent correction to
0036   /// DY and SIDIS hard factor
0037   double H3Ch();
0038
0039   /// &alpha;<SUB>s</SUB> correction to the H in gg fusion hard factor
0040   double H1ggH();
0041
0042   /// &alpha;<SUB>s</SUB><SUP>2</SUP> correction to the H in gg fusion hard factor
0043   double H2ggH(int const& nf);
0044   ///@}
0045 }