The NNPDF Collaboration

Neural Network Determination

  of Parton Distributions

 
       This webpage provides downloads of the fortran code for neural network parametrizations of the nonsinglet parton distribution function at different perturbative orders, ready for applications, based on all available experimental data.

The parametrization of the nonsinglet parton distribution is presented in the paper:

" Neural network determination of parton distributions:
The nonsinglet case."

  The NNPDF Collaboration :
Luigi Del Debbio , Stefano Forte , Jose Ignacio Latorre , Andrea Piccione and Joan Rojo

  http://arxiv.org/abs/hep-ph/0701xxx

All-in-one download

• Single download of all programs and help: nnqns.tgz

Fortran code and weights

• fortran code: nnqns.f
• neural network weights (read by nnqns.f):
  • LO, alphas=0.130,
  • NLO, alphas=0.116,
  • NLO, alphas=0.118,
  • NLO, alphas=0.120,
  • NNLO, alphas=0.115,

Example

• An example of how to insert the above fortran code is illustrated in example.f