The extension to the transverse momentum of the statistical parton   distributions
  By extending the statistical distributions to the transverse degree of freedhom, we account for a multiplicative factor in the Fermi-Dirac functions of the light quarks, we were led to introduce in a previous work to comply with experiment. We can also get light antiquark distributions, similar to those we proposed earlier 
Claude Bourrely (CPT), Jacques Soffer (CPT), Franco Buccella