Dynamical and thermal descriptions in parton distribution functions
  We suggest a duality between the standard (dynamical) and statistical distributions of partons in the nucleons. The temperature parameter entering into the statistical form for the quark distributions is estimated. It is found that this effective temperature is practically the same for the dependence on longitudinal and transverse momenta and, in turn, it is close to the freeze-out temperature in high energy heavy-ion collisions. 
J.Cleymans, G.I.Lykasov, A.S.Sorin, O.V.Teryaev
hep-ph