Effect of the analytic and frozen coupling constants in QCD up to NNLO   from DIS data
  We give a short review of our recent analysis [1] of the deep inelastic scattering data (provided by BCDMS, SLAC, NMC) on F2 structure function in the non-singlet approximation with up to next-to-next-to-leading-order accuracy and analytic and frozen modifications of the strong coupling constant featuring no unphysical singularity (the Landau pole). Improvement of agreement between theory and experiment, with respect to the case of the standard perturbative definition of the strong coupling constant considered recently in [2], was observed. 
A.V. Kotikov, V.G. Krivokhizhin, B.G. Shaikhatdenov
hep-ph