The running QCD coupling in the pre-asymptotic region
  We study deviations from the perturbative asymptotic behaviour in the running QCD coupling by analysing non-perturbative measurements of alpha_s (p) at low momenta as obtained from the lattice three-gluon vertex. Our exploratory study provides some evidence for power corrections to the perturbative running proportional to 1/p^2. 
G. Burgio, F. Di Renzo, C. Parrinello, C. Pittori