Search for 1/p^2 Corrections to the Running QCD Coupling
  We investigate the occurrence of power terms in the running QCD coupling by analysing non-perturbative measurements of alpha_s (p) at low momenta obtained from the lattice three-gluon vertex. Our exploratory study provides some evidence for power contributions to alpha_s (p) proportional to 1/p^2. Possible implications for physical observables are discussed. 
G. Burgio, F. Di Renzo (UKQCD Collaboration), C. Parrinello (UKQCD   Collaboration), C. Pittori