Pion form factors with improved infrared factorization
  We calculate electromagnetic pion form factors with an analytic model for $\alpha_{\rm s}(Q^2)$ which is infrared (IR) finite without invoking a ``freezing'' hypothesis. We show that for the asymptotic pion distribution amplitude, $F_{\pi ^{0}\gamma ^{*}\gamma}$ agrees well with the data, whereas the IR-enhanced hard contribution to $F_{\pi}$ and the soft (nonfactorizing) part can jointly account for the data. 
N. G. Stefanis (U. of Bochum), W. Schroers (U. of Wuppertal), and   H.-Ch. Kim (U. of Pusan)