Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-09
Phys.Lett. B449 (1999) 299-305
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages; 3 figures as PS files (1 figure added); modified text; added references. To appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(99)00096-9
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.
Kim H.-Ch.
Schroers Wolfram
Stefanis N. G.
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