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We analyze the electromagnetic pion and kaon form factor by includingradiative and higher-twist effects within the framework of resummed pQCD in thespace-like region. We focus on the transition from the perturbative tonon-perturbative behavior in the phenomenological intermediate energy regime.Using a modified k_T factorization scheme with transverse degrees of freedom,we evaluate the non-perturbative soft contributions as distinct from the hardcontributions, ensuring no double counting via the Ward identity at Q^2=0. Thesoft contributions are obtained via local quark-hadron duality while the hardcontributions rest on the well known collinear factorization theorem usingmodel wave functions with modified Brodsky-Huang-Lepage type ansatz anddistribution amplitudes derived from light-cone QCD sum rules. Our analysisshows that the perturbative hard part prevails for large Q^2 beyond 50-100GeV^2, while for low and moderate momentum transfers below 10-16 GeV^2 the softcontributions dominate over the hard part. Thus, we demonstrate the importanceof including the soft contributions for explaining the experimental form-factordata.

Electromagnetic pion and kaon form factors in light-cone resummed perturbative QCD