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A calculation for the one-loop pion vector form-factor in Resonance ChiralTheory is provided in this talk. The amplitude is computed up tonext-to-leading order in 1/Nc and, by means of high-energy constraints, we areable to produce a prediction for the corresponding O(p4) Chiral PerturbationTheory low energy constant L9(mu)=(7.6+- 0.6) 10^{-3} at the scale mu=770 MeV.

One loop predictions for the pion VFF in Resonance Chiral Theory