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Using the Resonance Chiral Theory Lagrangian, we perform a calculation of thevector form factor of the pion at the next-to-leading order (NLO) in the 1/N(C)expansion. Imposing the correct QCD short-distance constraints, one fixes theamplitude in terms of the pion decay constant F and resonance masses. Its lowmomentum expansion determines then the corresponding O(p4) and O(p6) low-energychiral couplings at NLO, keeping control of their renormalization scaledependence. At mu0=0.77 GeV, we obtain L9(mu0) = (7.9 \pm 0.4) 10^{-3} andC88(mu0)-C90(mu0)=(-4.6 \pm 0.4) 10^{-5}.

The vector form factor at the next-to-leading order in 1/N(C): chiral couplings L9(mu) and C88(mu) - C90(mu)