  The renormalizable Kroll-Lee-Zumino field theory of pions and a neutral
rho-meson is used to determine the scalar form factor of the pion in the
space-like region at next-to-leading order. Perturbative calculations in this
framework are parameter free, as the masses and the rho-pion-pion coupling are
known from experiment. Results compare favourably with lattice QCD
calculations.
