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The scattering of two off-shell photons is an infrared-safe process in QCD. For photon virtualities Q in the range of a few GeV, accessible at the CERN e+e- collider LEP II, power-behaved contributions in (ΛQCD/Q)n to the total cross section may become non-negligible. Based on a dispersion relation for the running coupling, we discuss these contributions and calculate the coefficients of the leading power correction for transversely polarized and longitudinally polarized virtual photons

Effective QCD Coupling and Power Corrections to Photon-Photon Scattering