Higher-order asymptotic-freedom corrections to photon-photon scattering

We generalize Witten's calculation of the photon structure function F^γ₂ to the next-to-the-leading order of asymptotic freedom. Except for the second moment of F^γ₂, the result is independent of the unknown matrix elements of quark and gluon operators between the photon states. The nonleading corrections turn out to be large.