Abstract
The total hadronic cross-section σ γγ for the interaction of real photons, γγ → hadrons, is extracted from a measurement of the cross-section of the process e + e − → e + e −γ ∗γ ∗ → ( e + e − + hadrons) using a luminosity function for the photon flux and form factors for extrapolating to Q 2 = 0. The data was taken with the OPAL detector at LEP at e +e − centre-of-mass energies √ s ee = 161 GeV and 172 GeV. In the energy range 10 ≤ W ≤ 110 GeV the total hadronic γγ cross-section σ γγ is consistent with the Regge behaviour of the total cross-section observed in γp and hadron-hadron interactions.
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