Models predict total cross-sections for photon-photon collisions, indicating differences in extrapolations at high energies.
We discuss models for total cross-sections, show their predictions for photon-photon col-lisions and compare them with the recent LEP measurements. We show that the extrapo-lations to high center of mass energies within various models differ by large factors at high energies and discuss the precision required fromfuture measurements at the proposed Linear Collider which would allow to distinguish between them.
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R.M. et al. (1999) studied this question.
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