Abstract.
The total hadronic \(\gamma^{*}\gamma^{*}\) cross sections at high energy are calculated as a function of energy and photon virtuality in a model combining Reggeon exchange, the quark box diagram (a fixed pole in Regge language) and soft and hard pomeron exchanges evaluated in the context of dipole-dipole scattering. Good agreement is obtained with the data for the real \(\gamma\gamma\) cross section and for the real photon structure function \(F_2^\gamma\). However the model prediction for the \(\gamma^{*}\gamma^{*}\) cross section is too small. This is attributed to an incorrect extrapolation of the \(Q^2\) dependence of the hard pomeron adopted here. Parametrising it independently shows that the hard part of the cross section can be well represented by a simple Regge pole with intercept \(\sim 1.3\).
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Received: 19 August 1999 / Published online: 3 February 2000
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Donnachie, A., Dosch, H. & Rueter, M. \(\gamma^* \gamma^*\) reactions at high energies. Eur. Phys. J. C 13, 141–150 (2000). https://doi.org/10.1007/s100520000268
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DOI: https://doi.org/10.1007/s100520000268