The Components of the $γ^*γ^*$ Cross Section

Details The Components of the $γ^*γ^*$ Cross Section The Components of the $γ^*γ^*$ Cross Section

2000-01-11

arxiv.org/abs/hep-ph/0001080v1

Eur.Phys.J.C14:511-523,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 12 Postscript figures

Scientific paper

10.1007/s100520000362

We extend our previous treatment of $\gamma^*p$ cross section based on Gribov's hypothesis to the case of photon-photon scattering. With the aid of two parameters, determined from experimental data, we separate the interactions into two categories corresponding to short ("soft") and long ("hard") distance processes. The photon-photon cross section, thus, receives contributions from three sectors, soft-soft, hard-hard and hard-soft. The additive quark model is used to describe the soft-soft sector, pQCD the hard-hard sector, while the hard-soft sector is determined by relating it to the $\gamma^{*}$p system. We calculate and display the behaviour of the total photon-photon cross section and it's various components and polarizations for different values of energy and virtuality of the two photons, and discuss the significance of our results.

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