Consequences of t-channel unitarity for the interaction of real and virtual photons at high energies

Details Consequences of t-channel unitarity for the interaction of real and virtual photons at high energies Consequences of t-channel unitarity for the interaction of real and virtual photons at high energies

2002-11-28

arxiv.org/abs/hep-ph/0211448v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX2e with kluwer.sty, 7 figures. Talk presented at the Second International "Cetraro" Workshop & NATO Advanced Re

Scientific paper

We analyze the consequences of t-channel unitarity for photon cross sections and show what assumptions are necessary to allow for the existence of new singularities at $ Q^{2}=0 $ for the $ \gamma p $ and $ \gamma \gamma $ total cross sections. For virtual photons, such singularities can in general be present, but we show that, apart from the perturbative singularity associated with $ \gamma ^{*}\gamma ^{*}\to q\bar q $, no new ingredient is needed to reproduce the data from LEP and HERA, in the Regge region.

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