Improving the equivalent-photon approximation in electron--positron collisions

Details Improving the equivalent-photon approximation in electron--positron collisions Improving the equivalent-photon approximation in electron--positron collisions

1996-10-18

arxiv.org/abs/hep-ph/9610406v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, Latex, uses 12pt.sty, no figure

Scientific paper

The validity of the equivalent-photon approximation for two-photon processes in electron--positron collisions is critically examined. Commonly used forms to describe hadronic two-photon production are shown to lead to sizeable errors. An improved two-photon luminosity function is presented, which includes beyond-leading-logarithmic effects and scalar-photon contributions. Comparisons of various approximate expressions with the exact calculation in the case of the total hadronic cross section are given. Furthermore, effects of the poorly known low-Q2 behaviour of the virtual hadronic cross sections are discussed.

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