Improving the equivalent-photon approximation in electron--positron collisions
High Energy Physics - Phenomenology
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.hep-ph/9610406,
title = {Improving the equivalent-photon approximation in electron--positron collisions},
author = {Gerhard A. Schuler},
journal= {arXiv preprint arXiv:hep-ph/9610406},
year = {2007}
}
Comments
10 pages, Latex, uses 12pt.sty, no figure