1996/10/18 by G. Schüler, Gerhard A. Schuler, Schuler, Gerhard A. · 1 citation
Medicine · Physics and Astronomy · #Advanced Radiotherapy Techniques #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle Detector Development and Performance #Radiation Therapy and Dosimetry #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9610406
10 pages, Latex, uses 12pt.sty, no figure
arxiv created 1996/10/18 · openalex publication_date 1996/10/18 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.