2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44355Radiating a photon from the initial state provides a useful tool for studying a range of low energy physics using a high-energy e+ e- accelerator. Accurate results require careful calculation of the first order virtual photon corrections. We compare exact results for initial state radiative corrections, finding agreement to an order of 10^{-5} or better as a fraction of the Born cross-section for most of the range of photon energies, at CMS energies relevant in both high-energy collision and radiative return experiments.Presented at the Cracow Epiphany Conference on Hadron Spectroscopy, Jan. 4-8, 2005 (7 pages, 4 figures, style package included)High Energy Physics - Phenomenologytext