2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/214853Virtual corrections for electron--positron annihilation into one real and one off-shell photon of invariant mass Q^2 are evaluated. Special attention is paid to those configurations where the real photon is collinear with the beam direction. This calculation is an important ingredient of a Monte Carlo program, which simulates events with tagged photons from initial-state radiation, including NLO corrections.8 pages, 2 figuresHigh Energy Physics - Phenomenologytext