2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42338Process of muon (pion) pair production with small invariant mass in the electron-positron high-energy annihilation, accompanied by emission of hard photon at large angles, is considered. We find that the Dell-Yan picture for differential cross section is valid in the charge-even experimental set-up. Radiative corrections both for electron block and for final state block are taken into account.13 pages, 1 figureHigh Energy Physics - Phenomenologytext