2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42184A calculation of the Dalitz decay in next-to-leading order in chiral perturbation theory of two flavour case extended by virtual photons is presented. The whole kinematic sector is covered and realistic experimental situation is discussed.8 pages, 5 figures; presented at Int. Conf. Hadron Structure '02, September 2002, SlovakiaHigh Energy Physics - Phenomenologytext