2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185408An arbitrary term of the epsilon-expansion of dimensionally regulated off-shell massless one-loop three-point Feynman diagram is expressed in terms of log-sine integrals related to the polylogarithms. Using magic connection between these diagrams and two-loop massive vacuum diagrams, the epsilon-expansion of the latter is also obtained, for arbitrary values of the masses. The problem of analytic continuation is also discussed.8 pages, latexHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext