2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/197824We consider the evaluation of D-dimensional conformal invariant integrals which involve spin one-half and spin-one particles. The star-triangle relation for the massless Yukawa theory is derived, and the longitudinal part of the three-point Green function of massless QED is determined to the lowest order in position space. The operator algebraic method of calculating massless Feynman integrals is used for the evaluation.8 pages; one reference added, minor addition in Introduction, version to appear in J. Phys. AHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext