REACTIONS INITIATED BY 5-PARTON SUBPROCESSES - ONE-LOOP CORRECTIONS

Using the helicity method and recently determined virtual amplitudes, finite one loop higher order corrections (HOC) to processes dominated by 5-parton subprocesses are determined. From the Bremsstrahlung contr ibutions (6-parton subprocesses), those due to soft and collinear part ons are taken into account : thus the totality of virtual, soft and co llinear HOC (= total contribution of distributions) is included. We co nsider <(p)over bar p> --> gamma + gamma + X (tevatron) and pp --> gam ma + gamma + X (LHC) dominated by <(q)over bar q> - gamma gamma g and gq - gamma gamma q. The resulting K-factors well exceed unity.