2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49758We have performed a detailed phenomenological investigation of the hard colour singlet exchange process observed at the Tevatron in events that have a large rapidity gap between outgoing jets. We include the effects of multiple interactions to obtain a prediction for the gap survival factor. Comparing the data on the fraction of gap events with the prediction from BFKL pomeron exchange we find agreement provided that a constant value of alpha_s is used in the BFKL calculation. Moreover, the value of alpha_s is in line with that extracted from measurements made at HERA.5 pages, 5 figures. Talk given at the Tevatron Run 2 QCD and Weak Boson Physics workshop, Nov 4-6 1999High Energy Physics - Phenomenologytext