Search for diffractive W's in CDF

We present the preliminary results of a search for diffractive W± production in p bar p collisions at √s=1800 GeV. The events used in this search were obtained with the CDF detector by triggering on a high Pt lepton and missing ET. Diffractive W's are tagged by the requirement of a rapidity gap on one side of the η-region. In events with rapidity gaps, the number of diffractive events is determined by using the correlations expected between the η of the lepton, or the sign of its charge, with the side (p or anti p) of the rapidity gap. We find that the ratio of diffractive to non-diffractive events is R = 0.56 ± 1.0% (statistical only). This ratio has been calculated to be 17.2% assuming a pomeron with a hard structure function made up of q bar qpairs of the four light quarks