Dijet Production in DPE and Exclusive Dijet Production

Document(s) Web Page       Public Note Contact(s) M. Convery, M. Gallinaro, K. Goulianos, C. Mesropian, K. Terashi Abstract We present preliminary results from studies of dijet events produced in Double Pomeron Exchange (DPE), with some emphasis on results on search for exclusive dijet production. In a sample of about 310 pb-1 of Run II data collected with dedicated diffractive triggers, we observe an excess of data events over backgrounds obtained from inclusive DPE dijet Monte Carlo simulation. The observed excess is consistent with exclusive dijet Monte Carlo predictions in terms of kinematic distribution shapes. The cross sections of observed exclusive dijet events are measured using combinations of inclusive DPE and exclusive dijet Monte Carlo simulations. We also present results from studies of heavy flavor quark jets in DPE, particularly the suppression of the ratio of heavy flavor jets to inclusive jets expected in the exclusive kinematic region. The results are based on a sample of about 200 pb-1 of data collected after the Fall 2004 shutdown. We observe a decreasing trend in the ratio at the exclusive kinematic region and the observed behavior is consistent with what we expect for exclusive dijet signal that is present in the region. Comments Last Update: July 2006       Dataset: 310 pb-1