ZEUS
Contributing IPP Scientists: John Martin, Francois Corriveau
Laboratory: DESY
Accelerator: HERA
The initial ZEUS data from HERA have produced a large number of results on a variety of QCD physics topics. These results include new measurements of the structure function of the proton now extended into the very interesting low x kinematic region, observation of diffractive phenomena and rapidity gap events, studies of the nature of Pomeron exchange and several searches for exotic particles. The annual integrated luminosity at HERA has increased significantly each year, making new physics topics accessible. The HERA luminosity reach its design value earlier this decade. With the higher luminosity, the very high Q^2 deep inelastic scattering region was explored. The full program at HERA included measurements with longitudinally polarised electron and positron beams that extended until 2007. The physics program also included searches for new gauge bosons, for compositeness in quarks and leptons, and right-handed weak currents.
At present, the Canadian group consists of 4 physicists, 3 research associates and 3 graduate students from McGill, Toronto, and York. Canada made substantial hardware contributions to both the ZEUS detector and the HERA accelerator. The Canadian group built and maintained the endcap uranium calorimeter including its calibration systems, the third level trigger system, and added a forward neutron detector for the last few years of running. The group remains involved in the physics analyses with over 30 PhD theses completed so far.