Search for new particles in CDF

Preliminary results on searches for new particles beyond the Standard Model are presented. The data were taken by the CDF collaboration at the Fermilab bar pp collider at a center of mass energy of 1.8 TeV. Limits on the masses of the gluino and squark in a minimal supersymmetric theory are given. The 90% confidence level asymptotic lower mass limits on each are 150 GeV/c2. A special data run was taken to search for the diffractively produced sextet quark state η6. An η6 with a mass larger than 20 GeV/c2 is excluded at the 95% confidence level. Limits are also set on the pair-production of massive stable charged particles. Unit-charged particles belonging to spin 1/2 color triplets with masses between 50 and 139 GeV/c2 are ruled out at the 95% confidence level as are charge 2/3 particles with masses between 50 and 116 GeV/c2 and charge 4/3 particles with masses between 50 and 140 GeV/c2. 5 refs., 3 figs