Search for new particles in the two-jet decay channel with the DO detector

We present the results of a search for the production of new particles decaying into two jets in (p) over barp collisions at roots=1.8 TeV, using the DO 1992-1995 data set corresponding to 109 pb(-1). We exclude at the 95% confidence level the production of excited quarks (q*) with masses below 775 GeV/c(2), the most restrictive limit to date. We also exclude standard-model-like W' (Z') bosons with masses between 300 and 800 GeV/c(2) (400 and 640 GeV/c(2)). A W-' boson with mass <786 GeV/c(2) has been excluded by previous measurements, and our lower limit is therefore the most stringent to date.