Searching for t → cg at the Fermilab Tevatron

We examine the experimental observability of the decay mode t → cg at the Fermilab Tevatron via the flavor-changing neutral current vertex tcg. We find that with the existing data, one should be able to probe the tcg coupling to a value smaller than indirect limits previously obtained from b → sγ and the measured branching fraction for t → bW, reaching BF(t → cg) ∼ 15%–28%. A data sample of 1 fb−1 (10 fb−1) at s=2 Te may probe the t → cg branching fraction to a level of 2% (0.5%).