Search for antiproton decay at the Fermilab Antiproton Accumulator

A search for antiproton decay has been made at the Fermilab Antiproton Accumulator. Limits are placed on 13 antiproton decay modes. The results include the first explicit experimental limits on the muonic decay modes of the antiproton, and the first limits on the decay modes e^-γγ and e^-ω. The most stringent limit is for the decay mode p¯-->e^-γ. At 90% C.L. we find that τ_p¯/B(p¯-->e^-γ)>7×10⁵ yr. The most stringent limit for decay modes with a muon in the final state is for the decay p¯-->μ^-γ. At 90% C.L. we find that τ_p¯/B(p¯-->μ^-γ)>5×10⁴ yr.