Improved upper limits on baryon-number violating dinucleon decays to dileptons

Abstract

We consider effects of n−n¯ oscillations and resultant matter instability due to dinucleon decays. We point out that existing upper bounds on the rates for the dinucleon decays nn→2π0, nn→π+π−, and np→π+π0 imply upper bounds on the rates for dinucleon decays to dileptons nn→e+e−, nn→μ+μ−, nn→νℓν¯ℓ, and np→ℓ+νℓ, where ℓ=e,μ,τ. We present estimates for these upper bounds. Our bounds are substantially stronger than corresponding limits from direct searches.

Topics & Concepts