Improved Upper Limits on Baryon-Number Violating Dinucleon Decays to Dileptons

Abstract

We consider effects of $n-\bar{n}$ oscillations and resultant matter instability due to dinucleons decays. We point out that existing upper bounds on the rates for the dinucleon decays $nn\to 2{\pi }^0$, $nn\to {\pi }^{+}{\pi }^{-}$, and $np\to {\pi }^{+}{\pi }^0$ imply upper bounds on the rates for dinucleon decays to dileptons $nn\to e^{+}{e}^{-}$, $nn\to {\mu }^{+}{\mu }^{-}$, $nn\to {\nu }_{\ell }{\bar{\nu }}_{\ell }$, and $np\to {\ell }^{+}{\nu }_{\ell }$, where $\ell =e,\mu ,\tau$. We present estimates for these upper bounds. Our bounds are substantially stronger than corresponding limits from direct searches.

6 pages, 3 figures

References in corpus (5)

• Simplified models with baryon number violation but no proton decay
• Realistic calculations of nuclear disappearance lifetimes induced by neutron-antineutron oscillations
• Search for dinucleon decay into pions at Super-Kamiokande
• Improved Lower Bounds on Partial Lifetimes for Nucleon Decay Modes
• Two Nucleon (B-L)-Conserving Reactions Involving Tau Leptons

Cited by in corpus (4)

• Inclusive Nucleon Decay Searches as a Frontier of Baryon Number Violation
• Neutrino Masses and Mixing in Models with Large Extra Dimensions and Localized Fermions
• Using $\bar{p}p$ and $e^{+}{e}^{-}$ Annihilation Data to Refine Bounds on the Baryon-Number-Violating Dinucleon Decays $nn\to e^{+}{e}^{-}$ and $nn\to {\mu }^{+}{\mu }^{-}$
• $\Delta B=2$ neutron decay into antiproton mode $n\to \bar{p}{e}^{+}\nu (\bar{\nu })$