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.

arXiv comment6 pages, 3 figures

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Cited by in corpus (14)

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• Low Energy Effective Field Theory Operator Basis at $d\le 9$
• Nucleon Decay and $n$-$\bar{n}$ Oscillations in a Left-Right Symmetric Model with Large Extra Dimensions
• Neutrino Masses and Mixing in Models with Large Extra Dimensions and Localized Fermions
• Theoretical Analysis of Antineutron-Nucleus Data needed for Antineutron Mirrors in Neutron-Antineutron Oscillation Experiments
• A new approach to search for free neutron-antineutron oscillations using coherent neutron propagation in gas
• Using $\bar{p}p$ and $e^{+}{e}^{-}$ Annihilation Data to Refine Bounds on the Baryon-Number-Violating Dinucleon Decays $nn\to e^{+}{e}^{-}$ and $nn\to {\mu }^{+}{\mu }^{-}$
• An EFT toolbox for baryon and lepton number violating dinucleon to dilepton decays
• Baryon Number Violation: From Nuclear Matrix Elements to BSM Physics
• Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions
• $\Delta B=2$ neutron decay into antiproton mode $n\to \bar{p}{e}^{+}\nu (\bar{\nu })$
• Dineutron decay into sterile anti-neutrinos in neutron stars and its observable consequences
• Neutrino Mass Induced $n$-$\overline{n}$ Oscillation