$\Delta B=2$ neutron decay into antiproton mode $n\to \bar{p}{e}^{+}\nu (\bar{\nu })$

Abstract

We discuss the unique baryon number violation by two units neutron decay mode $n\to \bar{p}{e}^{+}\chi$, with $\chi$ being the standard model (SM) neutrino $\nu$ or antineutrino $\bar{\nu }$ or any beyond SM light fermion, in the framework of effective field theory. This mode is kinematically allowed but rarely discussed theoretically or searched for experimentally. We estimate the lower bound on its partial lifetime from that of the dinucleon decay $np\to e^{+}\chi$ per oxygen nucleus ${}^{16}$O set by the Super-Kamiokande experiment, with a conservative bound ${\Gamma }_{n\to \bar{p}{e}^{+}\chi }^{-1}>5.7\times 10^{39}\mathrm{yrs}$. We also discuss its characteristic signature for the future experimental search and astrophysical implications.

6 pages, references updated, expanded discussion, version to appear in PLB

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Cited by in corpus (5)

• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• Leptoquarks, axions and the unification of B, L, and Peccei-Quinn symmetries
• Baryon number violating hydrogen decay
• New chiral structures for baryon number violating nucleon decays
• Dineutron decay into sterile anti-neutrinos in neutron stars and its observable consequences