$ΔB=2$ neutron decay into antiproton mode $n\to \bar pe^+ν(\barν)$

Xiao-Gang He; Xiao-Dong Ma

doi:10.1016/j.physletb.2021.136298

paper

$Δ B = 2$ neutron decay into antiproton mode $n \to p ˉ e^{+} ν (ν ˉ)$

arXiv:2101.01405 · doi:10.1016/j.physletb.2021.136298

Abstract

We discuss the unique baryon number violation by two units neutron decay mode $n \to p ˉ e^{+} χ$ , with $χ$ being the standard model (SM) neutrino $ν$ or antineutrino $ν ˉ$ 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 $n p \to e^{+} χ$ per oxygen nucleus $^{16}$ O set by the Super-Kamiokande experiment, with a conservative bound $Γ_{n \to p ˉ e^{+} χ}^{- 1} > 5.7 \times 1 0^{39} yrs$ . We also discuss its characteristic signature for the future experimental search and astrophysical implications.

arXiv comment6 pages, references updated, expanded discussion, version to appear in PLB

$Δ B = 2$ neutron decay into antiproton mode $n \to p ˉ e^{+} ν (ν ˉ)$

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ΔB=2 neutron decay into antiproton mode n→pˉ​e+ν(νˉ)

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$Δ B = 2$ neutron decay into antiproton mode $n \to p ˉ e^{+} ν (ν ˉ)$