Constraining anti-baryonic dark matter through correlated nucleon decay signatures

Abstract: Baryon number violation in the visible sector induced by anti-baryonic dark matter provides a viable mechanism for low-scale baryogenesis. Two of the most sensitive probes of this scenario are neutron decay processes such as $n \to \text{invisible}$ and $n \to \pi^0 + \text{invisible}$. In this work, we discuss the generation of di-nucleon decay processes such as $nn \to \bar{\nu}\bar{\nu}$ and $nn \to \pi^0\pi^0$ at one-loop, arising from the operators responsible for induced nucleon decays. While nucleon decay rates in this model depend on the local dark matter density, di-nucleon decay processes do not, providing a complementary probe of the new physics. We thus use bounds on both nucleon and di-nucleon decays to constrain the mass and terrestrial density of anti-baryonic dark matter.