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 $n\to \bar{\nu }+\text{invisible}$ and $n\to {\pi }^0+\text{invisible}$. In this work, we discuss the possible spontaneous breaking of baryon symmetry in the dark sector and 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 the induced nucleon decay rates in this model depend on the dark matter density, di-nucleon decay processes do not, providing a complementary probe of the new physics. We thus use nucleon and di-nucleon decay bounds to constrain the local density and mass of the anti-baryonic dark matter.

Comments: 19 pages, 7 figures, Accepted to be published in Physical Review D