Nucleon-decay-like signatures of Hylogenesis

TL;DR

This paper explores nucleon-decay-like signals from hylogenesis dark matter interactions, calculates their rates, derives bounds from neutron decay experiments, and proposes new decay channels to guide future underground dark matter searches.

Contribution

It introduces new nucleon-decay-like processes in the hylogenesis model, estimates their rates, and assesses their detectability in upcoming experiments, expanding the understanding of antibaryonic dark matter signatures.

Findings

Bounds on model parameters from neutron decay experiments.

Proposed new decay channels with potential for future detection.

Estimated nucleon lifetime limits for these channels.

Abstract

We consider nucleon-decay-like signatures of the hylogenesis, a variant of the antibaryonic dark matter model. For the interaction between visible and dark matter sectors through the neutron portal, we calculate the rates of dark matter scatterings off neutron which mimic neutron-decay processes $n\to \nu\gamma$ and $n\to \nu e^+ e^-$ with richer kinematics. We obtain bounds on the model parameters from nonobservation of the neutron decays by applying the kinematical cuts adopted in the experimental analyses. The bounds are generally (much) weaker than those coming from the recently performed study of events with a single jet of high transverse momentum and missing energy observed at the LHC. Then we suggest several new nucleon-decay like processes with two mesons in the final state and estimate (accounting for the LHC constraints) the lower limits on the nucleon lifetime with respect to these channels. The obtained values appear to be promising for probing the antibaryonic dark matter at future underground experiments like HyperK and DUNE.