The Dark $L_\mu - L_\tau$ Rises via Kinetic Mixing

TL;DR

This paper explores a dark matter model with kinetic mixing in an $L_-$ framework, identifying viable parameter regions that address B-decay anomalies and discussing future experimental constraints.

Contribution

It analyzes the parameter space of a Dirac fermion dark matter model with kinetic mixing in an $L_-$ context, linking it to B-decay anomalies and experimental prospects.

Findings

Viable parameter space exists for dark matter and B-decay anomaly explanation.

Future experiments like XENONnT and DARWIN will tighten constraints.

Current data still allows a large parameter space.

Abstract

We investigate the dark matter phenomenology of a Dirac fermion together with kinetic mixing in the context of an $L_\mu - L_\tau$ model. We analyze which part of the parameter space can provide a viable dark matter candidate and explain the B-decay anomaly, while obeying current data. Although the allowed region of parameter space, satisfying these requirements, is still large at the moment, future direct detection experiments like XENONnT and DARWIN will, in case of null results, significantly strengthen the limits and push the model to a corner of the parameter space.