F\'eeton ($B-L$ Gauge Boson) Dark Matter Testable in Future Direct Detection Experiments

TL;DR

This paper explores the feasibility of detecting Féeton dark matter, a $B-L$ gauge boson, in future direct detection experiments, highlighting enhanced couplings and viable parameter space for experimental verification.

Contribution

It introduces the possibility of a linear combination of $B-L$ and hypercharge symmetries, and demonstrates that future experiments can probe the relevant dark matter parameter space.

Findings

Future experiments like SuperCDMS can detect Féeton dark matter.

Enhanced electron coupling improves detection prospects.

Parameter space consistent with cosmic production is accessible.

Abstract

In this paper, we revisit the f\'eeton (gauge boson of $U(1)_{B-L}$ symmetry) dark matter scenario, and first point out the $U(1)$ gauge symmetry can be a linear combination of the $B-L$ and the SM hypercharge gauge symmetries. With the redefinition of $B-L$ charge of fermions, the coupling between electron and f\'eeton can be enhanced. After showing the parameter space required from the DM stability and cosmic production, we discuss the potential for verifying them in dark matter direct detection experiments. The results show that future experiments, such as SuperCDMS, have a sensitivity to reach the f\'eeton DM region consistent with its cosmic production.