More on the Hypercharge Portal into the Dark Sector

TL;DR

This paper explores additional interactions between multiple hidden U(1) gauge fields and hypercharge, analyzing their phenomenological implications for dark matter detection and consistency with experimental constraints.

Contribution

It introduces and studies the phenomenology of new dim-4 couplings, similar to Chern-Simons interactions, in models with multiple hidden U(1) groups.

Findings

Hidden vector fields can serve as dark matter candidates.

Monochromatic gamma-ray signals from the galactic center are possible.

Models are consistent with LHC and astrophysical constraints.

Abstract

If the hidden sector contains more than one U(1) groups, additional dim-4 couplings (beyond the kinetic mixing) between the massive U(1) fields and the hypercharge generally appear. These are of the form similar to the Chern-Simons interactions. We study the phenomenology of such couplings including constraints from laboratory experiments and implications for dark matter. The hidden vector fields can play the role of dark matter whose characteristic signature would be monochromatic gamma ray emission from the galactic center. We show that this possibility is consistent with the LHC and other laboratory constraints, as well as astrophysical bounds.