Dark matter and a new gauge boson through kinetic mixing

TL;DR

This paper explores a hidden sector dark matter model with a new gauge boson kinetically mixed with the Standard Model, analyzing constraints, detection prospects, and collider signatures.

Contribution

It introduces a detailed analysis of kinetic mixing effects on dark matter detection and collider signals, providing updated constraints and future detection prospects.

Findings

Dark matter-nucleon cross section below current limits but within future sensitivity.

Constraints from low energy, electroweak, and relic density data on model parameters.

Potential collider detection of the hidden gauge boson via dimuon decay channel.

Abstract

We consider a hidden sector model of dark matter which is charged under a hidden U(1)_X gauge symmetry. Kinetic mixing of U(1)_X with the Standard Model hypercharge U(1)_Y is allowed to provide communication between the hidden sector and the Standard Model sector. We present various limits on the kinetic mixing parameter and the hidden gauge coupling constant coming from various low energy observables, electroweak precision tests, and the right thermal relic density of the dark matter. Saturating these constraints, we show that the spin-independent elastic cross section of the dark matter off nucleons is mostly below the current experimental limits, but within the future sensitivity. Finally, we analyze the prospect of observing the hidden gauge boson through its dimuon decay channel at hadron colliders.