Constraints on the dark sector from electroweak precision observables

TL;DR

This paper analyzes how electroweak precision measurements, including recent W boson mass data, constrain dark photon models and their interactions with dark matter, providing new bounds on these parameters.

Contribution

It offers the first electroweak precision constraints on dark photon couplings to fermionic dark matter and compares results for different W boson mass measurements.

Findings

Constraints on dark photon parameters vary with W mass values.

New bounds on dark photon-fermion couplings established.

Electroweak data limits dark sector models.

Abstract

We revisit the Standard Model fit to electroweak precision observables using the latest data and the Particle Data Group value of the mass of the W boson. This analysis is repeated for the value reported by CDF. The constraints on the parameter space for dark photons arising from these electroweak precision observables are then evaluated for both values of the W boson mass. We also extend previous work by placing the first electroweak precision observable constraints on the coupling of dark photons to the fermionic dark matter sector.