What question did this study set out to answer?

The central aim is to analyze electroweak precision observables in dark photon models with generalized mixing.

March 19, 2026Journal of High Energy Physics0 citationsOpen Access

Electroweak precision constraints on dark photon models with generalized mixing

EBEnrico Bertuzzo CCCsaba CsákiCornell University FHFernanda HullerCornell University

Key Points

The central aim is to analyze electroweak precision observables in dark photon models with generalized mixing.
Conducted a global fit to electroweak precision observables (EWPOs).
Investigated contributions from both kinetic and mass mixing between dark photons and Standard Model gauge bosons.
Calculated tree-level contributions and leading loop corrections to oblique parameters from an extended Higgs sector.
Identified unconstrained regions in the parameter space of the scalar sector.
Established that dark photon masses between 40 GeV and 1 TeV are excluded for moderate vacuum expectation value ratios.
Determined that larger ratios lead to exclusions similar to standard dark photons.

Abstract

A bstract We present a global fit to electroweak precision observables (EWPOs) in dark photon (DP) models containing both kinetic and mass mixing between the DP and the neutral gauge bosons of the Standard Model (SM). Such more general mixing can be the result of an extended scalar sector, which we specify in this paper. We calculate the tree-level contributions to EWPOs due to the mixing with the DP, as well as the leading loop corrections to the oblique parameters due to the extended Higgs sector. In the scalar sector, we find that ample regions of parameter space are still unconstrained by data. In the gauge sector, the excluded region depends strongly on the vacuum expectation values of the scalar fields: for moderate ratios, DP masses in the (40 GeV, 1 TeV) range are excluded; for larger ratios, the limits become indistinguishable from those for standard DPs.

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