Corrections to electroweak precision observables from mixings of an exotic vector boson in light of the CDF $W$-mass anomaly

TL;DR

This paper investigates how mixing between an exotic Z' boson and standard electroweak bosons affects precision observables, providing a potential explanation for the recent CDF W-mass anomaly.

Contribution

It introduces a comprehensive analysis of Z'-boson mixing effects on electroweak parameters and demonstrates their role in explaining the W-mass anomaly.

Findings

Effective couplings and mixing patterns are systematically evaluated.

Calculated oblique parameters show compatibility with the CDF W-mass anomaly.

Mixing contributions can offset negative T' effects, aligning with experimental results.

Abstract

We enumerate various effective couplings that contribute to the mixings between an exotic vector boson $Z^{\prime}$ and the neutral electroweak vector bosons. The miscellaneous mixing patterns can be evaluated perturbatively. The effective oblique parameters $S^{\prime}$, $T^{\prime}$, and $U^{\prime}$ are calculated to compare with the electroweak precision test results. With the contributions to the non-negligible $U^{\prime}$ parameter from the $\epsilon_{B,W}$ parameters and the aid of some other parameters to cancel the negative $T^{\prime}$, the recent CDF $W$-mass anomaly can therefore be explained.