Interpreting the $W$-mass anomaly in the vectorlike quark models

TL;DR

This paper investigates seven vectorlike quark models to explain the recent $W$-mass anomaly reported by CDF, identifying three models that can account for the discrepancy within current experimental and theoretical constraints.

Contribution

The study evaluates seven VLQ extensions of the Standard Model, identifying three capable of explaining the $W$-mass anomaly while satisfying various experimental and theoretical constraints.

Findings

Three VLQ models can explain the $W$-mass anomaly.

The involved Yukawa couplings are around 1, similar to the top quark.

Other models either predict negative corrections or require unnatural parameters.

Abstract

The new measurement of $W$-boson mass by the CDF collaboration revealed a remarkable $7\sigma$ disagreement with the Standard Model (SM) prediction. If confirmed by other experiments, then the disagreement strongly indicates the existence of new physics beyond the SM. In this work, seven vectorlike quark (VLQ) extensions of the SM are investigated to interpret the anomaly, and it is found that three can explain the anomaly in broad parameter space. The explanations are consistent with the constraints from oblique parameters, the LHC search for VLQs, the measurements of the properties for the top quark, bottom quark, and Higgs boson, and the perturbativity criterion. The typical size of the involved Yukawa coupling is around 1, which is comparable to the top quark Yukawa coupling in the SM. The other extensions, however, either predict a negative correction to the mass in reasonable parameter space or explain the anomaly by unnatural theoretical input parameters.