Abstract
As shown in Allanach et al. (Global fits of third family hypercharge models to neutral current B-anomalies and electroweak precision observables. arXiv:2103.12056), the Third Family Hypercharge ( Y3 ) Model changes the Standard Model prediction for MW whilst simultaneously explaining anomalies in b → sℓℓ transitions via a heavy Z' gauge boson which is spawned by a spontaneously broken gauged U(1)Y3 symmetry. The 2022 CDF II measurement of MW , which is far from the Standard Model prediction in the statistical sense, somewhat disfavours the Y3 model. Here, we generalise the gauge charge assignments to the anomaly-free combination sY3 + t(B3 - L3) and show that incorporating the 2022 CDF II measurement of MW selects a viable domain of integers s and t. For example, s = 1, t = - 3 yields a p value of .08 in a two-parameter global fit to 277 electroweak and flavour changing b data, much improving a SM p value of 1 × 10-6 .