The recent measurement by the CDF Collaboration of the W boson mass is in
significant tension with the Standard Model expectation, showing a discrepancy
of seven standard deviations. A larger value of mWβ affects the global
electroweak fit, particularly the best-fit values of the Peskin-Takeuchi
parameters S, T (and perhaps U) that measure oblique corrections from new
physics. To meet this challenge, we propose some simple models capable of
generating non-negative S and T, the latter of which faces the greatest
upward pressure from the CDF measurement in scenarios with U=0. Our models
feature weak multiplets of scalars charged under SU(3)cβΓU(1)Yβ, which cannot attain nonzero vacuum expectation values
but nevertheless produce e.g. Tξ =0 given some other mechanism to split
the electrically charged and neutral scalars. We compute the oblique
corrections in these models and identify ample parameter space supporting the
CDF value of mWβ.Comment: 27 pages, 4 figure