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We explore the possibility of resolving simultaneously the $W$-boson massshift reported by the CDF collaboration and the apparent deviation fromunitarity in the first row of the CKM mixing matrix in a class of left-rightsymmetric models. The fermion masses are generated in these models through auniversal seesaw mechanism, utilizing vector-like partners of the usualfermions. We find a unique solution to the two anomalies where the mixing ofthe down quark with a vector-like quark (VLQ) resolves the CKM unitaritypuzzle, and the mixing of the top quark with a VLQ partner explains the $W$boson mass shift. The validity of this setup is tested against the stability ofthe Higgs potential up to higher energies. We find upper bounds of$(5,\,4,\,4)$ TeV on the masses of the down-type VLQ, the top-partner VLQ, anda neutral scalar associated with $SU(2)_R$ gauge symmetry breaking,respectively. This class of models can solve the strong CP problem via paritysymmetry without the need for an axion.

Resolving ${\bf W}$ Boson Mass Shift and CKM Unitarity Violation in Left-Right Symmetric Models with Universal Seesaw