New top-flavor models with a seesaw mechanism

A new class of models is constructed in which the third family quarks, but not leptons, experience a new $\mathrm{SU}\left(2\right)\mathrm{}$ or $U\left(1\right)\mathrm{}$ gauge force. Anomaly cancellation enforces the introduction of spectator quarks so that top and bottom quark masses are naturally generated via a seesaw mechanism. We find the new contributions to the $\mathrm{}(S,T,U)\mathrm{}$ parameters and $\mathrm{Zb}\overline{b}$ vertex to be generically small. We analyze how the reasonable flavor mixing pattern can be generated to ensure the top-seesaw mechanism and sufficiently suppress flavor-changing effects for light quarks. Collider signatures for the light Higgs boson and top quark are also discussed.