We provide an ultraviolet (UV) complete model for the R(D(β)) anomalies,
in which the additional contribution to semi-tauonic bβc transitions
arises from decay to a right-handed sterile neutrino via exchange of a
TeV-scale SU(2)Lβ singlet Wβ². The model is based on an extension of the
Standard Model (SM) hypercharge group, U(1)Yβ, to the SU(2)VβΓU(1)β²
gauge group, containing several pairs of heavy vector-like fermions. We present
a comprehensive phenomenological survey of the model, ranging from the
low-energy flavor physics, direct searches at the LHC, to neutrino physics and
cosmology. We show that, while the Wβ² and Zβ²-induced constraints are
important, it is possible to find parameter space naturally consistent with all
the available data. The sterile neutrino sector also offers rich phenomenology,
including possibilities for measurable dark radiation, gamma ray signals, and
displaced decays at colliders.Comment: 26 pages, 5 figure