It's all right(-handed neutrinos): a new W′ model for the RD(*) anomaly

The measured B-meson semi-leptonic branching ratios RD and R-D* have longstanding deviations between theory and experiment. We introduce a model which explains both anomalies through a single interaction by introducing a right-handed neutrino as the missing energy particle. This interaction is mediated by a heavy charged vector boson (W') which couples only to right-handed quarks and leptons of the Standard Model through the mixing of these particles with new vector-like fermions. Previous W' models for the R-D(*) anomaly were strongly constrained from flavor changing neutral currents and direct collider searches for Z' ->tau tau resonances. We show that relying on right-handed fermion mixing enables us to avoid these constraints, as well as other severe bounds from electroweak precision tests and neutrino mixing.