It\u2019s all right(-handed neutrinos): a new W\u2032 model for the {R}_{D^{{}_{left(ast right)}}} anomaly

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The measured B-meson semi-leptonic branching ratios RD and {R}_{D^{*}} have long-standing 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^{left(*right)}} anomaly were strongly constrained from flavor changing neutral currents and direct collider searches for Z′ → τ τ 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.