It’s all right(-handed neutrinos): a new W ′ model for the RD∗ $$ {R}_{D^{{}_{\left(\ast \right)}}} $$ anomaly

• Main Authors: Pouya Asadi, Matthew R. Buckley, David Shih
• Format: Article
• Language: English
• Published: SpringerOpen 2018-09-01
• Series: Journal of High Energy Physics
• Subjects: Beyond Standard Model; Heavy Quark Physics
• Online Access: http://link.springer.com/article/10.1007/JHEP09(2018)010

Abstract The measured B-meson semi-leptonic branching ratios R D and RD* $$ {R}_{D^{*}} $$ 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 RD* $$ {R}_{D^{\left(*\right)}} $$ 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.