Abstract
We show how any flavour conserving Z ′ model can be made flavour violating and non-universal by introducing mass mixing of quarks and leptons with a fourth family of vector-like fermions with non-universal Z ′ couplings. After developing a general formalism, we focus on two concrete examples, namely a fermiophobic model, and an SO(10) GUT model, and show how they can account for the anomalous B decay ratios R K and \( {R_K}_{{}^{\ast }} \). A similar analysis could be performed for B − L models, E 6 models, composite models, and so on.
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King, S.F. Flavourful Z ′ models for \( {R}_{K^{\left(\ast \right)}} \) . J. High Energ. Phys. 2017, 19 (2017). https://doi.org/10.1007/JHEP08(2017)019
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DOI: https://doi.org/10.1007/JHEP08(2017)019