Flavourful $Z^{\prime }$ models for $R_{K^{(\ast )}}$

Abstract

We show how any flavour conserving $Z^{\prime }$ 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 $Z^{\prime }$ 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.

21 pages, references added, typos corrected, to appear in JHEP

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Cited by in corpus (6)

• $B$ decay anomalies and dark matter from vectorlike confinement
• A minimal flavored $U(1{)}^{\prime }$ for $B$-meson anomalies
• Complete Vector-like Fourth Family with ${\mathrm{U}(1)}^{\prime }$: A Global Analysis
• $B$ decay anomalies from nonabelian local horizontal symmetry
• Origin of Yukawa couplings for Higgs and leptoquarks
• New Weinberg operator for neutrino mass and its seesaw origin