Abstract
Abstract
We explore the possibility that the semi-leptonic B decay ratios
$$ {R}_{K^{\left(*\right)}} $$
R
K
*
which violate μ − e universality are related to the origin of the fermion Yukawa couplings in the Standard Model. Some time ago, a vector-like fourth family (without a Z′) was used to generate fermion mass hierarchies and mixing patterns without introducing any family symmetry. Recently the idea of inducing flavourful Z′ couplings via mixing with a vector-like fourth family which carries gauged U(1)′ charges has been proposed as a simple way of producing controlled flavour universality violation while elegantly cancelling anomalies. We show that the fusion of these two ideas provides a nice connection between
$$ {R}_{K^{\left(*\right)}} $$
R
K
*
and the origin of Yukawa couplings in the quark sector. However the lepton sector requires some tuning of Yukawa couplings to obtain the desired coupling of Z′ to muons.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
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