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RK(*) and the origin of Yukawa couplings

RK(*) and the origin of Yukawa couplings
RK(*) and the origin of Yukawa couplings

We explore the possibility that the semi-leptonic B decay ratios RK(*) 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 RK(*) 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.

Beyond Standard Model, Heavy Quark Physics, Neutrino Physics, Quark Masses and SM Parameters
1126-6708
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538

King, Stephen F. (2018) RK(*) and the origin of Yukawa couplings. Journal of High Energy Physics, 2018 (9), [69]. (doi:10.1007/JHEP09(2018)069).

Record type: Article

Abstract

We explore the possibility that the semi-leptonic B decay ratios RK(*) 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 RK(*) 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.

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Accepted/In Press date: 2 September 2018
e-pub ahead of print date: 13 September 2018
Keywords: Beyond Standard Model, Heavy Quark Physics, Neutrino Physics, Quark Masses and SM Parameters

Identifiers

Local EPrints ID: 423765
URI: http://eprints.soton.ac.uk/id/eprint/423765
ISSN: 1126-6708
PURE UUID: 7f88d41a-f971-4d07-8229-15674b5c59cd

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Date deposited: 01 Oct 2018 16:30
Last modified: 14 Sep 2021 19:21

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