English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study a non-universal $U(1)_{X}$ extension of the Standard Model with anextended scalar sector of two doublets and one singlet plus three additionalexotic quarks and two exotic charged leptons on the fermionic sector. In orderto obtain the observed fermion mass hierarchy, an additional $\mathbb{Z}_{2}$discrete symmetry is imposed, where the heaviest fermions acquire their massesfrom three different scales determined by two Higgs doublets and one singlet,whereas the lightest fermions obtain their masses from effective operators upto dimension seven. From chiral anomalies cancellation, the model also includesheavy right-handed neutrinos which get massive via an inverse see-sawmechanism, reproducing the observed mass differences for the active neutrinos.We analyze phenomenological consequences of the model in view of the so-calledflavour anomalies, namely the latest measurement made by Fermilab of theanomalous magnetic moment of the muon $g-2$, and additionally, the fit tosemi-leptonic $B$ meson decays made by different flavour groups, dominatedmainly by the LHCb 2020 data. We obtain that the model can explain the formerat the $1\sigma$ level by means of contributions coming from charged $W^{+}$bosons interacting with exotic Majorana neutrinos at one-loop level, with the$Z'$ boson contribution itself coming from the $U(1)_X$ symmetry beingnegligible. However, we find that the model is able to accommodate the $b\tos\ell^{+}\ell^{-}$ transitions associated to the $B$ meson anomalies only atthe $2\sigma$ level via tree-level $Z'$ boson exchange, while simultaneouslyrespecting various constraints from the recent $R_{K^{(*)}}$ measurements madeby the LHCb, neutrino trident production and $B-\bar B$ oscillations.

A gauged non-universal $U(1)_{X}$ model to study muon $g-2$ and $B$ meson anomalies