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 consider a SU(5) x U(1)_F GUT-flavor model in which the number of effectsthat determine the charged fermions Yukawa matrices is much larger than thenumber of observables, resulting in a hierarchical fermion spectrum with noparticular regularities. The GUT-flavor symmetry is broken by flavons in theadjoint of SU(5), realizing a variant of the Froggatt-Nielsen mechanism thatgives rise to a large number of effective operators. By assuming a common massfor the heavy fields and universality of the fundamental Yukawa couplings, wereduce the number of free parameters to one. The observed fermion mass spectrumis reproduced thanks to selection rules that discriminate among variouscontributions. Bottom-tau Yukawa unification is preserved at leading order, butthere is no unification for the first two families. Interestingly, U(1)_Fcharges alone do not determine the hierarchy, and can only give upper bounds onthe parametric suppression of the Yukawa operators.

Fermion mass hierarchy and non-hierarchical mass ratios in SU(5) x U(1)_F