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 Tools annual

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 Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Family symmetries are possibly the most conservative extension of theStandard Model that attempt explanations of the pattern of fermion masses andmixings. The observed large mixing angles in the lepton sector may be the firstsignal for the presence of a non-Abelian family symmetry. We investigate thepossibilities of simultaneously explaining the observed pattern of masses ofthe quarks (hierarchical masses and small mixing angles) and of the leptons(near tri-bi-maximal mixing, thus large mixing angles). We show that suchcontrasting observations can be achieved naturally via the seesaw mechanism,whether in models with continuous or discrete family symmetries.  We consider also in some detail the constraints on flavour changing neutralcurrents arising from introducing a continuous family symmetry. We show that,for a restricted choice of the flavon sector, continuous family symmetries areconsistent with even the most conservative limits both for the case of gaugemediated supersymmetry breaking and the case of gravity mediated supersymmetrybreaking.

Family symmetries and the origin of fermion masses and mixings