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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a $SU(5)\times U(1)_F$ supersymmetric model for neutrino massesand mixings that implements the seesaw mechanism by means of the heavy SU(2)singlets and triplets states contained in three adjoints of SU(5). We discusshow Abelian $U(1)_F$ symmetries can naturally yield non-hierarchical lightneutrinos even when the heavy states are strongly hierarchical, and how it canalso ensure that $R$--parity arises as an exact accidental symmetry. Byassigning two flavons that break $U(1)_F$ to the adjoint representation ofSU(5) and assuming universality for all the fundamental couplings, thecoefficients of the effective Yukawa and Majorana mass operators becomecalculable in terms of group theoretical quantities. There is a single freeparameter in the model, however, at leading order the structure of the lightneutrinos mass matrix is determined in a parameter independent way.

Neutrino masses in $SU(5)\times U(1)_F$ with adjoint flavons