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 show that in see-saw models with small or even vanishing lepton mixingangle $\theta_{12}$, maximal $\theta_{23}$, zero $\theta_{13}$ and zero CPphases at the GUT scale, the currently favored LMA solution of the solarneutrino problem can be obtained in a rather natural way by RenormalizationGroup effects. We find that most of the running takes place in the energyranges above and between the see-saw scales, unless the charged lepton Yukawacouplings are large, which would correspond to a large $\tan \beta$ in theMinimal Supersymmetric Standard Model (MSSM). The Renormalization Groupevolution of the solar mixing angle $\theta_{12}$ is generically larger thanthe evolution of $\theta_{13}$ and $\theta_{23}$. A large enhancement occursfor an inverted mass hierarchy and for a regular mass hierarchy with $|m_2 -m_1| \ll |m_2 + m_1|$. We present numerical examples of the evolution of thelepton mixing angles in the Standard Model and the MSSM, in which the currentbest-fit values of the LMA mixing angles are produced with vanishing solarmixing angle $\theta_{12}$ at the GUT scale.Comment: 10 pages, 6 figures; reference added, minor changes in the text;  results unchanged; final version to appear in JHE

Radiative Generation of the LMA Solution from Small Solar Neutrino Mixing at the GUT Scale