2005/08/04 by Guido Altarelli, Altarelli, Guido · 2 citations
Chemistry · Engineering · Mathematics · Physics and Astronomy · #Molecular spectroscopy and chirality #Optical Network Technologies #Random Matrices and Applications #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0508053
To be published in the Proceedings of Rencontres de Physique de la Vallée d'Aoste, La Thuile, Italy
arxiv created 2005/08/04 · arxiv updated 2009/12/01
One can make a distinction between "normal" and "special" models. For normal models θ23 is not too close to maximal and θ13 is not too small, typically a small power of the self-suggesting order parameter √(r), with r=Δmsol2/Δmatm2 ∼ 1/35. Special models are those where some symmetry or dynamical feature assures in a natural way the near vanishing of θ13 and/or of θ23- π/4. Normal models are conceptually more economical and much simpler to construct. Here we focus on special models, in particular a recent one based on A4 discrete symmetry and extra dimensions that leads in a natural way to a Harrison-Perkins-Scott mixing matrix.