21,421 research outputs found
Rotating Away Proton Decay in Flipped Unification
It is shown that by a simple extension of the fermion sector of flipped SU(5)
models and other flipped models proton decay coming from dimension-6 operators
can be suppressed by fermion mixing angles by an arbitrary amount in a natural
way.Comment: 5 page
Radiative Fermion Mass Hierarchy in a Non-supersymmetric Unified Theory
In non-supersymmetric grand unified models a ``radiative fermion mass
hierarchy" can be achieved in which the spectrum of quark and lepton masses is
determined entirely by physics at the unification scale, with many relations
following from the unified gauge symmetry, and with the masses of the lightest
family arising from loops. A simple, realistic, and predictive model of this
kind is presented. A "doubly lopsided" structure, known to lead to bilarge
neutrino mixing, plays a crucial role in the radiative hierarchy.Comment: 14 page
Comment: Accountability and Independence in Financial Regulation: Checks and Balances, Public Engagement, and Other Innovations
Four Puzzles of Neutrino Mixing
There are four puzzling questions about by the magnitudes of neutrino mixings
and mass splittings. A brief sketch is given of the various kinds of models of
neutrino masses and how they answer these questions. Special attention is given
to so-called "lopsided" models.Comment: 12 pages, LaTeX. Talk at NOON2001 conference, Univ. of Tokyo, Dec.
5-8, 200
Concluding remarks : entrepreneurship in low and moderate income communities
Community development
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