13,435 research outputs found
Riddle of the Neutrino Mass
We discuss some known approaches and results as well as few new ideas
concerning origins and nature of neutrino mass. The key issues include (i)
connections of neutrino and charged fermions masses, relation between masses
and mixing, energy scale of new physics behind neutrino mass where
possibilities spread from the Planck and GUT masses down to a sub-eV scale. The
data hint two different new physics involved in generation of neutrino mass.
Determination of the CP phase as well as mass hierarchy can play important role
in identification of new physics. It may happen that sterile neutrinos provide
the key to resolve the riddle.Comment: 6 pages, talk given at the Neutrino Oscillation Workshop, NOW 2014,
Conca Specchiulla (Otranto, Lecce, Italy), September 7 - 14, 201
Solar Neutrinos and Lepton Mixing
With latest experimental data the solar neutrino problem enters new phase
when crucial aspects of the problem can be formulated in an essentially (solar)
model independent way. Original neutrino fluxes can be considered as free
parameters to be found from the solar neutrino experiments. Resonance flavour
conversion gives the best fit of all experimental results. Already existing
data allow one to constraint both the neutrino parameters and the original
neutrino fluxes. The reconciliation of the solution of the solar neutrino
problem with other neutrino mass hints (atmospheric neutrino problem, hot dark
matter etc.) may require the existence of new very light singlet fermion.
Supersymmetry can provide a framework within which the desired properties of
such a light fermion follow naturally. The existence of the fermion can be
related to axion physics, mechanism of -term generation etc..Comment: 9 pages, LaTeX, no figures. Talk given at the XXXth Rencontres de
Moriond on Electroweak and Unified Theories, Les Arcs, Savoie - France, March
11 - 18, 199
Neutrino masses and mixing: Leptons versus Quarks
Comparison of properties of quark and leptons as well as understanding their
similarities and differences is one of the milestones on the way to underlying
physics. Several observations, if not accidental, can strongly affect the
implications: (i) nearly tri-bimaximal character of lepton mixing, (ii) special
neutrino symmetries, (iii) the QLC-relations. We consider possible connections
between quarks and leptons which include the quark-lepton symmetry and
unification, approximate universality, and quark-lepton complementarity.
Presence of new neutrino states and their mixing with the left or/and right
handed neutrinos can be the origin of additional differences of quarks and
leptons.Comment: Latex, pdproc.sty, 19 pages, 3 figures, Talk given at the III
International Workshop on: NO-VE "Neutrinos in Venice", Fifty years after the
Neutrino discovery, 7-10 Feb 2006, Venice, Ital
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