125 research outputs found
The quest for the neutrino mass spectrum
This article provides a (semi-)popular introduction to the phenomenology of
neutrino masses.Comment: 19 pages, 6 figure
Neutrinoless double beta decay and new physics in the neutrino sector
Neutrinoless double beta decay belongs to the most sensitive tools for the
search of new physics beyond the standard model. The recent half life limit of
the Heidelberg-Moscow experiment implies restrictive bounds on the absolute
mass scale in the neutrino sector. Possible improvements by the GENIUS project
provide a unique possibility to reconstruct the neutrino mass spectrum. Further
constraints on new interactions in the neutrino sector are given in a
model-independent way. Consequences for neutrino anomalies and theories beyond
the standard model such as left-right symmetric models, R-parity violating SUSY
and leptoquarks are discussed. The potential of double beta decay experiments
in the search for WIMP dark matter is reviewed.Comment: Plenary talk presented by H. Paes at COSMO99, Trieste/Italy, 8 pages,
1 figure, requires ws-p8-50x6-00.cl
A general parametrization for the long-range part of neutrinoless double beta decay
Double beta decay has been proven to be a powerful tool to constrain
violating physics beyond the standard model. We present a representation for
the long-range part of the general decay rate allowed by
Lorentz-invariance. Combined with the short range part this general
parametrization in terms of effective violating couplings will provide
the limits on arbitrary lepton number violating theories.Comment: Talk presented by H. P\"as at the Erice School on Nuclear Physics,
19th course "Neutrinos in Astro, Particle and Nuclear Physics", Erice, Italy,
16-24 September 1997, 2 pages, Latex, requires worldsci.st
Effects of New Gravitational Interactions on Neutrinoless Double Beta Decay
It has recently been proposed that violations of Lorentz invariance or
violations of the equivalence principle can be constrained from the
non-observation of neutrinoless double beta decay. We generalize this analysis
to all possible new gravitational interactions and discuss briefly the
constraints for different cases.Comment: 10 page
Double beta decay and the extra-dimensional seesaw mechanism
We study the model-building conditions under which an observable 0vBB decay
signal is predicted due to Kaluza-Klein singlet neutrinos in theories with
large extra dimensions. Our analysis is based on 5-dimensional singlet-neutrino
models compactified on an S^1/Z_2 orbifold, where the Standard-Model fields are
localized on a 3-brane. We show that sizeable 0vBB rates within the above
minimal 5-dimensional framework would require a non-vanishing shift of the
3-brane from the orbifold fixed points by an amount smaller than the typical
scale 100 inverse MeV characterizing the Fermi nuclear momentum. The resulting
5-dimensional models predict a sizeable effective Majorana-neutrino mass that
could be several orders of magnitude larger than the light neutrino masses.Comment: 12 pages, 2 figures, talk presented by H. Paes at AHEP-2003,
Valencia, Spai
Leptoquark patterns unifying neutrino masses, flavor anomalies, and the diphoton excess
Vector leptoquarks provide an elegant solution to a series of anomalies and
at the same time generate naturally light neutrino masses through their mixing
with the standard model Higgs boson. We present a simple Froggatt-Nielsen model
to accommodate the B physics anomalies and , neutrino masses, and
the GeV diphoton excess in one cohesive framework adding only two vector
leptoquarks and two singlet scalar fields to the standard model field content.Comment: 12 pages, 10 figures; final version published in PR
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