34,860 research outputs found
Texture-zero model for the lepton mass matrices
We suggest a simple model, based on the type-I seesaw mechanism, for the
lepton mass matrices. The model hinges on an Abelian symmetry which leads to
mass matrices with some vanishing matrix elements. The model predicts one
massless neutrino and ( is the effective light-neutrino
Majorana mass matrix). We show that these predictions perfectly agree with the
present experimental data if the neutrino mass spectrum is inverted, i.e. if
, provided the Dirac phase is very close to maximal (). In the case of a normal neutrino mass spectrum, i.e. when , the
agreement of our model with the data is less than optimal---the reactor mixing
angle is too small in our model. Minimal leptogenesis is not an
option in our model due to the vanishing elements in the Yukawa-coupling
matrices.Comment: 10 pages, 3 figures; version for journal: new fit to data, new plot
New textures for the lepton mass matrices
We study predictive textures for the lepton mass matrices in which the
charged-lepton mass matrix has either four or five zero matrix elements while
the neutrino Majorana mass matrix has, respectively, either four or three zero
matrix elements. We find that all the viable textures of these two kinds share
many predictions: the neutrino mass spectrum is inverted, the sum of the
light-neutrino masses is close to 0.1 eV, the Dirac phase in the
lepton mixing matrix is close to either or , and the mass term
responsible for neutrinoless double-beta decay lies in between 12 and 22 meV.Comment: 31 pages, 6 figure
A remark on the asymptotic form of BPS multi-dyon solutions and their conserved charges
We evaluate the gauge invariant, dynamically conserved charges, recently
obtained from the integral form of the Yang-Mills equations, for the BPS
multi-dyon solutions of a Yang-Mills-Higgs theory associated to any compact
semi-simple gauge group G. Those charges are shown to correspond to the
eigenvalues of the next-to-leading term of the asymptotic form of the Higgs
field at spatial infinity, and so coinciding with the usual topological charges
of those solutions. Such results show that many of the topological charges
considered in the literature are in fact dynamical charges, which conservation
follows from the global properties of classical Yang-Mills theories encoded
into their integral dynamical equations. The conservation of those charges can
not be obtained from the differential form of Yang-Mills equations.Comment: Version to be published in JHEP, Journal of High Energy Physics (19
pages, no figures, some examples added
Comparing the performance of the SF-6D and EQ-5D across diseases
info:eu-repo/semantics/publishedVersio
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