12,877 research outputs found
Explicitly broken lepton number at low energy in the Higgs triplet model
We suppose that lepton number is explicitly broken at low energy scale(M) in
the framework of the Higgs triplet() model. The scalar sector of the
model is developed considering the particular assumption
eV. We show that such assumption infers a particular mass spectrum for the
scalars that compose the triplet and cause a decoupling of these scalars from
those that compose the standard scalar doublet.Comment: Minor changes, New references added, To appear at MPL
Improving Medicaid Managed Care for Youth With Serious Behavioral Health Needs: A Quality Improvement Toolkit
Profiles successful initiatives by Medicaid managed care organizations in a collaboration to implement systems of care emphasizing early identification, coordination and management, and various services and supports in the least restrictive settings
A Statistical Model to Explain the Mendel--Fisher Controversy
In 1866 Gregor Mendel published a seminal paper containing the foundations of
modern genetics. In 1936 Ronald Fisher published a statistical analysis of
Mendel's data concluding that "the data of most, if not all, of the experiments
have been falsified so as to agree closely with Mendel's expectations." The
accusation gave rise to a controversy which has reached the present time. There
are reasonable grounds to assume that a certain unconscious bias was
systematically introduced in Mendel's experimentation. Based on this
assumption, a probability model that fits Mendel's data and does not offend
Fisher's analysis is given. This reconciliation model may well be the end of
the Mendel--Fisher controversy.Comment: Published in at http://dx.doi.org/10.1214/10-STS342 the Statistical
Science (http://www.imstat.org/sts/) by the Institute of Mathematical
Statistics (http://www.imstat.org
Invisible Z decay width bounds on active-sterile neutrino mixing in the (3+1) and (3+2) models
In this work we consider the standard model extended with singlet sterile
neutrinos with mass in the eV range and mixed with the active neutrinos. The
active-sterile neutrino mixing renders new contributions to the invisible Z
decay width which, in the case of light sterile neutrinos, depends on the
active-sterile mixing matrix elements only. We then use the current
experimental value of the invisible Z decay width to obtain bounds on these
mixing matrix elements for both (3+1) and (3+2) models.Comment: 10 pages, 5 figure
Optimal diffusion in ecological dynamics with Allee effect in a metapopulation
How diffusion impacts on ecological dynamics under the Allee effect and
spatial constraints? That is the question we address. Employing a microscopic
minimal model in a metapopulation (without imposing nonlinear birth and death
rates) we evince --- both numerically and analitically --- the emergence of an
optimal diffusion that maximises the survival probability. Even though, at
first such result seems counter-intuitive, it has empirical support from recent
experiments with engineered bacteria. Moreover, we show that this optimal
diffusion disappears for loose spatial constraints.Comment: 16 pages; 6 figure
Piecewise contractions defined by iterated function systems
Let be Lipschitz contractions. Let
, and . We prove that for Lebesgue almost every
satisfying , the piecewise
contraction defined by is
asymptotically periodic. More precisely, has at least one and at most
periodic orbits and the -limit set is a periodic orbit of
for every .Comment: 16 pages, two figure
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