5,220 research outputs found
The Muon Anomalous Magnetic Moment in the Reduced Minimal 3-3-1 Model
We study the muon anomalous magnetic moment in the context of
the reduced minimal 3-3-1 model recently proposed in the literature. In
particular, its spectrum contains a doubly charged scalar () and
gauge boson (), new singly charged vectors () and a
boson, each of which might give a sizeable contribution to the
. We compute the 1-loop contributions from all these new particles
to the . We conclude that the doubly charged vector boson provides
the dominant contribution, and by comparing our results with the experimental
constraints we derive an expected value for the scale of symmetry breaking TeV. We also note that, if the
discrepancy in the anomalous moment is resolved in the future without this
model then the constraints will tighten to requiring TeV with
current precision, and will entirely rule out the model if the expected
precision is achieved by the future experiment at Fermilab.Comment: 19 pages, 4 figure
Neutrino Masses and Absence of Flavor Changing Interactions in the 2HDM from Gauge Principles
We propose several Two Higgs Doublet Models with the addition of an Abelian
gauge group which free the usual framework from flavor changing neutral
interactions and explain neutrino masses through the seesaw mechanism. We
discuss the kinetic and mass-mixing gripping phenomenology which encompass
several constraints coming from atomic parity violation, the muon anomalous
magnetic moment, rare meson decays, Higgs physics, LEP precision data,
neutrino-electron scattering, low energy accelerators and LHC probes.Comment: 54 pages, 10 figure
Scaling treatment of the random field Ising model
Analytic phenomenological scaling is carried out for the random field Ising
model in general dimensions using a bar geometry. Domain wall configurations
and their decorated profiles and associated wandering and other exponents
are obtained by free energy minimization. Scaling
between different bar widths provides the renormalization group (RG)
transformation. Its consequences are (1) criticality at in
with correlation length diverging like for and
for , where is a decoration constant; (2) criticality in dimensions at , , where
, .
Finite temperature generalizations are outlined. Numerical transfer matrix
calculations and results from a ground state algorithm adapted for strips in
confirm the ingredients which provide the RG description.Comment: RevTex v3.0, 5 pages, plus 4 figures uuencode
The Dark Sequential Z' Portal: Collider and Direct Detection Experiments
We revisit the status of a Majorana fermion as a dark matter candidate when a
sequential Z' gauge boson dictates the dark matter phenomenology. Direct dark
matter detection signatures rise from dark matter-nucleus scatterings at bubble
chamber and liquid xenon detectors, and from the flux of neutrinos from the Sun
measured by the IceCube experiment, which is governed by the spin-dependent
dark matter-nucleus scattering. On the collider side, LHC searches for dilepton
and mono-jet + missing energy signals play an important role. The relic density
and perturbativity requirements are also addressed. By exploiting the dark
matter complementarity we outline the region of parameter space where one can
successfully have a Majorana dark matter particle in light of current and
planned experimental sensitivities.Comment: 22 pages, 6 figure
Psilídeos do Brasil (Hemiptera, Psylloidea): surpreendente diversidade de um grupo de insetos fitófagos.
Resumo
Psilídeos no Brasil: 7 - Platycorypha erythrinae (Hemiptera: Psylloidea) em Erythrina crista-galli (Fabaceae).
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