1,343 research outputs found
SLIM at LHC: LHC search power for a model linking dark matter and neutrino mass
Recently a model has been proposed that links dark matter and neutrino
masses. The dark matter candidate which is dubbed as SLIM has a mass of MeV
scale and can show up at low energy experiments. The model also has a high
energy sector which consists of a scalar doublet, . We
discuss the potential of the LHC for discovering the new scalars. We focus on
the and production and the subsequent decay
of the charged scalar to a charged lepton and the SLIM which appears as missing
energy. Identifying the background, we estimate the signal significance and
find that it can exceed at 30 for the 14 TeV run at
the LHC. We comment on the possibility of extracting the flavor structure of
the Yukawa couplings which also determine the neutrino mass matrix. Finally, we
discuss the prospects of this search at the current 7 TeV run of the LHC.Comment: 26 pages, 21 figure
Activating the 4th Neutrino of the 3+1 Scheme
Non-Standard Interactions (NSI) of neutrinos with matter has received renewed
interest in recent years. In particular, it has been shown that NSI can
reconcile the solution with IceCube atmospheric data with
GeV, provided that the effective coupling of NSI is large, e.g. .
The main goal of the present paper is to show that contrary to intuition, it is
possible to build viable models with large NSI by invoking a new gauge
symmetry with gauge boson of mass eV. We refer to these new
constructions as models. In the framework of a solution to
LSND and MiniBooNE anomalies, we show that this novel NSI can help to solve the
tension with cosmological bounds and constraints from IceCube atmospheric data
with GeV. We then discuss the implications of the MINOS and MINOS+
results for the 3+1+ scenario.Comment: 24 pages, 5 figure
Dirac neutrino mass generation from dark matter
In 2006, a simple extension of the Standard Model was proposed in which
neutrinos obtain radiative Majorana masses at one-loop level from their
couplings with dark matter, hence the term "scotogenic," from the Greek
"scotos" meaning darkness. Here an analogous mechanism for Dirac neutrino
masses is discussed in a minimal model. In different ranges of the parameter
space, various candidates for dark matter are possible. In particular, the
lightest Dirac fermion which appears in the loop diagram generating neutrino
mass can be a viable dark matter candidate. Such a possibility does not exist
for the Majorana case. Realistic neutrino mixing in the context of is
discussed. A possible supersymmetric extension is also briefly discussed.Comment: 17 pages, 2 figures; v3: version to appear in PR
Mapping complexity sources in nuclear power plant domains
Understanding the sources of complexity in advanced Nuclear Power Plant (NPP) control rooms and their effects on human reliability is critical for ensuring safe performance of both operators and the entire system. New generation control rooms will rely more heavily on automation and computerized Human-System Interfaces (HSI). Without proper management, information representation and required operator-system interaction could challenge operator information processing capabilities. This paper provides an initial step in assessing the sources of complexity in the NPP control rooms and introduces a systems-theoretic descriptive model of these sources of complexity leveraging network theory.U.S. Nuclear Regulatory Commissio
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