5,801 research outputs found
Charged and Neutral Currents in a 3-3-1 Model with Right-Handed Neutrinos
The charged and the neutral currents are obtained by using a formal
algebraical approach (developed and applied by the author) within the exact
solution of a 3-3-1 gauge model with right-handed neutrinos. The entire
Standard Model phenomenology is recovered without imposing any supplemental
condition, but only by choosing an adecquate set of parameters from the very
beginning of the calculus. A new and rich phenomenology regarding the particles
and their currents occurs as well. The appealing feature of our results resides
in the exact expressions of the currents which need not the adjustment usually
due to the small mixing angle between neutral bosons and
(like in the most of the papers in the literature treating the
same issue). The required mixing was considered and aleready performed as an
intermediate step by the solving method itself, since the physical eigenstates
of those bosons were determined and then identified in the neutral currents.Comment: 14 pages, 1 Table, no figure
An Approach to Relate Viewpoints and Modeling Languages
The architectural design of distributed enterprise applications from the viewpoints of different stakeholders has been proposed for some time, for example, as part of RM-ODP and IEEE 1471, and seems now-a-days to gain acceptance in practice. However, much work remains to be done on the relationships between different viewpoints. Failing to relate viewpoints may lead to a collection of viewpoint models that is inconsistent, and may therefore lead to an incorrect implementation. This paper defines an approach that helps designers to relate different viewpoints to each other. Thereby, it helps to enforce the consistency of the overall design. The results of this paper are expected to be particularly interesting for Model Driven Architecture (MDA) projects, since the proposed models can be used for the explicit definition of the models and relationships between models in an MDA trajectory
The road plan model: Information model for planning road building activities
The general building contractor is presented with an information model as an approach for deriving a high-level work plan of construction activities applied to road building. Road construction activities are represented in a Road Plan Model (RPM), which is modeled in the ISO standard STEP/EXPRESS and adopts various concepts from the GARM notation. The integration with the preceding road design stage and the succeeding phase of resource scheduling is discussed within the framework of a Road Construction Model. Construction knowledge is applied to the road design and the terrain model of the surrounding road infrastructure for the instantiation of the RPM. Issues regarding the implementation of a road planner application supporting the RPM are discussed
The seesaw mechanism at TeV scale in the 3-3-1 model with right-handed neutrinos
We implement the seesaw mechanism in the 3-3-1 model with right-handed
neutrinos. This is accomplished by the introduction of a scalar sextet into the
model and the spontaneous violation of the lepton number. We identify the
Majoron as a singlet under symmetry, which makes it
safe under the current bounds imposed by electroweak data. The main result of
this work is that the seesaw mechanism works already at TeV scale with the
outcome that the right-handed neutrino masses lie in the electroweak scale, in
the range from MeV to tens of GeV. This window provides a great opportunity to
test their appearance at current detectors, though when we contrast our results
with some previous analysis concerning detection sensitivity at LHC, we
conclude that further work is needed in order to validate this search.Comment: about 13 pages, no figure
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