2,769 research outputs found
Phenomenology of an extended IDM with loop-generated fermion mass hierarchies
We perform a comprehensive analysis of the most distinctive and important
phenomenological implications of the recently proposed mechanism of sequential
loop generation of strong hierarchies in the Standard Model (SM) fermion mass
spectra. This mechanism is consistently realized at the level of renormalizable
interactions in an extended variant of the Inert Higgs Doublet model,
possessing the additional discrete and
gauge family symmetries, while the matter sectors of the SM are extended by
means of -singlet scalars, heavy vector-like leptons and quarks, as
well as right-handed neutrinos. We thoroughly analyze the most stringent
constraints on the model parameter space, coming from the
collider searches, related to the anomaly in lepton universality, and the muon
anomalous magnetic moment, as well as provide benchmark points for further
tests of the model and discuss possible "standard candle" signatures relevant
for future explorations.Comment: Version accepted for publication in EPJC. arXiv admin note: text
overlap with arXiv:1901.0276
A variant of 3-3-1 model for the generation of the SM fermion mass and mixing pattern
We propose an extension of the 3-3-1 model with an additional symmetry group
and an extended scalar sector. To our
best knowledge this is the first example of a renormalizable 3-3-1 model, which
allows explanation of the SM fermion mass hierarchy by a sequential loop
suppression: tree-level top and exotic fermion masses, 1-loop bottom, charm,
tau and muon masses; 2-loop masses for the light up, down, strange quarks as
well as for the electron. The light active neutrino masses are generated from a
combination of linear and inverse seesaw mechanisms at two loop level. The
model also has viable fermionic and scalar dark matter candidates.Comment: 35 pages, 4 figures. Version accepted for publication in JHE
Tris(2,4-dimethylÂbenzeneÂthiolÂato)phenylÂtin(IV)
In the title compound, [Sn(C6H5)(C8H9S)3], the Sn atom has an approximately tetraÂhedral SNCS3 geometry, with angles at this atom ranging from 105.13 (3) to 113.54 (9)°. The crystal packing does not involve any significant interÂmolecular interÂactions, although the benzene rings are involved in a number of weak intra- and interÂmolecular C—H⋯π interÂactions
Effective interactions for the SM fermion mass hierarchy and their possible UV realization
We built an extended 2HDM theory with a spontaneously broken
global symmetry, where the tree level Universal Seesaw Mechanism generates the
mass hierarchy of the Standard Model charged fermions and the Zee-Babu
mechanism produces tiny active neutrino masses. The third family of SM charged
fermions gets tree level masses from Yukawa interactions involving the Higgs
doublets (for the top quark) and (for the bottom quark and tau
lepton). The model under consideration is consistent with SM fermion masses and
mixings, with the muon and electron anomalies and successfully
accommodates the constraints arising from charged lepton flavor violation and
meson oscillations. The proposed model predicts rates for charged lepton flavor
violating decays within the reach of forthcoming experiments.Comment: 16 pages, 6 captioned figure
Supporting tool for multi-scale energy planning through procedures of data enrichment
Considering the challenge of evaluation of the urban environment from the energy point of view, there is plenty of room to improve the resources currently managed by users, enterprises and public institutions. The goal is to create a tool that supports in the decision making in the energy planning process in specific areas by automatically estimating the energy demand and consumption of buildings using public data and representing the results in a geo-referenced way. The tool will provide a better understanding of what the current status of the buildings is, providing these stakeholders with a larger quantity of useful data about the city environment, including not only the geometric information present in cadastre repositories, but also the data collected from the Energy Performance Certificates (EPCs).
In this case, the data from the cadastre repository are combined with the EPCs for each province, with data about the demanded and consumed energy. The objective is to generate a set of buildings typologies for each province with estimated values for the demand and consumption for each building type. These typologies could be used to generate a map with the energetic values for any municipality of this province.
These results can be injected into GIS (Geographic Information Systems) tools that could show these data in order to evaluate the energy demand/consumption of the municipality easing the energy planning decision-making process, or even into databases for further uses
Sequentially loop-generated quark and lepton mass hierarchies in an extended Inert Higgs Doublet model
Extended scalar and fermion sectors offer new opportunities for generating
the observed strong hierarchies in the fermion mass and mixing patterns of the
Standard Model (SM). In this work, we elaborate on the prospects of a
particular extension of the Inert Higgs doublet model where the SM hierarchies
are generated sequentially by radiative virtual corrections in a fully
renormalisable way, i.e. without adding any non-renormalisable Yukawa terms or
soft-breaking operators to the scalar potential. Our model has a potential to
explain the recently observed and anomalies, thanks to
the non universal assignments of the fermionic fields that yield non
universal couplings to fermions. We explicitly demonstrate the
power of this model for generating the realistic quark, lepton and neutrino
mass spectra. In particular, we show that due to the presence of both
continuous and discrete family symmetries in the considered framework, the top
quark acquires a tree-level mass, lighter quarks and leptons get their masses
at one- and two-loop order, while neutrino masses are generated at three-loop
level. The minimal field content, particle spectra and scalar potential of this
model are discussed in detail.Comment: 19 pages, 3 figures. Published versio
Assessment of Steady and Unsteady Friction Models in the Draining Processes of Hydraulic Installations
The study of draining processes without admitting air has been conducted using only steady friction formulations in the implementation of governing equations. However, this hydraulic event involves transitions from laminar to turbulent flow, and vice versa, because of the changes in water velocity. In this sense, this research improves the current mathematical model considering unsteady friction models. An experimental facility composed by a 4.36 m long methacrylate pipe was configured, and measurements of air pocket pressure oscillations were recorded. The mathematical model was performed using steady and unsteady friction models. Comparisons between measured and computed air pocket pressure patterns indicated that unsteady friction models slightly improve the results compared to steady friction models
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