58,397 research outputs found
Specular sets
We introduce the notion of specular sets which are subsets of groups called
here specular and which form a natural generalization of free groups. These
sets are an abstract generalization of the natural codings of linear
involutions. We prove several results concerning the subgroups generated by
return words and by maximal bifix codes in these sets.Comment: arXiv admin note: substantial text overlap with arXiv:1405.352
Facets, Tiers and Gems: Ontology Patterns for Hypernormalisation
There are many methodologies and techniques for easing the task of ontology
building. Here we describe the intersection of two of these: ontology
normalisation and fully programmatic ontology development. The first of these
describes a standardized organisation for an ontology, with singly inherited
self-standing entities, and a number of small taxonomies of refining entities.
The former are described and defined in terms of the latter and used to manage
the polyhierarchy of the self-standing entities. Fully programmatic development
is a technique where an ontology is developed using a domain-specific language
within a programming language, meaning that as well defining ontological
entities, it is possible to add arbitrary patterns or new syntax within the
same environment. We describe how new patterns can be used to enable a new
style of ontology development that we call hypernormalisation
Exploring viable vacua of the -symmetric NMSSM
We explore the vacua of the -symmetric Next-to-Minimal Supersymmetric
Standard Model (NMSSM) and their stability by going beyond the simplistic
paradigm that works with a tree-level neutral scalar potential and adheres to
some specific flat directions in the field space. Key effects are demonstrated
by first studying the profiles of this potential under various circumstances of
physical interest via a semi-analytical approach. The results thereof are
compared to the ones obtained from a dedicated package like \veva ~which
further incorporates the thermal effects to the potential. Regions of the
phenomenological NMSSM (pNMSSM) parameter space that render the desired
symmetry breaking (DSB) vacuum absolutely stable, long- or short-lived (in
relation to the age of the Universe) under quantum/thermal tunneling are
delineated. Regions that result in color and charge breaking (CCB) minima are
also presented. It is demonstrated that light singlet scalars along with a
light LSP (lightest supersymmetric particle) having an appreciable singlino
admixture are compatible with a viable DSB vacuum and are much relevant for the
collider experiments.Comment: 52 pages, 19 figures, 4 tables; matches with published versio
Renormalizability and model independent description of Z' signals at low energies
Model independent search for signals of heavy Z' gauge bosons in low-energy
four-fermion processes is analyzed. It is shown that the renormalizability of
the underlying theory containing Z', formulated as a scattering in the field of
heavy virtual states, can be implemented in specific relations between
different processes. Considering the two-Higgs-doublet model as the low-energy
basis theory, the two types of Z' interactions with light particles are found
to be compatible with the renormalizability. They are called the Abelian and
the "chiral" couplings. Observables giving possibility to uniquely detect Z' in
both cases are introduced.Comment: 11 pages, 5 figures, RevTeX. The text of the paper is rewritten to be
more clear and precis
Neutral Higgs-pair production at Linear Colliders within the general 2HDM: quantum effects and triple Higgs boson self-interactions
The pairwise production of neutral Higgs bosons is analyzed in the context of
the future linear colliders, such as the ILC and CLIC, within the general
Two-Higgs-Doublet Model (2HDM). The corresponding cross-sections are computed
at the one-loop level in full compliance with the current phenomenological
bounds and the stringent theoretical constraints inherent to the consistency of
the model. We uncover regions across the 2HDM parameter space, mainly for low
tan\beta near 1 and moderate values of the relevant lambda_5 parameter, wherein
the radiative corrections to the Higgs-pair production cross sections can
comfortably reach 50% This behavior can be traced back to the enhancement
capabilities of the trilinear Higgs self-interactions -- a trademark feature of
the 2HDM, with no counterpart in the Minimal Supersymmetric Standard Model.
Interestingly enough, the quantum effects are positive for energies around 500
GeV, thereby producing a significant enhancement in the expected number of
events precisely around the fiducial startup energy of the ILC. The Higgs-pair
production rates can be substantial, typically amounting to a few thousand
events per 500 inverse femtobarn of integrated luminosity. In contrast, the
corrections are negative in the highest energy range (1 TeV). We also compare
the exclusive pairwise production of Higgs bosons with the inclusive gauge
boson fusion channels leading to 2H+X finals states, and also with the
exclusive triple Higgs boson production. We find that these multiparticle final
states can be highly complementary in the overall Higgs bosons search strategy.Comment: 42 pages, 23 figures, 10 tables. Accepted in Phys. Rev. D (the
published version is shorter
The Flavor-locked Flavorful Two Higgs Doublet Model
We propose a new framework to generate the Standard Model (SM) quark flavor
hierarchies in the context of two Higgs doublet models (2HDM). The `flavorful'
2HDM couples the SM-like Higgs doublet exclusively to the third quark
generation, while the first two generations couple exclusively to an additional
source of electroweak symmetry breaking, potentially generating striking
collider signatures. We synthesize the flavorful 2HDM with the `flavor-locking'
mechanism, that dynamically generates large quark mass hierarchies through a
flavor-blind portal to distinct flavon and hierarchon sectors: Dynamical
alignment of the flavons allows a unique hierarchon to control the respective
quark masses. We further develop the theoretical construction of this
mechanism, and show that in the context of a flavorful 2HDM-type setup, it can
automatically achieve realistic flavor structures: The CKM matrix is
automatically hierarchical with and generically of the
observed size. Exotic contributions to meson oscillation observables may also
be generated, that may accommodate current data mildly better than the SM
itself.Comment: 34 pages, 2 tables, 2 figure
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