800 research outputs found
Adapting Sequence Models for Sentence Correction
In a controlled experiment of sequence-to-sequence approaches for the task of
sentence correction, we find that character-based models are generally more
effective than word-based models and models that encode subword information via
convolutions, and that modeling the output data as a series of diffs improves
effectiveness over standard approaches. Our strongest sequence-to-sequence
model improves over our strongest phrase-based statistical machine translation
model, with access to the same data, by 6 M2 (0.5 GLEU) points. Additionally,
in the data environment of the standard CoNLL-2014 setup, we demonstrate that
modeling (and tuning against) diffs yields similar or better M2 scores with
simpler models and/or significantly less data than previous
sequence-to-sequence approaches.Comment: EMNLP 201
Treatment Foster Parents\u27 Perceptions of Their Role with the Primary Family of Foster Youth
This study provides a description of treatment foster parents\u27 perceptions of their role with the primary family of foster youth. This study also identifies a baseline measure of treatment foster parents\u27 perceptions which can be utilized for agency program planning, policy and administration. The study sample includes 98 treatment foster parents licensed by the state of North Dakota, and supervised by Professional Association of Treatment Homes (PATH). A mail survey explores different levels of involvement between the treatment foster family and the foster child\u27s primary family, whether or not treatment foster parents believe they can impact the primary families of foster youth, how they might impact the primary families of foster youth and what they consider to be important elements of a treatment foster care program.
Study findings with a 60% response rate, indicate that 90% of the treatment foster parents believe they can impact the foster youth and their primary families. Findings show that 57% of the respondents believe that the most effective ways they can impact the foster youth and their primary family are by role modeling or mentoring and 52% by having frequent, open communication. A total of 56% of the respondents believe the most important element of a treatment foster care program is the ability to individualize treatment plans. Only 5% of the respondents believe that treatment plans should be family-focused compared to 51% who believe that treatment plans should be child-focused. This is incongruent with other perceptions, which indicate at least moderate of foster parent involvement with the primary families of foster youth. This incongruency implies a need for agency program planning, policy and administration that reflects a family based service approach to treatment foster care to maximize reunification efforts
Deconstructing Gaugino Mediation
We present a model of supersymmetry breaking which produces gaugino masses
and negligible scalar masses at a high scale. The model is inspired by
``deconstructing'' or ``latticizing'' models in extra dimensions where
supersymmetry breaking and visible matter are spatially separated. We find a
simple four-dimensional model which only requires two lattice sites (or gauge
groups) to reproduce the phenomenology.Comment: LaTeX, 9 pages, acknowledgements adde
Collective Quartics and Dangerous Singlets in Little Higgs
Any extension of the standard model that aims to describe TeV-scale physics
without fine-tuning must have a radiatively-stable Higgs potential. In little
Higgs theories, radiative stability is achieved through so-called collective
symmetry breaking. In this letter, we focus on the necessary conditions for a
little Higgs to have a collective Higgs quartic coupling. In one-Higgs doublet
models, a collective quartic requires an electroweak triplet scalar. In
two-Higgs doublet models, a collective quartic requires a triplet or singlet
scalar. As a corollary of this study, we show that some little Higgs theories
have dangerous singlets, a pathology where collective symmetry breaking does
not suppress quadratically-divergent corrections to the Higgs mass.Comment: 4 pages; v2: clarified the existing literature; v3: version to appear
in JHE
The Little Hierarchy in Universal Extra Dimensions
In the standard model in universal extra dimensions (UED) the mass of the
Higgs field is driven to the cutoff of the higher-dimensional theory. This
re-introduces a small hierarchy since the compactification scale 1/R should not
be smaller than the weak scale. In this paper we study possible solutions to
this problem by considering five-dimensional theories where the Higgs field
potential vanishes at tree level due to a global symmetry. We consider two
avenues: a Little Higgs model and a Twin Higgs model. An obstacle for the
embedding of these four-dimensional models in five dimensions is that their
logarithmic sensitivity to the cutoff will result in linear divergences in the
higher dimensional theory. We show that, despite the increased cutoff
sensitivity of higher dimensional theories, it is possible to control the Higgs
mass in these two scenarios. For the Little Higgs model studied, the
phenomenology will be significantly different from the case of the standard
model in UED. This is due to the fact that the compactification scale
approximately coincides with the scale where the masses of the new states
appear. For the case of the Twin Higgs model, the compactification scale may be
considerably lower than the scale where the new states appear. If it is as low
as allowed by current limits, it would be possible to experimentally observe
the standard model Kaluza-Klein states as well as a new heavy quark. On the
other hand, if the compactification scale is higher, then the phenomenology at
colliders would coincide with the one for the standard model in UED.Comment: 25 pages, 2 figure
Little Higgs Model Completed with a Chiral Fermionic Sector
The implementation of the little Higgs mechanism to solve the hierarchy
problem provides an interesting guiding principle to build particle physics
models beyond the electroweak scale. Most model building works, however, pay
not much attention to the fermionic sector. Through a case example, we
illustrate how a complete and consistent fermionic sector of the TeV effective
field theory may actually be largely dictated by the gauge structure of the
model. The completed fermionic sector has specific flavor physics structure,
and many phenomenological constraints on the model can thus be obtained beyond
gauge, Higgs, and top physics. We take a first look on some of the quark sector
constraints.Comment: 14 revtex pages with no figure, largely a re-written version of
hep-ph/0307250 with elaboration on flavor sector FCNC constraints; accepted
for publication in Phys.Rev.
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