1,435 research outputs found
Low-scale gaugino mediation, lots of leptons at the LHC
Low-scale gaugino mediation predicts that gauginos are significantly heavier
than scalar superpartners. In order of increasing mass the lightest
superpartners are the gravitino, right-handed sleptons and left-handed sleptons
(no light neutralino!). This implies that squark decay chains pass through one
or more sleptons and typical final states from squark and gluino production at
the LHC include multiple leptons. In addition, left-handed staus have large
branching fractions into right-handed staus and the Higgs. As an example, we
compute the spectrum of low-scale deconstructed gaugino mediation. In this
model gauginos acquire masses at tree level at 5 TeV while scalar masses are
generated radiatively from the gaugino masses
Exact Results and Duality for SP(2N) SUSY Gauge Theories with an Antisymmetric Tensor
We study supersymmetric Sp(2N) gauge theories with matter in the
antisymmetric tensor representation and F fundamentals. For F=6 we solve the
theory exactly in terms of confined degrees of freedom and a superpotential. By
adding mass terms we obtain the theories with F<6 which we find to exhibit a
host of interesting non-perturbative phenomena: quantum deformed moduli spaces
with N constraints, instanton-induced superpotentials and non-equivalent
disjoint branches of moduli spaces. We find a simple dual for F=8 and no
superpotential. We show how the F=4 and F=2 theories can be modified to break
supersymmetry spontaneously and point out that the Sp(6) theory with F=6 may be
very interesting for model builders.Comment: 15 pages, LaTe
A Systematic Approach to Confinement in N=1 Supersymmetric Gauge Theories
We give necessary criteria for N=1 supersymmetric theories to be in a
smoothly confining phase without chiral symmetry breaking and with a
dynamically generated superpotential. Using our general arguments we find all
such confining SU and Sp theories with a single gauge group and no tree level
superpotential.Comment: 8 pages, LaTe
Differentiation, Quantification and Identification of Abrin and Abrus precatorius Agglutinin
Abrin, the toxic lectin from the rosary pea plant Abrus precatorius, has gained considerable interest in the recent past due to its potential malevolent use. However, reliable and easy-to-use assays for the detection and discrimination of abrin from related plant proteins such as Abrus precatorius agglutinin or the homologous toxin ricin from Ricinus communis are sparse. To address this gap, a panel of highly specific monoclonal antibodies was generated against abrin and the related Abrus precatorius agglutinin. These antibodies were used to establish two sandwich ELISAs to preferentially detect abrin or A. precatorius agglutinin (limit of detection 22 pg/mL for abrin; 35 pg/mL for A. precatorius agglutinin). Furthermore, an abrin-specific lateral flow assay was developed for rapid on-site detection (limit of detection ~1 ng/mL abrin). Assays were validated for complex food, environmental and clinical matrices illustrating broad applicability in different threat scenarios. Additionally, the antibodies turned out to be suitable for immuno-enrichment strategies in combination with mass spectrometry-based approaches for unambiguous identification. Finally, we were able to demonstrate for the first time how the developed assays can be applied to detect, identify and quantify abrin from a clinical sample derived from an attempted suicide case involving A. precatorius.Peer Reviewe
Minimal Gaugino Mediation
We propose Minimal Gaugino Mediation as the simplest known solution to the
supersymmetric flavor and CP problems. The framework predicts a very minimal
structure for the soft parameters at ultra-high energies: gaugino masses are
unified and non-vanishing whereas all other soft supersymmetry breaking
parameters vanish. We show that this boundary condition naturally arises from a
small extra dimension and present a complete model which includes a new
extra-dimensional solution to the mu problem. We briefly discuss the predicted
superpartner spectrum as a function of the two parameters of the model. The
commonly ignored renormalization group evolution above the GUT scale is crucial
to the viability of Minimal Gaugino Mediation but does not introduce new model
dependence.Comment: LaTeX, 16 pages, 4 figures, running of the bottom and tau Yukawas
included, plots revise
Higgs as a Holographic Pseudo-Goldstone Boson
The AdS/CFT correspondence allows to relate 4D strongly coupled theories to
weakly coupled theories in 5D AdS. We use this correspondence to study a
scenario in which the Higgs appears as a composite pseudo-Goldstone boson (PGB)
of a strongly coupled theory. We show how a non-linearly realized global
symmetry protects the Higgs mass and guarantees the absence of quadratic
divergences at any loop order. The gauge and Yukawa interactions for the PGB
Higgs are introduced in a simply way in the 5D AdS theory, and their one-loop
contributions to the Higgs potential are calculated using perturbation theory.
These contributions are finite, giving a squared-mass to the Higgs which is
one-loop smaller than the mass of the first Kaluza-Klein state. We also show
that if the symmetry breaking is caused by boundary conditions in the extra
dimension, the PGB Higgs corresponds to the fifth component of the bulk gauge
boson. To make the model fully realistic, a tree-level Higgs quartic coupling
must be induced. We present a possible mechanism to generate it and discuss the
conditions under which an unwanted large Higgs mass term is avoided.Comment: 31 pages, 6 figure
The Superpartner Spectrum of Gaugino Mediation
We compute the superpartner masses in a class of models with gaugino
mediation (or no-scale) boundary conditions at a scale between the GUT and
Planck scales. These models are compelling because they are simple, solve the
supersymmetric flavor and CP problems, satisfy all constraints from colliders
and cosmology, and predict the superpartner masses in terms of very few
parameters. Our analysis includes the renormalization group evolution of the
soft-breaking terms above the GUT scale. We show that the running above the GUT
scale is largely model independent and find that a phenomenologically viable
spectrum is obtained.Comment: 15 page
The Simplest Little Higgs
We show that the SU(3) little Higgs model has a region of parameter space in
which electroweak symmetry breaking is natural and in which corrections to
precision electroweak observables are sufficiently small. The model is anomaly
free, generates a Higgs mass near 150 GeV, and predicts new gauge bosons and
fermions at 1 TeV.Comment: 13 pages + appendix, typos corrected, version to appear in JHE
Evaluation of a Hydrogel-Based Diagnostic Approach for the Point-of-Care Based Detection of Neisseria gonorrhoeae
Eleven primer pairs were developed for the identification of Neisseria gonorrhoeae. The sensitivity and specificity of these primers were evaluated by Real Time (RT)-PCR melt curve analyses with DNA from 145 N. gonorrhoeae isolates and 40 other Neisseria or non-Neisseria species. Three primer pairs were further evaluated in a hydrogel-based RT-PCR detection platform, using DNA extracted from 50 N. gonorrhoeae cultures. We observed 100% sensitivity and specificity in the hydrogel assay, confirming its potential as a point-of-care test (POCT) for N. gonorrhoeae diagnosis
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