69,274 research outputs found
Limiting SUSY compressed spectra scenarios
Typical searches for supersymmetry cannot test models in which the two
lightest particles have a small ("compressed") mass splitting, due to the small
momentum of the particles produced in the decay of the second-to-lightest
particle. However, datasets with large missing transverse momentum () can generically search for invisible particle production and
therefore provide constraints on such models. We apply data from the ATLAS
mono-jet (jet+) and vector-boson-fusion (forward jets and
) searches to such models. The two datasets have
complementary sensitivity, but in all cases experimental limits are at least
five times weaker than theoretical predictions
Herbicide evaluation for the control of wild taro
Wild taro (Colocasia esculenta (L.) Schott), is an exotic, emergent
perennial that has established in many shallow-water
wetlands throughout the southern United States. Although
wild taro is a cultivated crop in many tropical and subtropical
areas of the world, its invasion in riverine and lacustrine wetlands
in the U.S. has resulted in the loss of habitat for native
plant species. Once established, wild taro forms dense, monotypic
stands that reduce the diversity of native vegetation, as
has occurred in Louisiana, Florida, and Texas (Akridge and
Fonteyn 1981, Simberloff et al. 1997). Akridge and Fonteyn
(1981) reported that although wild taro is considered naturalized
in south-central Texas, its present dominance along
the San Marcos River has altered the native vegetational
structure and dynamics of this river system. The
objective of this study was to evaluate the efficacy of four
aquatic herbicides for control of wild taro
Extracting Spooky-activation-at-a-distance from Considerations of Entanglement
Following an early claim by Nelson & McEvoy \cite{Nelson:McEvoy:2007}
suggesting that word associations can display `spooky action at a distance
behaviour', a serious investigation of the potentially quantum nature of such
associations is currently underway. This paper presents a simple quantum model
of a word association system. It is shown that a quantum model of word
entanglement can recover aspects of both the Spreading Activation equation and
the Spooky-activation-at-a-distance equation, both of which are used to model
the activation level of words in human memory.Comment: 13 pages, 2 figures; To appear in Proceedings of the Third Quantum
Interaction Symposium, Lecture Notes in Artificial Intelligence, vol 5494,
Springer, 200
Progress in Electroweak Baryogenesis
Recent work on generating the excess of matter over antimatter in the early
universe during the electroweak phase transition is reviewed.Comment: 50 pages (figures on request), uses harvmac (table of contents
correct for "l" format), UCSD-93-2,BU-HEP-93-
Plastic flow around rigid spherical inclusions
The extent of plastic flow in a spherical solid (assumed to be homogeneous and elastically and plastically isotropic), surrounding a concentric rigid sphere was calculated as a function of applied external pressure. The applied pressure necessary to cause plastic deformation throughout the solid was obtained
Narrowing the uncertainty on the total charm cross section and its effect on the J/\psi\ cross section
We explore the available parameter space that gives reasonable fits to the
total charm cross section to make a better estimate of its true uncertainty. We
study the effect of the parameter choices on the energy dependence of the
J/\psi\ cross section.Comment: 19 pages, 13 figure
Stress anisotropy and concentration effects in high pressure measurements
Sodium chloride is used as an internal pressure standard in high pressure research. Possible corrections are discussed which are needed in the calibration of this standard due to the independent effects of stress anisotropy and stress concentration in pressure vessels. The first is due to the lack of a truly hydrostatic state of stress in solid state pressure vessels. The second is due to the difference in the compressibilities between the pressure transmitting substances (sodium chloride) and a stiffer test specimen. These two corrections are then combined and a total correction, as a function of measured pressure, is discussed for two systems presently in use. The predicted value of the combined effect is about 5-10% of the pressure at 30 GPa
Patterned Geometries and Hydrodynamics at the Vortex Bose Glass Transition
Patterned irradiation of cuprate superconductors with columnar defects allows
a new generation of experiments which can probe the properties of vortex
liquids by confining them to controlled geometries. Here we show that an
analysis of such experiments that combines an inhomogeneous Bose glass scaling
theory with the hydrodynamic description of viscous flow of vortex liquids can
be used to infer the critical behavior near the Bose glass transition. The
shear viscosity is predicted to diverge as at the Bose glass
transition, with the dynamical critical exponent.Comment: 5 pages, 4 figure
Improving the J/psi Production Baseline at RHIC and the LHC
We assess the theoretical uncertainties on the inclusive J/psi production
cross section in the Color Evaporation Model (CEM) using values for the charm
quark mass, renormalization and factorization scales obtained from a fit to the
charm production data. We use our new results to provide improved baseline
comparison calculations at RHIC and the LHC. We also study cold matter effects
on J/psi production at leading relative to next-to-leading order in the CEM
within this approach.Comment: Proceedings for Hard Probes 2012, Cagliari, Ital
Development of reliability methodology for systems engineering. Volume II - Application - Design reliability analysis of a 250 volt-ampere static inverter Final report
Design stage reliability analysis application to static inverte
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