2,616 research outputs found
From quantum affine groups to the exact dynamical correlation function of the Heisenberg model
The exact form factors of the Heisenberg models and have been
recently computed through the quantum affine symmetry of model in the
thermodynamic limit. We use them to derive an exact formula for the
contribution of two spinons to the dynamical correlation function of
model at zero temperature.Comment: 5 pages, Latex, Presented at the Symposium ``Exactly soluble models
in statistical mechanics: historical perspectives and current status" March
30-31, 1996, Northeastern University, Bosto
Extracting W Boson Couplings from the Production of Four Leptons
We consider the processes , including all possible charged lepton combinations, with
regard to measuring parameters characterizing the boson. We calculate at
what level these processes can be used to measure anamolous triple-boson
vertice coupling parameters for the cases of colliders at 500
and 1 center of mass energies.Comment: 13 pages,OCIP/C-93-
Identifying Professional Development Opportunities for Remote Healthcare Interpreters on a Shared Network
Many healthcare organizations are faced with the challenge of complying with an unfunded mandate to provide language services free of charge to individuals with limited English proficiency or those who are deaf or hard of hearing. One method of increasing efficiencies and reducing disparities for these vulnerable populations is to provide access to remote audio/video interpreters on a shared network. The Health Care Interpreter Network (HCIN) is a non-profit organization based in California that comprises more than forty member hospitals and offers service in twenty languages. To support the need for on-going professional development of HCIN’s interpreters, a front-end analysis was conducted to identify areas of strength and opportunity. This paper explores the findings of this analysis, as well as recommendations made to HCIN stakeholders to improve access to professional development and strategies to address non-training related issues across the network
Spin-Correlation Coefficients and Phase-Shift Analysis for p+He Elastic Scattering
Angular Distributions for the target spin-dependent observables A,
A, and A have been measured using polarized proton beams at
several energies between 2 and 6 MeV and a spin-exchange optical pumping
polarized He target. These measurements have been included in a global
phase-shift analysis following that of George and Knutson, who reported two
best-fit phase-shift solutions to the previous global p+He elastic
scattering database below 12 MeV. These new measurements, along with
measurements of cross-section and beam-analyzing power made over a similar
energy range by Fisher \textit{et al.}, allowed a single, unique solution to be
obtained. The new measurements and phase-shifts are compared with theoretical
calculations using realistic nucleon-nucleon potential models.Comment: Submitted to Phys. Rev.
Attenuation of photosynthetically active radiation and ultraviolet light in response to changing dissolved organic carbon in browning lakes : modelling and parametrization
We present and evaluate an update to the process-based lake model MyLake that includes a time-varying linkage between light attenuation of both photosynthetically active radiation (PAR) and ultraviolet (UV) radiation wavelengths to changes in dissolved organic carbon (DOC). In many parts of northeastern North America and Europe, DOC in lakes has rapidly increased, leading to reduced water transparency and increases in light attenuation. These changes alter the vertical light and heat distribution that affect vertical structuring of temperature and dissolved oxygen. We use this model update to test the responsiveness of PAR and UV attenuation to short-term fluctuations in DOC and with a test case of long-term browning at Lake Giles (Pennsylvania). Lake Giles has browned significantly since the late 1980s, and three decades of detailed empirical data have indicated more than a doubling of DOC concentrations, and consequent increases in PAR and UV attenuation, warming surface waters, cooling deep waters, and increasing deepwater oxygen depletion. We found that the model performance improved by 16% and 52% for long-term trends in PAR and UV attenuation, respectively, when these coefficients respond directly to in-lake DOC concentrations. Further, long-term trends in surface water warming, deepwater cooling, and deepwater oxygen depletion in Lake Giles were better captured by the model following this update, and were very rapid due to its high water transparency and low DOC. Hence, incorporating a responsive link between DOC and light attenuation in lake models is key to understanding long-term lake browning patterns, mechanisms, and ecological consequences
The Measurement of Tri-Linear Gauge Boson Couplings at Colliders
We describe a detailed study of the process and the measurement of tri-linear gauge boson couplings (TGV's) at
LEP200 and at a 500~GeV and 1~TeV NLC. We included all tree level Feynman
diagrams contributing to the four-fermion final states including gauge boson
widths and non-resonance contributions. We employed a maximum likelihood
analysis of a five dimensional differential cross section of angular
distributions. This approach appears to offer an optimal strategy for
measurement of TGV's. LEP200 will improve existing measurements of TGV's but
not enough to see loop contributions of new physics. Measurements at the NLC
will be roughly 2 orders of magnitude more precise which would probe the
effects of new physics at the loop level.Comment: Latex file uses aipbook.sty with revtex and psfig.sty. 2 figures
(uuencoded) will be added with figures command. Full postcript version with
embedded figures is available at
ftp://ftp.physics.carleton.ca/pub/theory/godfrey/ocipc9504.ps To appear in
the Proceedings of the International Symposium on Vector Boson
Self-Interactions, UCLA, Feb. 1-3, 199
Decay in the Left-Right Supersymmetric Model
We calculate the rate of the decay and the electric dipole
moment of the electron in the left-right supersymmetric model when the breaking
of parity occurs at a considerably large scale. The low-energy flavor violation
in the model originates either from the nonvanishing remnants of the left-right
symmetry in the slepton mass matrix or from the direct flavor changing
lepton-slepton-neutralino interaction. The result is found to be large for the
masses of the supersymmetric particles not far from the electroweak scale and
already accessible at the current experimental accuracy. It also provides
nontrivial constraints of the lepton mixing in the model.Comment: 10 pages, LaTeX, 1 figur
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