54 research outputs found
Supersymmetric QCD: Exact Results and Strong Coupling
We revisit two longstanding puzzles in supersymmetric gauge theories. The
first concerns the question of the holomorphy of the coupling, and related to
this the possible definition of an exact (NSVZ) beta function. The second
concerns instantons in pure gluodynamics, which appear to give sensible, exact
results for certain correlation functions, which nonetheless differ from those
obtained using systematic weak coupling expansions. For the first question, we
extend an earlier proposal of Arkani-Hamed and Murayama, showing that if their
regulated action is written suitably, the holomorphy of the couplings is
manifest, and it is easy to determine the renormalization scheme for which the
NSVZ formula holds. This scheme, however, is seen to be one of an infinite
class of schemes, each leading to an exact beta function; the NSVZ scheme,
while simple, is not selected by any compelling physical consideration. For the
second question, we explain why the instanton computation in the pure
supersymmetric gauge theory is not reliable, even at short distances. The
semiclassical expansion about the instanton is purely formal; if infrared
divergences appear, they spoil arguments based on holomorphy. We demonstrate
that infrared divergences do not occur in the perturbation expansion about the
instanton, but explain that there is no reason to think this captures all
contributions from the sector with unit topological charge. That one expects
additional contributions is illustrated by dilute gas corrections. These are
infrared divergent, and so difficult to define, but if non-zero give order one,
holomorphic, corrections to the leading result. Exploiting an earlier analysis
of Davies et al, we demonstrate that in the theory compactified on a circle of
radius beta, due to infrared effects, finite contributions indeed arise which
are not visible in the formal limit that beta goes to infinity.Comment: 28 pages, two references added, one typo correcte
Nurse staffing, direct nursing care hours and patient mortality in Taiwan: the longitudinal analysis of hospital nurse staffing and patient outcome study
<p>Abstract</p> <p>Background</p> <p>Studies over the past decades have shown an association between nurse staffing and patient outcomes, however, most of these studies were conducted in the West. Accordingly, the purpose of this study aimed to provide an overview of the research/evidence base which has clarified the relationship between nurse staffing and patient mortality of acute care hospital wards under a universal health insurance system and attempted to provide explanations for some of the phenomena that are unique in Taiwan.</p> <p>Methods</p> <p>Through stratified random sampling, a total of 108 wards selected from 32 hospitals in Taiwan were collected over a consecutive seven month period. The mixed effect logit model was used to explore the relationship between nurse staffing and patient mortality.</p> <p>Results</p> <p>The medians of direct-nursing-care-hour, and nurse manpower were 2.52 h, and 378 persons, respectively. The OR for death between the long direct-nursing-care-hour (> median) group and the short direct-nursing-care-hour (≦median) group was 0.393 (95% CI = [0.245, 0.617]). The OR for death between the high (> median) and the low (≦median) nurse manpower groups was 0.589 (95% CI = [0.381, 0.911]).</p> <p>Conclusions</p> <p>Findings from this study demonstrate an association of nurse staffing and patient mortality and are consistent with findings from similar studies. These findings have policy implications for strengthening the nursing profession, nurse staffing, and the hospital quality associated with nursing. Additional research is necessary to demonstrate adequate nurse staffing ratios of different wards in Taiwan.</p
Mach Cones in Quark Gluon Plasma
The experimental azimuthal dihadron distributions at RHIC show a double peak
structure in the away side ( rad.) for intermediate
particles. A variety of models have appeared trying to describe this
modification. We will review most of them, with special emphasis in the Conical
Flow scenario in which the observed shape is a consequence of the emission of
sound by a supersonic high momentum particle propagating in the Quark Gluon
Plasma.Comment: 8 pages, 3 figures, Invited plenary talk given at the 19th
International Conference on Ultrarelativistic Nucleus-Nucleus Collisions:
Quark Matter 2006 (QM 2006), Shanghai, China, 14-20 Nov 200
Odderon in baryon-baryon scattering from the AdS/CFT correspondence
Based on the AdS/CFT correspondence, we present a holographic description of
various C-odd exchanges in high energy baryon-baryon and baryon-antibaryon
scattering, and calculate their respective contributions to the difference in
the total cross sections. We predict that, due to the warp factor of AdS_5, the
total cross section in pp collisions is larger than in p\bar{p} collisions at
asymptotically high energies.Comment: 23 pages, v2: minor changes, to be published in JHE
Evidence-Based Health Services Management for Nurse Leaders: An Intracampus Partnership and Curriculum
ABSTRACT OBJECTIVE: In 2008, the New York University Graduate School of Public Service and NYU Libraries faculty partnered to offer a credit course to prepare nurse managers in a graduate program to use the evidence-based paradigm as a framework for locating and filtering best quality evidence to support decision making in the workplace. METHODS: Using lecture, demonstration, hands-on exercises, online tutorials, and readings, the students gained a theoretical basis for framing answerable research questions and exploiting the structure of bibliographic databases to retrieve evidence for management challenges such as medication administration, patient safety, reducing nursing turnover, among many research topics focused on healthcare quality, cost, and access. Critically appraising the literature in the context of the evidence pyramid is introduced along with sources for both free and fee-based data, statistics, and government information. RESULTS: Nurse managers gained competence in navigating, citing, and communicating; they demonstrated an understanding of the evidence hierarchy, assessing methodological quality, and the social and ethical issues related to the provision, dissemination, and sharing of information. CONCLUSIONS: Nurse leaders, in their critical role in contemporary healthcare organizations, have a pressing need to locate evidence-based research. Information literacy embedded in a framework of evidence empowers nurse managers with strategies to retrieve research to support decision making and practice changes in the workplace. A credit course dedicated to an evidence-based approach to the profusion of available information provides a foundation for lifelong professional competence in the use of health services management research
Identified hadron compositions in p+p and Au+Au collisions at high transverse momenta at GeV
We report transverse momentum ( GeV/) spectra of , , , ,
, and at mid-rapidity in p+p and Au+Au collisions at
= 200 GeV. Perturbative QCD calculations are consistent with
spectra in p+p collisions but do not reproduce and
spectra. The observed decreasing antiparticle-to-particle ratios with
increasing provide experimental evidence for varying quark and gluon jet
contributions to high- hadron yields. The relative hadron abundances in
Au+Au at GeV/ are measured to be similar to the p+p
results, despite the expected Casimir effect for parton energy loss.Comment: 6 pages, 3 figures, published at PR
Convex regions of stationary spacetimes and Randers spaces. Applications to lensing and asymptotic flatness
By using Stationary-to-Randers correspondence (SRC), a characterization of
light and time-convexity of the boundary of a region of a standard stationary
(n+1)-spacetime is obtained, in terms of the convexity of the boundary of a
domain in a Finsler n or (n+1)-space of Randers type. The latter convexity is
analyzed in depth and, as a consequence, the causal simplicity and the
existence of causal geodesics confined in the region and connecting a point to
a stationary line are characterized. Applications to asymptotically flat
spacetimes include the light-convexity of stationary hypersurfaces which
project in a spacelike section of an end onto a sphere of large radius, as well
as the characterization of their time-convexity with natural physical
interpretations. The lens effect of both light rays and freely falling massive
particles with a finite lifetime, (i.e. the multiplicity of such connecting
curves) is characterized in terms of the focalization of the geodesics in the
underlying Randers manifolds.Comment: AMSLaTex, 41 pages. v2 is a major revision: new discussions on
physical applicability of the results, especially to asymptotically flat
spacetimes; references adde
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