11,842 research outputs found
Longitudinal Polarization at future Colliders and Virtual New Physics Effects
The theoretical merits of longitudinal polarization asymmetries of
electron-positron annihilation into two final fermions at future colliders are
examined, using a recently proposed theoretical description. A number of
interesting features, valid for searches of virtual effects of new physics, is
underlined, that is reminiscent of analogous properties valid on top of
resonance. As an application to a concrete example, we consider the case of a
model with triple anomalous gauge couplings and show that the additional
information provided by these asymmetries would lead to a drastic reduction of
the allowed domain of the relevant parameters.Comment: 18 pages and 1 figure. e-mail: [email protected]
Tree indiscernibilities, revisited
We give definitions that distinguish between two notions of indiscernibility
for a set \{a_\eta \mid \eta \in \W\} that saw original use in \cite{sh90},
which we name \textit{\s-} and \textit{\n-indiscernibility}. Using these
definitions and detailed proofs, we prove \s- and \n-modeling theorems and
give applications of these theorems. In particular, we verify a step in the
argument that TP is equivalent to TP or TP that has not seen
explication in the literature. In the Appendix, we exposit the proofs of
\citep[{App. 2.6, 2.7}]{sh90}, expanding on the details.Comment: submitte
Non-Singular Stationary Global Strings
A field-theoretical model for non-singular global cosmic strings is
presented. The model is a non-linear sigma model with a potential term for a
self-gravitating complex scalar field. Non-singular stationary solutions with
angular momentum and possibly linear momentum are obtained by assuming an
oscillatory dependence of the scalar field on t, phi and z. This dependence has
an effect similar to gauging the global U(1) symmetry of the model, which is
actually a Kaluza-Klein reduction from four to three spacetime dimensions. The
method of analysis can be regarded as an extension of the
gravito-electromagnetism formalism beyond the weak field limit. Some D=3
self-dual solutions are also discussed.Comment: 20 pages Latex, 12 PS figures included. Minor corrections. Version to
appear in Phys.Rev.
Antiferromagnetic critical pressure in URu2Si2 under hydrostatic conditions
The onset of antiferromagnetic order in URu2Si2 has been studied via neutron
diffraction in a helium pressure medium, which most closely approximates
hydrostatic conditions. The antiferromagnetic critical pressure is 0.80 GPa,
considerably higher than values previously reported. Complementary electrical
resistivity measurements imply that the hidden order-antiferromagnetic
bicritical point far exceeds 1.02 GPa. Moreover, the redefined
pressure-temperature phase diagram suggests that the superconducting and
antiferromagnetic phase boundaries actually meet at a common critical pressure
at zero temperature.Comment: 5 pgs, 4 figs; AFM ordered moment revised to 0.5 muB, added and
corrected citations and reference
MicroRNA-155 regulates monocyte chemokine and chemokine receptor expression in Rheumatoid Arthritis
Objectives: To test the hypothesis that miR-155 regulates monocyte migratory potential via modulation of chemokine and chemokine receptor expression in rheumatoid arthritis (RA); and thereby is associated with disease activity.
Methods: miR-155 copy-number in monocytes from peripheral blood (PB) of healthy
(n=22), RA (n=24), and RA synovial fluid (SF; n=11) were assessed by real time-
PCR using synthetic miR-155 as quantitative standard. To evaluate the functional
impact of miR-155, human monocytes were transfected with control or miR-155 mimic and the effect on transcript levels, and production of chemokines was evaluated by TLDA and multiplex assays. A comparative study evaluated constitutive
chemokine receptor expression in miR-155-/- and wild-type murine (CD115+Ly6C+Ly6G-) monocytes.
Results: Compared with healthy monocytes, miR-155 copy-number was higher in RA PB and SF monocytes (PB p<0.01, and SF p<0.0001). MiR-155 copy-number in RA PB monocytes were higher in ACPA positive compared with ACPA negative patients (p=0.033) and correlated (95% C.I.) with DAS28 (ESR), R=0.728 (0.460, 0.874), with tender, R=0.631 (0.306, 0.824) and swollen, R=0.503 (0.125, 0.753) joint counts. Enforced-expression of miR-155 in RA monocytes stimulated the production of CCL3, CCL4, CCL5, CCL8; up-regulated CCR7 expression and down-regulated CCR2. Conversely, miR155-/- monocytes showed down-regulated CCR7 and upregulated CCR2 expression.
Conclusions: Given the observed correlations with disease activity, these data provide strong evidence that miR-155 can contribute to RA pathogenesis by regulating chemokine production and pro-inflammatory chemokine receptor expression, thereby promoting inflammatory cell recruitment and retention in the RA synovium
Risk Behaviors of Dominican Adolescents in Their Homeland and in the United States
The purpose of this study was to compare self-reported high risk behaviors that may lead to unintentional and intentional injuries among adolescents living in the Dominican Republic and Dominican adolescents living in the United States
Long-term yogurt consumption and risk of incident hypertension in adults
The Nurses' Health Study and Health Professionals Follow-up Study cohorts are supported by grants UM1 CA186107, UM1 CA176726, and UM1 CA167552 from the National Institutes of Health. The current analyses were supported by small grants from the National Dairy Council, the General Mills Bell Institute for Health and Nutrition, and the Boston Nutrition and Obesity Research Center. The Boston Nutrition Obesity Research Center is administratively based at Boston Medical Center and is funded by the National Institutes of Health (NIH/NIDDK) grant P30DK046200. (UM1 CA186107 - National Institutes of Health; UM1 CA176726 - National Institutes of Health; UM1 CA167552 - National Institutes of Health; small grants from the National Dairy Council; General Mills Bell Institute for Health and Nutrition; Boston Nutrition and Obesity Research Center; P30DK046200 - National Institutes of Health (NIH/NIDDK))Accepted manuscrip
Antiferromagnetic Critical Fluctuations in BaFeAs
Magnetic correlations near the magneto-structural phase transition in the
bilayer iron pnictide parent compound, BaFeAs, are measured. In close
proximity to the antiferromagnetic phase transition in BaFeAs, a
crossover to three dimensional critical behavior is anticipated and has been
preliminarily observed. Here we report complementary measurements of
two-dimensional magnetic fluctuations over a broad temperature range about
T. The potential role of two-dimensional critical fluctuations in the
magnetic phase behavior of BaFeAs and their evolution near the
anticipated crossover to three dimensional critical behavior and long-range
order are discussed.Comment: 6 pages, 4 figures; Accepted for publication in Physical Review
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