Applications of Nonrelativistic Effective Field Theories to quarkonium systems with a small radius

We review some predictions of nonrelativistic effective field theories for heavy quark-antiquark systems with a small typical radius, r<1/\Lambda_QCD.Comment: 4 pages, uses espcrc2.sty, talk given at the BEACH2002 Conference, Vancouver, June 200

Widely Tunable, Low Linewidth, and High Power Laser Source using an Electro-Optic Comb and Injection-Locked Slave Laser Array

We propose a simple approach to implement a tunable, high power and narrow linewidth laser source based on a series of highly coherent tones from an electro-optic frequency comb and a set of 3 DFB slave lasers. We experimentally demonstrate approximately 1.25 THz (10 nm) of tuning within the C-Band centered at 192.9 THz (1555 nm). The output power is approximately 100 mW (20 dBm), with a side band suppression ratio greater than 55 dB, and a linewidth below 400 Hz across the full range of tunability. This approach is scalable and may be extended to cover a significantly broader optical spectral range

Anti-Screening by Quarks and the Structure of the Inter-Quark Potential

The inter-quark potential is dominated by anti-screening effects which underly asymptotic freedom. We calculate the order g^6 anti-screening contribution from light fermions and demonstrate that these effects introduce a non-local divergence. These divergences are shown to make it impossible to define a coupling renormalisation scheme that renormalises this minimal, anti-screening potential. Hence the beta function cannot be divided into screening and anti-screening parts beyond lowest order. However, we then demonstrate that renormalisation can be carried out in terms of the anti-screening potential.Comment: 11 pages, some clarifications and typographical corrections, to appear in Physics Letters

A critical test of stellar evolution and convective core overshooting by means of zeta-Aur systems

No description supplie

Greenhouse and Field Evaluations of Entomopathogenic Nematodes (Nematode: Heterorhabditidae and Steinernematidae) for Control of Cabbage Maggot (Diopters: Anthomyiidae) on Cabbage

Entomb pathogenic nematodes-Heterorhabditis bacteriophora Poinar (Oswego strain), Steinenema carpocapsae (Weiser) (NY001 strain), Steinemema carpocapsae (25 strain), Steinemema feltiae Filipjev (=Neoaplectana carpocapsae Weiser) (369 strain), Steinernema feltiae (27 strain), and Steinernema riobravus Cabanillas and Poinar (355 strain)-were examined for pathogenicity against cabbage maggot, Delia radicum (L.), larvae in the greenhouse and field. Applications (per plant) of 3,000 and 4,000 infective juveniles of S. feltiae (369 strain), 30,000 infective juveniles of H. bacteriophora (Oswego strain), and 300 and 30,000 infective juveniles of S. feltiae (27 strain) reduced the number of D. radicum that developed to pupae on potted cabbage plants. H. bacteriophora (Oswego) at applications of 3,000 and 30,000 infective juveniles per plant and S. feltiae (27 strain) at applications of 30,000 (but not 3,000) infective juveniles per plant significantly reduced root damage caused by larvae of D. radicum. Logarithmically increased dosages between 100 and 100,000 infective juveniles per plant of S. feltiae (27 strain) linearly reduced the number of D. radicum pupae that developed on potted cabbage plants and the damage caused to the roots by D. radicullarvae. Root and stem dry weights of cabbage plants infested with D. radicum were significantly greater for plants inoculated with 100,000 infective juveniles of S. feltiae (27 strain) than for plants not inoculated with nematodes. Nematode inoculation did not prevent significant losses in root or stem dry weights at dosages less than 100,000 infective juveniles per plant. Soil surface applications of 100,000 and 200,000 infective juveniles per plant of S. feltiae (27 strain) were more effective than subsurface applications in preventing damage by natural or augmented populations of D. radicum larvae on cabbage in the field. However, mortality rates of wax moth larvae exposed to soil samples treated with S. feltiae (27 strain) suggested that this nematode showed greater persistence when applied beneath rather than on the soil surfac

Leptonic constant of pseudoscalar B_c meson

We calculate the leptonic constant for the ground pseudoscalar state of B_c meson in the framework of QCD-motivated potential model taking into account the two-loop anomalous dimension for the heavy quark current in the nonrelativistic QCD as matched with the full QCD.Comment: 6 pages, RevTeX4 file, 3 eps-figures, several references and remarks adde

On the pattern of Casimir scaling violation in gluodynamics

Results of lattice analysis indicate that the static potential in SU(3) gauge theory is proportional to eigenvalue of quadratic Casimir operator for the corresponding representation with a good accuracy. We discuss the mechanism of possible deviations from the Casimir scaling in gluodynamics in terms of correlators of path-ordered gauge-invariant operators defined on the worldsheet of the confining string.Comment: LaTeX, 12 pages, no figure

Fermionic contributions to the three-loop static potential

We consider the three-loop corrections to the static potential which are induced by a closed fermion loop. For the reduction of the occurring integrals a combination of the Gr\"obner and Laporta algorithm has been used and the evaluation of the master integrals has been performed with the help of the Mellin-Barnes technique. The fermionic three-loop corrections amount to 2% of the tree-level result for top quarks, 8% for bottom quarks and 27% for the charm quark system.Comment: 12 pages, 3 figures, to appear in Phys. Lett.

Macrofauna and biostratigraphy of the Rollrock Section, northern Ellesmere Island, Canadian Arctic Islands - a comprehensive high latitude archive of the Jurassic - Cretaceous Transition

Working in the Arctic would not be possible without manifold support. Our sincere thanks go to the following people in Canada who helped to make our research a success: Sylvie LeBlanc (Department of Culture and Heritage, Iglooik, Canada); Jane Chisholm (Parks Canada, Iqaluit, Canada); John Innis (Universal Helicopters); the rangers of Parks Canada at Quttinirpaaq National Park (Ellesmere Island, Canada); the Polar Continental Shelf Programme team at Resolute (Cornwallis Island, Canada); Margaret Currie, Laura Smyk and Kieran Sheperd (all Canadian Museum of Nature, Ottawa, Canada). Alex Chavanne (California, USA) joined our team as an excellent field assistant, helped logging and sampling the Rollrock Section and found the giant Dorsoplanites specimen. Sarah Wallace-Jones (Sedgwick Museum, Department of Earth Sciences, University of Cambridge, UK) provided access to preparation labs. Magdalena Biszczuk (CASP) prepared the maps in Fig. 1; and Michael Pointon (CASP) polished the English. Ashton F. Embry (Geological Survey of Canada, Calgary) kindly shared his field observations and analytical results on the Rollrock Section. Mikhail Rogov (Geologicheskij Institut, Rossijskaja Akademija Nauk, Moscow) greatly helped by sharing expert knowledge regarding ammonites of the Jurassic-Cretaceous boundary interval and by providing literature. CASP's industry sponsors are acknowledged for funding the Canadian Arctic Islands Project. Peter Alsen (Geological Survey of Denmark and Greenland, Copenhagen, Denmark) and Terence Poulton (Natural Resources Canada, Calgary, Canada) provided careful and detailed reviews, which greatly improved the manuscript.Peer reviewedPostprin

Long-Term Exposure of Sitka Spruce Seedlings to Trichloroacetic Acid

Trichloroacetic acid (TCA) has been implicated as an airborne pollutant responsible for adverse effects on forest health. There is considerable debate as to whether TCA observed in trees and forest soils is derived from atmospheric deposition or from in situ production. This experiment reports the results from treating 4-year-old Sitka spruce ( Picea sitchensis(Bong.) Carr) plants in a greenhouse over a growing season with TCA supplied either to the soil or to the foliage at concentrations of 10 and 100 ng mL-1. Similar uptake of TCA by needles was observed for both modes of treatment, with significant accumulation of TCA (300 ng g-1 dry wt) at the higher concentration. Larger concentrations in stem tissue were seen for the foliar-applied TCA (280 ng g-1) than for the soil-applied TCA (70 ng g-1), suggesting that direct stem uptake may be important. Six months after treatments stopped, TCA concentrations in the needles of plants exposed to 100 ng mL-1 TCA were still enhanced, showing that biological degradation of TCA in needles was slow over the winter. By contrast, no significant enhancement of TCA in soil could be detected in the directly treated soils even during the experiment. The protein content of needles treated with the higher concentration of TCA by either route was significantly smaller than for the controls, but there was no effect of TCA on the conjugation of 1-chloro-2,4-dinitrobenzene in roots nor on the conjugation of 1,2-dichloro-4-nitrobenzene in needles