Parton Distributions Functions of Pion, Kaon and Eta pseudoscalar mesons in the NJL model

Parton distributions of pseudoscalar pi,K and eta mesons obtained within the NJL model using the Pauli-Villars regularization method are analyzed in terms of LO and NLO evolution, and the valence sea quark and gluon parton distributions for the pion are obtained at Q^2 = 4 GeV^2 and compared to existing parametrizations at that scale. Surprisingly, the NLO order effects turn out to be small compared to the LO ones. The valence distributions are in good agreement with experimental analyses, but the gluon and sea distributions come out to be softer in the high-x region and harder in the low-x region than the experimental analyses suggest.Comment: (Latex, epsfig) 17 pages, 7 figure

The Mobility Case for Regionalism

In the discourse of local government law, the idea that a mobile populace can “vote with its feet” has long served as a justification for devolution and decentralization. Tracing to Charles Tiebout’s seminal work in public finance, the legal-structural prescription that follows is that a diversity of independent and empowered local governments can best satisfy the varied preferences of residents metaphorically shopping for bundles of public services, regulatory environment, and tax burden. This localist paradigm generally presumes that fragmented governments are competing for residents within a given metropolitan area. Contemporary patterns of mobility, however, call into question this foundational assumption. People today move between — and not just within — metropolitan regions, domestically and even internationally. This is particularly so for a subset of residents — high human-capital knowledge workers and the so-called “creative class” — that is prominently coveted in this interregional competition. These modern mobile residents tend to evaluate the policy bundles that drive their locational decisions on a regional scale, weighing the comparative merits of metropolitan areas against each other. And local governments are increasingly recognizing that they need to work together at a regional scale to compete for these residents.This Article argues that this intermetropolitan mobility provides a novel justification for regionalism that counterbalances the strong localist tendency of the traditional Tieboutian view of local governance. Contrary to the predominant assumption in the legal literature, competition for mobile residents is as much an argument for regionalism as it has been for devolution and decentralization. In an era of global cities vying for talent, the mobility case for regionalism has significant doctrinal consequences for debates in local government law and public finance, including the scope of local authority, the nature of regional equity, and the structure of metropolitan collaboration

Analysis of the Low-Energy Theorem for \gamma p \to p \pi^0

The derivation of the `classical' low-energy theorem (LET) for \gamma p \rightarrow p\pi^0 is re-examined and compared to chiral perturbation theory. Both results are correct and are not contradictory; they differ because different expansions of the same quantity are involved. Possible modifications of the extended partially conserved axial-vector current relation, one of the starting points in the derivation of the LET, are discussed. An alternate, more transparent form of the LET is presented.Comment: 5 pages, Revtex, no figures, no table

Richness and Abundance of Carabidae and Staphylinidae (Coleoptera), in Northeastern Dairy Pastures Under Intensive Grazing

Dairy cattle has become popular to dairy farmers in the Northeast looking for management schemes to cut production costs. Carabidae (ground beetles) and Staphylinidae (rove beetles) are indicators of habitat disturbances, such as drainage of wetlands, or grassland for grazing animals, and their monitoring could provide one measure of ecosystem sustainability if intensive management systems expand or intensify in the future. Our objective was assess the abundance and species richness of these two beetle families under intensive grazing throughout Pennsylvania, southern New York and Vermont. We collected 4365 ground beetles (83 species) and 4,027 rove beetles (79 species) by pitfall traps in three years in Pennsylvania. Nine ground beetle species, Amara aenea, Poecilus chalcites, Pterostichus melanarius, Bembidion quadrimaculatum oppositum, Amara familiaris, Poecilus lucublandus, Agonum muelleri, Bembidion obtusum and Bembidion mimus represented 80% of the Carabidae collected. Five other species were new to Pennsylvania. Four rove beetle species, Philonthus cognatus, Meronera venustula, Amischa analis, and Philonthus various = (carbonarius), comprised 74% of the total Staphylinidae collected. Yearly distributions of the dominant species did not change significantly in the three years with A. aenea and P. cognatus being most abundant every year. A parasitic rove beetle, Aleochara tristis, was recovered for the first time in Pennsylvania and Vermont since its release in the 1960\u27s to control face fly, Musca autumnalis. Similar results were found in New York and Vermont. We collected 1,984 ground beetles (68 species). Pterostichus melanarius was most abundant. Pterostichus vernalis was detected for the first time in the United States (Vermont). It was previously reported from Montreal, Canada. We collected 843 rove beetles (45 species). Philonthus cognatus was the most abundant rove beetle. In addition, Tachinus corticinus, previously known only from Canada, was discovered for the first time in the United States in Vermont. Pastures in Pennsylvania were diverse, containing 14 species of forage plants and 17 weed species. Botanical composition was similar in New York and Vermont. Sixteen species of grasses and legumes made up 90% of the plant composition and 36 species of weeds made up the remainder. This di­verse plant ecosystem may explain the richness of ground and rove beetles in northeastern U.S. pastures because the heterogeneity in the plant population provided additional resources which can support a rich assemblage of beetles. Monitoring richness and abundance of Carabidae and Staphylinidae over three years in Pennsylvania suggests intensive grazing systems are eco­logically sustainable