Inclusive Jet Cross Sections in pˉp\bar{p}p Collisions at s\sqrt{s}= 630 and 1800 GeV

We have made a precise measurement of the inclusive jet cross section at $\sqrt{s}$=1800 GeV. The result is based on an integrated luminosity of 92 pb^{-1} collected at the Fermilab Tevatron $\bar{p}p$ Collider with the D\O detector. The measurement is reported as a function of jet transverse energy (60 GeV <= E_{T} < 550 GeV), and in the pseudorapidity intervals |\eta| <= 0.5 and 0.1 <= |\eta| <= 0.7. A preliminary measurement of the pseudorapidity dependence of inclusive jet production (|\eta| <= 1.5) is also discussed. The results are in good agreement with predictions from next-to-leading order (NLO) quantum chromodynamics (QCD). D\O has also determined the ratio of jet cross sections at $\sqrt{s}$=630 GeV and $\sqrt{s}$=1800 GeV (|\eta| <= 0.5). This preliminary measurement differs from NLO QCD predictions.Comment: Submitted to the International Europhysics Conference on High Energy Physics, EPS-HEP99, 15-21 July, 1999, Tampere, Finlan

Looking Closely at Quality Circles: Implications for Intervention

This article explores quality circles (QCs), a popular type of work group employed extensively in business and industry. It is noted that several empirical studies point out the failure of QCs to achieve desired outcomes. On the basis of the findings of a study involving QCs in an electronics manufacturing firm, three categories of QCs are identified: management dominated QCs; stable QCs; and QCs in crisis. The article suggests that practitioners should recognize the complexity of QCs and focus intervention efforts upon individual, QC group, and organizational levels of analysis

Landscapes of Recovery: Belonging and Place in Post-Katrina Literatures

In Landscapes of Recovery: Belonging and Place in Post-Katrina Literatures, I analyze narratives of physical and social change following the events of Hurricane Katrina while providing a critical reading of the representations of New Orleans’s and the Gulf Coast’s urban landscapes in works of urban planning, nonfiction literature, and activist writing. A general line of inquiry informs this project: how do narratives about the disaster landscape following Katrina make visible or invisible certain political subjects? I assert that, by telling stories about the post- and pre-disaster landscape and its urban development history, these narratives carry out the process of displacement. Through a discursive analysis and close reading of a range of texts, including recovery plans, government reports, creative nonfiction, and public art projects, I explore how the writings about New Orleans’s disaster landscapes maintain and remake social differences within the urban population that make displacement possible. Overall, in Landscapes of Recovery, I argue that it is through these narratives about the urban space affected by disaster that notions of property, community, and belonging are contested

Jet measurements at DO using a KT algorithm

DO has implemented and calibrated a KT jet algorithm for the first time in a ppbar collider. We present two results based on 1992-1996 data which were recently published: the subjet multiplicity in quark and gluon jets and the central inclusive jet cross section. The measured ratio between subjet multiplicities in gluon and quark jets is consistent with theoretical predictions and previous experimental values. NLO pQCD predictions of the KT inclusive jet cross section agree with the DO measurement, although marginally in the low pT range. We also present a preliminary measurement of thrust cross sections, which indicates the need to include higher than alpha_s^3 terms and resumation in the theoretical calculations.Comment: 8 pages, 10 figures, presented at the High-Energy Physics International Conference in Quantum Chromodynamics, Montpellier, France, July 2-9th 2002. To be published in Nuclear Physics

Higher Order Containers

Abstract. Containers are a semantic way to talk about strictly positive types. In previous work it was shown that containers are closed under various constructions including products, coproducts, initial algebras and terminal coalgebras. In the present paper we show that, surprisingly, the category of containers is cartesian closed, giving rise to a full cartesian closed subcategory of endofunctors. The result has interesting applications syntax. We also show that while the category of containers has finite limits, it is not locally cartesian closed.

Tectonically controlled origin of three unusual rock suites in the Woodlark Basin

We propose alternative mechanisms for the origin of three unusual rock suites, high-Mg andesites, NaTi basalts, and arclike rocks, that have been dredged from the Woodlark basin, southwest Pacific Ocean. We show that the high-Mg andesites and NaTi basalts are associated with an unusually cool ridge environment. The cooling is due to increased hydrothermal circulation, stimulated by an unusually high crustal permeability. The high permeability is mainly due to cracking of the Woodlark basin lithosphere as it passes over the flexural bulge in front of the subduction zone, although local processes, such as faulting in fracture zones, may also make some contribution. This increased convective cooling affects magma dynamics and chemistry at the ridge crest. The high-Mg andesites occur where the hydrothermal circulation lowers the temperatures in the upper oceanic crust, causing the magma chamber to sit in the mantle rather than in the crust and promoting the interaction of basalt magma with harzburgite. The NaTi basalts are also the indirect result of increased crustal cooling, which causes anomalously low degrees of partial melting of their depleted mantle source. The arclike rocks are caused by interaction with volatiles from lithosphere that was emplaced beneath the edge of the basin less than 6 m.y. ago by a now inactive subduction zone to the north of the currently active one. Simple thermal models indicate that this formerly subducting plate is still cold enough to retain volatiles and to remain seismically active. As the old plate loses volatiles, they rise into the mantle convection cell which feeds the Woodlark basin ridge crest. Because ridge subduction increases the likelihood of ophiolite obduction, these observations and explanations of Woodlark basin tectonics are potentially important for ophiolites

An Intervention Model For Homeless Youth

Youth homelessness has become a more visible problem in recent years, and is exacerbated by changes in the central city economy, schooling, and the family. This article describes the Street Youth Employment Program, a program designed by sociological practitioners to intervene into the lives of homeless street youth through a collaborative effort between a socio-medical clink and an urban university. Program elements included (1) Stabilizing the living conditions of homeless youth, (2) Providing immediate part-time employment for participants on subsidized work projects, (3) Ensuring participation by youth in program policy and operation, and (4) Providing education and on-the-job training for youth. Of the youth who participated in the program (N = 16), the majority (70%) successfully moved away from living on the street to more stable involvement in work or school. The limited success of the intervention was attributed primarily to the linkage of meaningful employment with stable living arrangements, and attention to medical and mental health needs. It was noted that direct job creation is a more appropriate intervention strategy for homeless youth man pre-employment and job readiness services alone

T-Duality of Green-Schwarz Superstrings on AdS(d) x S(d) x M(10-2d)

We verify the self-duality of Green-Schwarz supercoset sigma models on AdS$_d \times S^d$ backgrounds (d=2,3,5) under combined bosonic and fermionic T-dualities without gauge fixing kappa symmetry. We also prove this property for superstrings on AdS$_d \times S^d \times S^d$ (d=2,3) described by supercoset sigma models with the isometries governed by the exceptional Lie supergroups $D(2,1;\alpha)$ (d=2) and $D(2,1;\alpha)\times D(2,1;\alpha)$ (d=3), which requires an additional T-dualisation along one of the spheres. Then, by taking into account the contribution of non-supercoset fermionic modes (up to the second order), we provide evidence for the T-self-duality of the complete type IIA and IIB Green-Schwarz superstring theory on AdS$_d\times S^d \times T^{10-2d}$ (d=2,3) backgrounds with Ramond-Ramond fluxes. Finally, applying the Buscher-like rules to T-dualising supergravity fields, we prove the T-self-duality of the whole class of the AdS$_d\times S^d \times M^{10-2d}$ superbackgrounds with Ramond-Ramond fluxes in the context of supergravity.Comment: v2: 57 pages, 1 figure, typos fixed and clarifications added, version to appear in JHE

New Strong Interactons at the Tevatron ?

Recent results from CDF indicate that the inclusive cross section for jets with $E_T > 200$ GeV is significantly higher than that predicted by QCD. We describe here a simple flavor-universal variant of the ``coloron" model of Hill and Parke that can accommodate such a jet excess, and which is not in contradiction with other experimental data. As such, the model serves as a useful baseline with which to compare both the data and other models proposed to describe the jet excess. An interesting theoretical feature of the model is that if the global chiral symmetries of the quarks remain unbroken in the confining phase of the coloron interaction, it realizes the possibility that the ordinary quarks are composite particles.Comment: added $1/Lambda^4$ contributions to scattering cross-sections; 10 pages, LaTeX, includes 1 figure. Full postscript version at http://smyrd.bu.edu/htfigs/htfigs.htm

QCD at high energy (experiments)

Recent measurements of QCD interactions involving large momentum transfers are reviewed. The status of measurements of the strong coupling constant is summarised. Recent developments in the measurement and interpretation of deep inelastic scattering, proton-anti-proton collisions and two-photon processes are discussed. While QCD at next-to-leading order gives a qualitative description of many processes, next-to-NLO calculations are now required to allow quantitative information to be extracted from hadron-initiated multijet data. This is illustrated by a discussion of recent data on the photoproduction of dijet events at HERA.Comment: Talk presented at the $31^{\rm st}$ International Conference on High Energy Physics, Amsterdam, 24-31 July 2002. 18 pages, 30 figure