3,019 research outputs found

    The Practitioner as the Essential Partner in Education and Research

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    Heavy flavor in heavy-ion collisions at RHIC and RHIC II

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    In the initial years of operation, experiments at the Relativistic Heavy Ion Collider (RHIC) have identified a new form of matter formed in nuclei-nuclei collisions at energy densities more than 100 times that of a cold atomic nucleus. Measurements and comparison with relativistic hydrodynamic models indicate that the matter thermalizes in an unexpectedly short time, has an energy density at least 15 times larger than needed for color deconfinement, has a temperature about twice the critical temperature predicted by lattice QCD, and appears to exhibit collective motion with ideal hydrodynamic properties - a "perfect liquid" that appears to flow with a near-zero viscosity to entropy ratio - lower than any previously observed fluid and perhaps close to a universal lower bound. However, a fundamental understanding of the medium seen in heavy-ion collisions at RHIC does not yet exist. The most important scientific challenge for the field in the next decade is the quantitative exploration of the new state of nuclear matter. That will require new data that will, in turn, require enhanced capabilities of the RHIC detectors and accelerator. In this report we discuss the scientific opportunities for an upgraded RHIC facility - RHIC II - in conjunction with improved capabilities of the two large RHIC detectors, PHENIX and STAR. We focus solely on heavy flavor probes. Their production rates are calculable using the well-established techniques of perturbative QCD and their sizable interactions with the hot QCD medium provide unique and sensitive measurements of its crucial properties making them one of the key diagnostic tools available to us.Comment: 96 pages, 53 figures. Accepted for publication in Physics Reports. Fixed typo in Fig. 15 captio

    Improving the J/psi Production Baseline at RHIC and the LHC

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    We assess the theoretical uncertainties on the inclusive J/psi production cross section in the Color Evaporation Model (CEM) using values for the charm quark mass, renormalization and factorization scales obtained from a fit to the charm production data. We use our new results to provide improved baseline comparison calculations at RHIC and the LHC. We also study cold matter effects on J/psi production at leading relative to next-to-leading order in the CEM within this approach.Comment: Proceedings for Hard Probes 2012, Cagliari, Ital

    Narrowing the uncertainty on the total charm cross section and its effect on the J/\psi\ cross section

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    We explore the available parameter space that gives reasonable fits to the total charm cross section to make a better estimate of its true uncertainty. We study the effect of the parameter choices on the energy dependence of the J/\psi\ cross section.Comment: 19 pages, 13 figure

    Oct. 25th

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    Simple Gifts

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    Zoo in the Garden: Book Review

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    Zoo in the Garden is part of the Lost and Found Wildlife Series and although available through Permanent Black in 2005, these stories were first published in the late nineteenth century. Edward Hamilton Aitken, affectionately known to his readership as EHA, was Indian born, but a thoroughly British subject. The son of a Scottish missionary, he was educated at the Bombay University, now known as Mumbai University. Aitken was a career public servant employed in the Customs and Salt Department of the Bombay Government, taking up posts in Khargoda and Karachi of the Bombay Presidency. Aitken delved into Natural History in his leisure time and like countless other Europeans, he was an amateur at a time when the disciplines of science where becoming institutionalised. Aitken was a founding member of the Natural History Society of Bombay in 1883 and his writings demonstrate this grey area between popular renditions of life lived through the lens of Natural History and the more formal aspects of Imperial science
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