67,132 research outputs found
The OPERA experiment
OPERA is a neutrino oscillation experiment designed to perform a nu\_tau
appearance search at long distance in the future CNGS beam from CERN to Gran
Sasso. It is based on the nuclear emulsion technique to distinguish among the
neutrino interaction products the track of a tau produced by a nu\_tau and its
decay tracks. The OPERA detector is presently under construction in the Gran
Sasso underground laboratory, 730 km from CERN, and will receive its first
neutrinos in 2006. The experimental technique is reviewed and the development
of the project described. Foreseen performances in measuring nu\_tau appearance
and also in searching for nu\_e appearance are discussed
Light hadrons in 2+1 flavor lattice QCD
This talk will focus on recent results by the MILC collaboration from
simulations of light hadrons in 2+1 flavor lattice QCD. We have achieved high
precision results in the pseudoscalar sector, including masses and decay
constants, plus quark masses and Gasser-Leutwyler parameters from well
controlled chiral perturbation theory fits to our data. We also show
spectroscopy results for vector mesons and baryons.Comment: To appear in the proceedings of the First Meeting of the APS Topical
Group on Hadronic Physics, Fermilab, Batavia, Illinois, Oct. 24-26, 200
Identified Particle Production in d+Au and p+p collisions at RHIC
The BRAHMS experiment at RHIC has measured the transverse momentum spectra of
charged pions, kaons and (anti-)protons over a wide range of rapidity in d+Au
and p+p collisions at GeV. The nuclear modification factor
at forward rapidities shows a clear suppression for . The
measured net-proton yields in p+p collisions are compared to PYTHIA and
HIJING/B and seem to be better described by the latter.Comment: 4 pages, 3 figures, presented at the 19th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions, "Quark Matter 2006", Shanghai,
China, November 14-20, 2006. to appear in the proceedings of Quark Matter
2006 as a special issue of Journal of Physics G: Nuclear and Particle Physic
The Incidence of Magnetic Fields in Massive Stars: An Overview of the MiMeS Survey Component
With only a handful of known magnetic massive stars, there is a troubling
deficit in the scope of our knowledge of the influence of magnetic fields on
stellar evolution, and almost no empirical basis for understanding how fields
modify mass loss and rotation in massive stars. Most remarkably, there is still
no solid consensus regarding the origin physics of these fields - whether they
are fossil remnants, or produced by contemporaneous dynamos, or some
combination of these mechanisms. This article will present an overview of the
Survey Component of the MiMeS Large Programs, the primary goal of which is to
search for Zeeman signatures in the circular polarimetry of massive stars
(stars with spectral types B3 and hotter) that were previously unknown to host
any magnetic field. To date, the MiMeS collaboration has collected more than
550 high-resolution spectropolarimetric observations with ESPaDOnS and Narval
of nearly 170 different stars, from which we have discovered 14 new magnetic
stars.Comment: 7 pages (+1 for questions), 3 figures, to appear in proceedings of
Stellar polarimetry: From birth to deat
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Bridging the digital divide for hard-to-reach groups
Boeltzig and Pilling identified specific groups of people who typically are not connected to the Internet and examined the circumstances of each - rural, poor, disabled, seniors, and ethnic minorities. They focused on how these groups of people, such as homebound individuals, could benefit most from using online government services. They also identified technical as well as social barriers that limit access. Their recommendations are aimed at both increasing access for these targeted groups and increasing use by individuals in the targeted groups. They also provide valuable recommendations aimed at service or application providers who have a major role in increasing both access and accessibility.
The case studies resulted in insights and lessons that are broadly applicable. Based on the case studies, the authors offer recommendations that are practical and serve as useful guides to practitioners and policy makers at all levels of government
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