2,213 research outputs found
High-pT hadron production and triggered particle correlations
The STAR experiment at the Relativistic Heavy-Ion Collider has performed
measurements of high transverse momentum particle production in
ultra-relativistic heavy-ion collisions. High-pT hadrons are generated from
hard parton scatterings early in the collision. The outgoing partons probe the
surrounded hot and dense matter through interactions. Recent results on high-pT
inclusive particle production and leading particle correlations in p+p, d+Au
and Au+Au collisions at sqrt(s_NN) = 200 GeV are reviewed.Comment: 4 pages, 4 figures. Invited talk at XLIst Rencontres de Moriond (QCD
and Hadronic interactions), La Thuile, Italy, March 18-25, 200
High transverse momentum inclusive neutral pion production in d+Au collisions at RHIC
Preliminary results are presented on high-pT inclusive neutral pion
production in d+Au collisions at sqrt(sNN) = 200 GeV in the pseudo-rapidity
range 0 gamma,gamma are detected in the
Barrel electromagnetic calorimeter of the STAR experiment at RHIC. The analysis
procedure is described in detail and the results are found to be in good
agreement with earlier STAR findings and with next-to-leading order
perturbative QCD calculations.Comment: 4 pages, 3 figures, poster proceedings of Quark Matter conference,
Budapest (Hungary), 4-9 August 200
Canonical aspects of strangeness enhancement
Strangeness enhancement (SE) in heavy ion collisions can be understood in the
statistical model on the basis of canonical suppression. In this formulation,SE
is a consequence of the transition from canonical to the asymptotic grand
canonical limit and is predicted to be a decreasing function of collision
energy. This model predictions are consistent with the recent NA49 data on
enhancement at GeV.Comment: 4 pages, 4 figures. To appear in the proceedings of Quark Matter 2002
(Nantes, France
Apparatus and method for suppressing sound in a gas turbine engine powerplant
A method and apparatus for suppressing jet noise in a gas turbine engine powerplant 10 is disclosed. Various construction details are developed for providing sound suppression at sea level take-off operative conditions and not providing sound suppression at cruise operative conditions. In one embodiment, the powerplant 10 has a lobed mixer 152 between a primary flowpath 44 and a second flowpath 46, a diffusion region downstream of the lobed mixer region (first mixing region 76), and a deployable ejector/mixer 176 in the diffusion region which forms a second mixing region 78 having a diffusion flowpath 72 downstream of the ejector/mixer and sound absorbing structure 18 bounding the flowpath throughout the diffusion region. The method includes deploying the ejector/mixer 176 at take-off and stowing the ejector/mixer at cruise
Strange Particles from NEXUS 3
After discussing conceptual problems with the conventional string model, we
present a new approach, based on a theoretically consistent multiple scattering
formalism. First results for strange particle production in proton-proton
scattering at 158 GeV and at 200 GeV (cms) are discussed.Comment: invited talk, given at the Strange Quark Matter Conference, Atlantic
Beach, North Carolina, March 12-17, 200
Public Relations Work to Increase Attainability Relating to EMail-Communication
The mere allotment of an e-mail address does in no way ensure answering quotas, which could be called sufficient to dependably hand out important information via roundmail. A loss of accessibility through e-mail addresses already provided by the university can be due to various technical problems and personal deficiencies of motivation. Students in particular often use external providers and are often also not on familiar terms with the use of consistent personal e-mail archives, POP-accounts, Web-Mail-Portals and the use of forewarding functions. Special email-courses are being offered within regular further training for staff and students
Strange Particle Production in p+p, p+Pb and Pb+Pb Interactions from NA49
Recent NA49 results on Lambda, Antilambda, Xi- and Antixi+ production in
minimum bias p+p and centrality selected p+Pb collisions at 158 GeV/c, and the
results on Lambda, Antilambda, K+ and K- production in central Pb+Pb collisions
at 40, 80 and 158 A GeV are discussed and compared with other available data.
By comparing the energy dependence of Lambda and Antilambda production at
mid-rapidity a striking similarity is observed between p+p and A+A data. This
is also seen in the energy dependence of the Lambda/pi ratio. K+/pi at
mid-rapidity is affected in a similar way, due to the associated production of
K+ together with Lambda particles. The observed yields increase faster than the
number of wounded nucleons when comparing p+Pb to p+p. As already observed in
A+A collisions, the increase is larger for multistrange than for strange
baryons and for baryons than for anti-baryons.Comment: 8 pages, 10 figures, To appear in proceedings of Strange Quark in
Matter 2001-A Flavourspace Odyssey, Frankfurt am Main, Germany, 24-29. Sept.
200
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