New Work Processes and Operation Forms: Efficient Data Utilisation and Online Collaboration

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435.

Using strange hadrons as probes of dense matter

“…The R CP measure, on the other hand, shown in Fig. 4a, shows R AA (Ξ) = R AA (Λ) = R AA (p) and an R CP maximum of approximately 0.8 [7]. The inclusion of the kaon and π in Fig.…”

“…Such a scaling is predicted in the Grand Canonical regime when strangeness is fully equilibrated. Figure 2a shows the results of this calculation at RHIC [7] compared to those from NA57 at the SPS for Pb-Pb collisions at √ s NN = 17.3 GeV [8,9]. Also shown are the results for STAR's measured inclusive protons, which include all feed-down protons from hyperon decays.…”

Jets as a probe of dense matter at RHIC

“…The flavor dependence of the Cronin effect in d+Au collisions is shown to be not large enough to explain the p/π ratio measured in Au+Au collisions. STAR data [22] on Λ, K 0 , Ξ and K * (892) production in Au+Au collisions demonstrate that the difference is due to a baryon/meson effect and seems to be confined to the region of p T =2-6 GeV/c.…”

“…Identified hadron jet studies in Au+Au collisions may be able to probe the energy loss difference of quarks versus gluons as well as possible modifications in flavor composition and multiplicities in a jet due to coalescence/recombination in the medium. Several aspects of particle production in central Au+Au collisions at RHIC in the p T -range of 2-6 GeV/c are incompatible with jet fragmentation in simpler systems: large p/π ratio [20], antibaryon to baryon ratio constant with p T [22], different suppression of proton/pion [20] and lambda/kaon yields [22], and deviation from hydrodynamic mass-ordering in strength of elliptic flow of pions/protons [23] and kaons/lambdas [24]. Models based on coalescence of thermal partons are successful in qualitatively describing the features observed in the data [25].…”