180 research outputs found

    Real Time Global Tests of the ALICE High Level Trigger Data Transport Framework

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    The High Level Trigger (HLT) system of the ALICE experiment is an online event filter and trigger system designed for input bandwidths of up to 25 GB/s at event rates of up to 1 kHz. The system is designed as a scalable PC cluster, implementing several hundred nodes. The transport of data in the system is handled by an object-oriented data flow framework operating on the basis of the publisher-subscriber principle, being designed fully pipelined with lowest processing overhead and communication latency in the cluster. In this paper, we report the latest measurements where this framework has been operated on five different sites over a global north-south link extending more than 10,000 km, processing a ``real-time'' data flow.Comment: 8 pages 4 figure

    Semi-Hard Scattering Unraveled from Collective Dynamics by Two-Pion Azimuthal Correlations in 158 A GeV/c Pb + Au Collisions

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    Elliptic flow and two-particle azimuthal correlations of charged hadrons and high-pTp_T pions (pT>p_T> 1 GeV/cc) have been measured close to mid-rapidity in 158A GeV/cc Pb+Au collisions by the CERES experiment. Elliptic flow (v2v_2) rises linearly with pTp_T to a value of about 10% at 2 GeV/cc. Beyond pTp_T\approx 1.5 GeV/cc, the slope decreases considerably, possibly indicating a saturation of v2v_2 at high pTp_T. Two-pion azimuthal anisotropies for pT>p_T> 1.2 GeV/cc exceed the elliptic flow values by about 60% in mid-central collisions. These non-flow contributions are attributed to near-side and back-to-back jet-like correlations, the latter exhibiting centrality dependent broadening.Comment: Submitted to Phys. Rev. Letters, 4 pages, 5 figure

    Leptonic and charged kaon decay modes of the ϕ\phi meson measured in heavy-ion collisions at the CERN SPS

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    We report a measurement of ϕ\phi meson production in central Pb+Au collisions at Elab_{lab}/A=158 GeV. For the first time in heavy-ion collisions, ϕ\phi mesons were reconstructed in the same experiment both in the K+^+K^- and the dilepton decay channel. Near mid-rapidity, this yields rapidity densities, corrected for production at the same rapidity value, of 2.05 +- 0.14(stat) +- 0.25(syst) and 2.04 +- 0.49(stat)+-{0.32}(syst), respectively. The shape of the measured transverse momentum spectra is also in close agreement in both decay channels. The data rule out a possible enhancement of the ϕ\phi yield in the leptonic over the hadronic channel by a factor larger than 1.6 at 95% CL.Comment: 11 pages, 4 figures,submitted to Phys. Rev. Let

    Os sistemas de informação geográfica no suporte a serviços móveis para o cidadão

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    O seguinte artigo descreve os trabalhos de investigação efectuados no âmbito do projecto USE-ME.GOV (USability-drivEn open platform for Mobile GOVernment), um projecto do 6º Programa Quadro, que tem como objectivo o fornecimento de uma plataforma aberta para a disponibilização de serviços móveis ao cidadão, podendo ser partilhada por uma rede de autarquias, instituições públicas e outros fornecedores de serviços de informação. O artigo explica como a informação geográfica e de localização dá suporte à contextualização do utilizador móvel, podendo essa informação ser cruzada e processada com outras dimensões que definem o contexto

    Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy

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    Differential elliptic flow spectra v2(pT) of \pi-, K0short, p, \Lambda have been measured at \sqrt(s NN)= 17.3 GeV around midrapidity by the CERN-CERES/NA45 experiment in mid-central Pb+Au collisions (10% of \sigma(geo)). The pT range extends from about 0.1 GeV/c (0.55 GeV/c for \Lambda) to more than 2 GeV/c. Protons below 0.4 GeV/c are directly identified by dE/dx. At higher pT, proton elliptic flow v2(pT) is derived as a constituent, besides \pi+ and K+, of the elliptic flow of positive pion candidates. The retrieval requires additional inputs: (i) of the particle composition, and (ii) of v2(pT) of positive pions. For (i), particle ratios obtained by NA49 were adapted to CERES conditions; for (ii), the measured v2(pT) of negative pions is substituted, assuming \pi+ and \pi- elliptic flow magnitudes to be sufficiently close. The v2(pT) spectra are compared to ideal-hydrodynamics calculations. In synopsis of the series \pi- - K0short - p - \Lambda, flow magnitudes are seen to fall with decreasing pT progressively even below hydro calculations with early kinetic freeze-out (Tf= 160 MeV) leaving not much time for hadronic evolution. The proton v2(pT) data show a downward swing towards low pT with excursions into negative v2 values. The pion-flow isospin asymmetry observed recently by STAR at RHIC, invalidating in principle our working assumption, is found in its impact on proton flow bracketed from above by the direct proton flow data, and not to alter any of our conclusions. Results are discussed in perspective of recent viscous dynamics studies which focus on late hadronic stages.Comment: 38 pages, 27 figures, 2 tables. Abstract and parts of introduction made more comprehensible; corrected typos; acknowledgement added. To appear in Nucl.Phys.

    Azimuthal dependence of pion source radii in Pb+Au collisions at 158 A GeV

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    We present results of a two-pion correlation analysis performed with the Au+Pb collision data collected by the upgraded CERES experiment in the fall of 2000. The analysis was done in bins of the reaction centrality and the pion azimuthal emission angle with respect to the reaction plane. The pion source, deduced from the data, is slightly elongated in the direction perpendicular to the reaction plane, similarly as was observed at the AGS and at RHIC.Comment: 5 pages, 2 figure

    Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c

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    We present a measurement of e+ee^+e^- pair production in central Pb-Au collisions at 158AA GeV/cc. As reported earlier, a significant excess of the e+ee^+e^- pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the ρ\rho spectral function over a density-dependent shift of the ρ\rho pole mass. The in-medium broadening model implies that baryon induced interactions are the key mechanism to in-medium modifications of the ρ\rho-meson in the hot fireball at SPS energy.Comment: Revised versio

    Flow and non-flow event anisotropies at the SPS

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    A study of differential elliptic event anisotropies (v_2) of charged particles and high-pt pions in 158 AGeV/c Pb+Au collisions is presented. Results from correlations with respect to the event plane and from two-particle azimuthal correlations are compared. The latter give systematically higher v_2 values at pt>1.2GeV/c providing possibly an evidence of a non-flow semihard component.Comment: 4 pages, 6 figures, Quark Matter 2002, Nantes, to appear in Nucl. Phys.
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