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Differential measurements of elliptic flow (v2) for Au+Au and Cu+Cu collisions at sqrt[sNN]=200 GeV are used to test and validate predictions from perfect fluid hydrodynamics for scaling of v2 with eccentricity, system size, and transverse kinetic energy (KE T). For KE T identical with mT-m up to approximately 1 GeV the scaling is compatible with(More)
New data are presented on charged particle pseudorapidity distributions for inelastic events produced at c.m. energies ]//s=200 and 900 GeV. The data were obtained at the CERN antiproton-proton Collider operated in a new pulsed mode. The rise of the central density p(0) at energies up to ]fs = 900 GeV has been studied. A new form of central region scaling(More)
In a joint experiment the TAPS and CERES collaborations have studied the production of the neutral mesons ; and ! in 450 GeV p-Be and p-Au collisions at the CERN SPS. The mesons were identiied by their ! , ! , and ! ! decay modes. The cross sections were measured down to very low p T (20 MeV/c) near mid-rapidity (3:0 < y < 4:0). The and ! cross sections are(More)
Measurements of event-by-event fluctuations of the mean transverse momentum in Pb-Au collisions at 40, 80, and 158 A GeV/c are presented. A significant excess of mean p T fluctuations at mid-rapidity is observed over the expectation from statistically independent particle emission. The results are somewhat smaller than recent measurements at RHIC. A(More)
The double helicity asymmetry in neutral pion production for pT=1 to 12 GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, DeltaG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of micro2=4 GeV2 a next to leading order QCD analysis gives DeltaG[0.02,0.3]=0.2, with a constraint of(More)
In a joint eeort the CERES/NA45 and TAPS collaborations have measured low-mass electron pairs in p{Be and p{Au collisions at 450 GeV/c at the CERN SPS. In the range covered up to 1.5 GeV/c 2 the mass spectra from p{Be and p{Au collisions are well explained by electron pairs from decays of neutral mesons. For p{Au our result is new. For p{Be, the(More)
Transverse momentum spectra of neutral pions in the range 1<p(T)<10 GeV/c have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au+Au collisions at sqrt[s(NN)]=200 GeV. The pi(0) multiplicity in central reactions is significantly below the yields measured at the same sqrt[s(NN)] in peripheral Au+Au and p+p reactions scaled by the number(More)
At this conference first data from RHIC has been presented. Spectra of charged hadrons and identified neutral pions obtained in central collisions exhibit a depletion at large transverse momenta compared to expectations deduced from pp and ¯ pp data and lower energy heavy ion data. While spectra measured in peripheral collisions exhibit the expected(More)
During the 1996 lead run time, CERES has accumulated 42 million events, corresponding to a factor of 5 more statistics than in 1995 and 2.5 million events of a special photon-run. We report on the results of the low-mass e + e −-pair analysis. Since the most critical item is the poor signal-to-background ratio we also discuss the understanding of this(More)