883 research outputs found
Extended Longitudinal Scaling: direct evidence of saturation
Multiparticle production of charged particles at high energies exhibit the
phenomenon of Limiting Fragmentation. Furthermore, the region in rapidity over
which the production of particles appears to be independent of energy,
increases with energy. It is argued that this phenomenon, known as Extended
Longitudinal Scaling, is a direct manifestation of some kind of saturation,
akin to that in the Color Glass Condensate picture of particle production.Comment: 10 pages, 10 figures, Invited paper presented at The Glasma Workshop,
BNL, May 201
(Di)lepton physics with ALICE
Physics perspectives with(di)lepton measurements with the ALICE detector at
the LHC are reviewed. Special emphasis is placed on heavy flavor physics.Comment: 4 pages, 1 figure, 18th International Conference on Ultrarelativistic
Nucleus-Nucleus Collisions : Quark Matter 2005, Budapest, Hongrie, Ao\^{u}t
2005, submitted to Nuclear Physic
Identified Particle Jet Correlations from PHENIX
Two-particle azimuthal correlations have been shown to be a powerful probe
for extracting novel features of the interaction between hard scattered partons
and the medium produced in Au+Au collisions at RHIC. At intermediate ,
2-5GeV/c, jets have been shown to be significantly modified in both particle
composition and angular distribution compared to p+pcollisions. We present
recent PHENIX results from Au+Au collisions for a variety of and particle
combinations.Comment: Parallel talk given at Quark Matter 2006, Shanghai Chin
PHENIX measurement of jet properties and their modification in heavy-ion collisions
The properties of jets produced in p+p, d+Au and Au+Au collisions at
sqrt{s_NN}=200 GeV are studied using the method of two particle correlations.
The trigger particle is assumed to be a leading particle from a high p_T jet
while the associated particle is assumed to come from either the same jet or
the away jet. From the angular width and yield of the same and away side
correlation peaks, the parameters characterizing the jet properties are
extracted.Comment: 4 pages, 3 figures, contribution to the proceedings of the 17th
International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions
(Quark Matter, Oakland, January 11-17, 2004). To appear in the proceedings
(Journal of Physics G
Neutral Pion Distributions in PHENIX at RHIC
Transverse momentum spectra for identified 's in the range 1 GeV/c 4 GeV/c have been measured by the PHENIX experiment in Au-Au collisions
at GeV. The spectra from peripheral nuclear collisions are
consistent with the simple expectation of scaling the spectra from p+p
collisions by the average number of nucleon-nucleon binary collisions. The
spectra from central collisions and the ratio of central/peripheral spectra are
significantly suppressed when compared to point-like scaling.Comment: 6 pages, 3 figure
Two Particle Azimuthal Correlation Measurements in PHENIX
Two particle azimuthal correlation functions are presented for charged
hadrons produced in Au-Au collisions at RHIC sqrt(s_NN)=200 GeV.The correlation
functions indicate sizeable asymmetries and anisotropies. The trend of the
asymmetries is compatible with the presence of emission patterns associated
with mini-jets. The magnitude and the trend of the differential anisotropies
v_2(p_T) and v_2(N_Part), provide important model constraints.Comment: 4 pages 3 fig
Hadron production in the forward and backward rapidities in dAu collisions at RHIC
We have developed new techniques to detect hadrons with the PHENIX muon
spectrometers. This allows us to study the centrality dependent nuclear
modification factor with high hadrons in both forward (d
direction) and backward (Au direction) rapidities, , in dAu
collisions at . Preliminary results show a suppression
(enhancement) of high hadron production in central dAu
collisions relative to the peripheral one ( in centrality) at forward
(backward) rapidity.Comment: 4 pages, 4 figures, Quark Matter 2004 tal
Results on Photon Production in Au+Au Collisions at RHIC
The status of the search for direct photons in Au+Au collisions at sqrt{s_NN}
= 130 GeV and sqrt{s_NN} = 200 GeV with the PHENIX experiment is presented.
Within errors, no excess of direct photons was found in a first analysis pass
done on a limited data set. Significantly reduced systematic and statistical
uncertainties are expected in future analyses.Comment: 4 pages, 3 figures. Talk presented at the Quark Matter 2002
conference, Nantes, France, July 18-24, 2002. To appear in the proceedings
(Nucl. Phys. A
Strange Particle Abundance in QGP Formed in 200 GeV A Nuclear Collisions
We investigate here the relative abundance of strange particles produced in
nuclear collisions at the SPS energies (9 GeV A in CM frame) assuming that the
central reaction fireball consists of quark-gluon plasma. We show that the
total strangeness yield in S-S, S-Ag and S-W reactions is compatible with this
picture.Comment: 11 pages, LaTeX, 3 postscript figures, Phys. Lett. B 323 (1994) 39
Extracting Nuclear Transparency from p-A Cross sections
We study nuclear structure effects on the transparency in high transverse
momentum and reactions. We show that in the DWIA-eikonal
approximation, even when correlations are included, one can get a factorized
expression for the transparency. This depends only on the average nucleon
density and a correlation function. We develop a technique to include
correlations in a Monte-Carlo Glauber type calculation. We compare calculations
of using the eikonal formalism and a continuous density, with a Monte Carlo
method based on discrete nucleons.Comment: 22 pages, 9 postscript figures. LaTeX with epsf styl
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