9,570 research outputs found
Charged Particle Multiplicities in Ultra-relativistic Au+Au and Cu+Cu Collisions
The PHOBOS collaboration has carried out a systematic study of charged
particle multiplicities in Cu+Cu and Au+Au collisions at the Relativistic
Heavy-Ion Collider (RHIC) at Brookhaven National Laboratory. A unique feature
of the PHOBOS detector is its ability to measure charged particles over a very
wide angular range from 0.5 to 179.5 deg. corresponding to |eta|<5.4. The
general features of the charged particle multiplicity distributions as a
function of pseudo-rapidity, collision energy and centrality, as well as system
size, are discussed.Comment: Proceedings of "Lake Louise Winter Institute 2006", Lake Louise,
Alberta, Canada, February 17-23, 2006, World Scientific 5 pages, 3 figure
Consequences of energy conservation in relativistic heavy-ion collisions
Complete characterization of particle production and emission in relativistic
heavy-ion collisions is in general not feasible experimentally. This work
demonstrates, however, that the availability of essentially complete
pseudorapidity distributions for charged particles allows for a reliable
estimate of the average transverse momenta and energy of emitted particles by
requiring energy conservation in the process. The results of such an analysis
for Au+Au collisions at sqrt{s_{NN}}= 130 and 200 GeV are compared with
measurements of mean-p_T and mean-E_T in regions where such measurements are
available. The mean-p_T dependence on pseudorapidity for Au+Au collisions at
130 and 200 GeV is given for different collision centralities.Comment: 8 pages, 8 figures, Submitted to Phys. Rev.
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