35,918 research outputs found
Antiparticle to particle ratios and identified hadron spectra in Cu+Cu and Au+Au collisions
New results on antiparticle to particle ratios in Cu+Cu and Au+Au collisions
at sqrt(s_NN) = 62.4 and 200 GeV from the PHOBOS experiment at RHIC are
presented. Transverse momentum spectra of pions, kaons, protons and antiprotons
from Au+Au collisions at sqrt(s_NN) = 62.4 GeV close to mid-rapidity are also
discussed. Antiparticle to particle ratios are found to be remarkably
independent of the collision centrality in both colliding systems. The
collision energy dependence of the pbar/p ratios is very significant in Cu+Cu
collisions. Baryons are found to have substantially harder transverse momentum
spectra than mesons. The pT region in which the proton to pion ratio reaches
unity in central Au+Au collisions at sqrt(s_NN) = 62.4 GeV fits into a smooth
trend as a function of collision energy. The observed particle yields at very
low pT are comparable to extrapolations from higher pT for kaons, protons and
antiprotons. The net proton yield at mid-rapidity is found to be proportional
to the number of participant nucleons in Au+Au collisions at 62.4 and 200 GeV
energies.Comment: 5 pages, 3 figures, Presented at the Quark Matter 2006 conference in
Shanghai, Chin
BRAHMS Overview
A brief review of BRAHMS measurements of bulk particle production in RHIC
Au+Au collisions at is presented, together with some
discussion of baryon number transport. Intermediate measurements in
different collision systems (Au+Au, d+Au and p+p) are also discussed in the
context of jet quenching and saturation of the gluon density in Au ions at RHIC
energies. This report also includes preliminary results for identified
particles at forward rapidities in d+Au and Au+Au collisions.Comment: 8 pages 6 figures, Invited plenary talk at 5th International
Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP 2005),
Salt Lake City, Kolkata, India, 8-12 Feb 200
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