| Abstract: | The transverse momentum (p_T) spectra and ratios of identified charged
hadrons (pi^+/-, K^+/-, p, p^bar) produced in sqrt(s_NN)=200 GeV Au+Au and
d+Au collisions are reported in five different centrality classes for each
collision species. The measurements of pions and protons are reported up to
p_T=6 GeV/c (5 GeV/c), and the measurements of kaons are reported up to p_T=4
GeV/c (3.5 GeV/c) in Au+Au (d+Au) collisions. In the intermediate p_T region,
between 2--5 GeV/c, a significant enhancement of baryon to meson ratios
compared to those measured in p+p collisions is observed. This enhancement is
present in both Au+Au and d+Au collisions, and increases as the collisions
become more central. We compare a class of peripheral Au+Au collisions with a
class of central d+Au collisions which have a comparable number of
participating nucleons and binary nucleon-nucleon collisions. The p_T dependent
particle ratios for these classes display a remarkable similarity, which is
then discussed. |
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