Spectra and ratios of identified particles in Au+Au and dd+Au collisions at sNN=200\sqrt{s_{NN}}=200 GeV

Collaboration
Apr 11, 2013
16 pages
Published in:
  • Phys.Rev.C 88 (2013) 2, 024906
  • Published: Aug 22, 2013
e-Print:
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Abstract: (APS)
The transverse momentum (pT) spectra and ratios of identified charged hadrons (π±, K±, p, p¯) produced in sNN=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 pT=6 GeV/c (5 GeV/c), and the measurements of kaons are reported up to pT=4 GeV/c (3.5 GeV/c) in Au+Au (d+Au) collisions. In the intermediate pT region, between 2 and 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 pT-dependent particle ratios for these classes display a remarkable similarity, which is then discussed.
Note:
  • 416 authors, 18 pages, 15 figures, 4 tables. Submitted to Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html
  • 25.75.Dw
  • 25.75.Ld
  • transverse momentum: momentum spectrum
  • nucleon nucleon: interaction
  • meson baryon: ratio
  • heavy ion: scattering
  • deuteron
  • gold
  • hadron: hadroproduction
  • yield: ratio