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Article
Identified Baryon and Meson Distributions at Large Transverse Momenta from Au Plus Au Collisions at Root(S)(Nn)=200 Gev
Physical Review Letters
  • B. I. Abelev
  • Quan Li, Kent State University - Kent Campus
  • STAR Collaboration
Publication Date
10-13-2006
Document Type
Article
DOI
10.1103/PhysRevLett.97.152301
Keywords
  • hadron spectra,
  • fragmentation functions,
  • D+Au collisions,
  • quark,
  • P+P
Disciplines
Abstract

Transverse momentum spectra of pi(+/-), p, and (p) over bar p up to 12 GeV/c at midrapidity in centrality selected Au + Au collisions at root s(NN) = 200 GeV are presented. In central Au + Au collisions, both pi(+/-) and p((p) over bar) show significant suppression with respect to binary scaling at p(T) greater than or similar to 4 GeV/c. Protons and antiprotons are less suppressed than pi(+/-), in the range 1.5 less than or similar to p(T) less than or similar to 6 GeV/c. The pi(-)/pi(+) and (p) over bar /p ratios show at most a weak pT dependence and no significant centrality dependence. The p/pi ratios in central Au + Au collisions approach the values in p + p and d + Au collisions at p(T) greater than or similar to 5 GeV/c. The results at high p(T) indicate that the partonic sources of pi(+/-), p, and (p) over bar have similar energy loss when traversing the nuclear medium.

Comments

Copyright 2006 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.97.152301

Citation Information
B. I. Abelev, Quan Li and None STAR Collaboration. "Identified Baryon and Meson Distributions at Large Transverse Momenta from Au Plus Au Collisions at Root(S)(Nn)=200 Gev" Physical Review Letters Vol. 97 Iss. 15 (2006)
Available at: http://works.bepress.com/quan_li/6/