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Published October 13, 2006 | Published
Journal Article Open

Identified Baryon and Meson Distributions at Large Transverse Momenta from Au+Au Collisions at √sNN=200 GeV


Transverse momentum spectra of π^±, p, and p̅ up to 12  GeV/c at midrapidity in centrality selected Au+Au collisions at √sNN=200   GeV are presented. In central Au+Au collisions, both π^± and p(p̅ ) show significant suppression with respect to binary scaling at p_T≳4  GeV/c. Protons and antiprotons are less suppressed than π^±, in the range 1.5≲p_T≲6  GeV/c. The π-/π+ and p̅ /p ratios show at most a weak p_T dependence and no significant centrality dependence. The p/π ratios in central Au+Au collisions approach the values in p+p and d+Au collisions at p_T≳5  GeV/c. The results at high p_T indicate that the partonic sources of π^±, p, and p̅ have similar energy loss when traversing the nuclear medium.

Additional Information

© 2006 The American Physical Society. Received 1 June 2006; published 11 October 2006. We thank Dr. M. Djordjevic, R. J. Fries, R. C. Hwa, I. Vitev, and X. N. Wang for valuable discussions and for providing the theory calculations. We thank the RHIC Operations Group and RCF at BNL and the NERSC Center at LBNL for their support. This work was supported in part by the Offices of NP and HEP within the U.S. DOE Office of Science; the U.S. NSF; the BMBF of Germany; CNRS/IN2P3, RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of Brazil; the Russian Ministry of Science and Technology; the Ministry of Education and the NNSFC of China; IRP and GA of the Czech Republic; FOM of the Netherlands; DAE, DST, and CSIR of the Government of India; Swiss NSF; the Polish State Committee for Scientific Research; SRDA of Slovakia; and the Korea Science and Engineering Foundation.

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