Identified Hadron Compositions in p+p and Au+Au Collisions at High Transverse Momenta at √sNN=200 GeV
Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross; Hays-Wehle, James Prewitt; Leight, William Axel; Milner, Richard G.; Redwine, Robert P; Seele, J.; Steadman, Stephen G.; Surrow, Bernd; van Nieuwenhuizen, G.; Walker, M.; ... Show more Show less
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We report transverse momentum (pT≤15 GeV/c) spectra of π[superscript ±], K[superscript ±], p, p̅ , K[subscript S][superscript 0], and ρ[superscript 0] at midrapidity in p+p and Au+Au collisions at √sNN=200 GeV. Perturbative QCD calculations are consistent with π[superscript ±] spectra in p+p collisions but do not reproduce K and p(p̅ ) spectra. The observed decreasing antiparticle-to-particle ratios with increasing p[subscript T] provide experimental evidence for varying quark and gluon jet contributions to high-p[subscript T] hadron yields. The relative hadron abundances in Au+Au at p[subscript T]≳8 GeV/c are measured to be similar to the p+p results, despite the expected Casimir effect for parton energy loss.
Date issued
2012-02Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Agakishiev, G., M. M. Aggarwal, Z. Ahammed, et al. Identified Hadron Compositions in P+p and Au+Au Collisions at High Transverse Momenta at sqrt[s_{NN}]=200 GeV. Physical Review Letters 108(7). 2012. © 2012 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114