Identified Hadron Compositions in p+p and Au+Au Collisions at High Transverse Momenta at √sNN=200  GeV

Identified Hadron Compositions in p+p and Au+Au Collisions at High Transverse Momenta at √sNN=200  GeV

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 colli...

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Bibliographic Details
Main Authors: 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.
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Physical Society 2013
Online Access:http://hdl.handle.net/1721.1/78678
https://orcid.org/0000-0002-5515-4563
https://orcid.org/0000-0001-5839-707X
https://orcid.org/0000-0002-0031-1963
https://orcid.org/0000-0002-9107-6312
Description
Summary: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.

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