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

Agakishiev, G. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2012) Identified Hadron Compositions in p+p and Au+Au Collisions at High Transverse Momenta at √sNN=200  GeV. Physical Review Letters, 108 (7). pp. 72302-6. ISSN 0031-9007

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Abstract

We report transverse momentum (pT≤15  GeV/c) spectra of π±, K±, p, p¯, K0S, and ρ0 at midrapidity in p+p and Au+Au collisions at √sNN=200  GeV. Perturbative QCD calculations are consistent with π± spectra in p+p collisions but do not reproduce K and p(p¯) spectra. The observed decreasing antiparticle-to-particle ratios with increasing pT provide experimental evidence for varying quark and gluon jet contributions to high-pT hadron yields. The relative hadron abundances in Au+Au at pT≳8  GeV/c are measured to be similar to the p+p results, despite the expected Casimir effect for parton energy loss.

Item Type: Article
Keywords: hadron, composition, transverse, STAR
Date: February 2012
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2012) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 05 Jun 2014 11:17
Last Modified: 23 Feb 2016 16:11
URI: http://digre.pmf.unizg.hr/id/eprint/2254

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