Azimuthal di-hadron correlations in d+ Au and Au + Au collisions at √sNN=200 GeV measured at the STAR detector

Aggarwal, M. M. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2010) Azimuthal di-hadron correlations in d+ Au and Au + Au collisions at √sNN=200 GeV measured at the STAR detector. Physical Review C, 82 (2). pp. 24912-14. ISSN 0556-2813

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Abstract

Yields, correlation shapes, and mean transverse momenta pT of charged particles associated with intermediate- to high-pT trigger particles (2.5<pT<10 GeV/c) in d+ Au and Au + Au collisions at √sNN=200 GeV are presented. For associated particles at higher pT≳2.5 GeV/c, narrow correlation peaks are seen in d+ Au and Au + Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle pT<2 GeV/c, a large enhancement of the near- (Δϕ~0) and away-side (Δϕ~π) associated yields is found, together with a strong broadening of the away-side azimuthal distributions in Au + Au collisions compared to d+ Au measurements, suggesting that other particle production mechanisms play a role. This is further supported by the observed significant softening of the away-side associated particle yield distribution at Δϕ~π in central Au + Au collisions.

Item Type: Article
Keywords: particle, yield particle, production hadron hadron, correlation jet, fragmentation STAR hadron, angular distribution charged particle, transverse momentum interaction, (deuteron nucleus) nucleus nucleus, interaction heavy ion, scattering charged particle, multiplicity Brookhaven RHIC Coll 200 GeV-cms/nucleon
Date: August 2010
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2010) 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 12:52
Last Modified: 24 Feb 2016 15:29
URI: http://digre.pmf.unizg.hr/id/eprint/2271

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