Centrality-Dependent Modification of Jet-Production Rates in Deuteron-Gold Collisions at √sNN=200  GeV

Adare, A. and Makek, Mihael and Zou, L. (PHENIX Collaboration) (2016) Centrality-Dependent Modification of Jet-Production Rates in Deuteron-Gold Collisions at √sNN=200  GeV. Physical Review Letters, 116 (12). pp. 122301-9. ISSN 0031-9007

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Abstract

Jet production rates are measured in p+p and d+Au collisions at √sNN=200  GeV recorded in 2008 with the PHENIX detector at the Relativistic Heavy Ion Collider. Jets are reconstructed using the R=0.3 anti-k_t algorithm from energy deposits in the electromagnetic calorimeter and charged tracks in multiwire proportional chambers, and the jet transverse momentum (p_T) spectra are corrected for the detector response. Spectra are reported for jets with 12<pT<50  GeV/c, within a pseudorapidity acceptance of |η|<0.3. The nuclear-modification factor (R_dAu) values for 0%–100% d+Au events are found to be consistent with unity, constraining the role of initial state effects on jet production. However, the centrality-selected RdAu values and central-to-peripheral ratios (R_CP) show large, pT-dependent deviations from unity, challenging the conventional models that relate hard-process rates and soft-particle production in collisions involving nuclei.

Item Type: Article
Date: 24 March 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 American Physical Society. Received 5 October 2015; revised manuscript received 7 January 2016; published 24 March 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 24 Apr 2016 18:17
Last Modified: 24 Apr 2016 18:17
URI: http://digre.pmf.unizg.hr/id/eprint/4789

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