Scaling properties of fractional momentum loss of high- pT hadrons in nucleus-nucleus collisions at √sNN from 62.4 GeV to 2.76 TeV

Adare, A. and Makek, Mihael and Zou, L. (PHENIX Collaboration) (2016) Scaling properties of fractional momentum loss of high- pT hadrons in nucleus-nucleus collisions at √sNN from 62.4 GeV to 2.76 TeV. Physical Review C, 93 (2). pp. 24911-20. ISSN 0556-2813

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Abstract

Measurements of the fractional momentum loss (Sloss ≡ δpT /pT ) of high-transverse-momentum-identified hadrons in heavy-ion collisions are presented. Using π0 in Au + Au and Cu + Cu collisions at √sNN = 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb + Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of Sloss as a function of a number of variables: the number of participants, Npart, the number of quark participants, Nqp, the charged-particle density, dNch/dη, and the Bjorken energy density times the equilibration time, εBjτ0. We find that the pT , where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at √sNN = 200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of Sloss with dNch/dη and εBjτ0, lending insight into the physics of parton energy loss.

Item Type: Article
Date: 22 February 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2016) by the American Physical Society. Received 5 October 2015; published 22 February 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 26 Feb 2016 15:00
Last Modified: 26 Feb 2016 15:00
URI: http://digre.pmf.unizg.hr/id/eprint/4526

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