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

Scientific paper - Original scientific paper

• Author: A. Adare
• Author: ...
• Author: Mihael Makek
• Author: ...
• Author: L. Zou
• Collaboration: PHENIX Collaboration
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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.

• Keywords (english): QGP; identified hadrons; pt scaling
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C
• Numbering: vol. 93, no. 2, 024911
• p-ISSN: 2469-9985
• DOI: https://doi.org/10.1103/PhysRevC.93.024911
• URN:NBN: urn:nbn:hr:217:121784
• Publication: 2016
• Document URL: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.93.024911
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2016) by the American Physical Society. Received 5 October 2015; published 22 February 2016.
• Created on: 2020-02-23 10:31:15