Beam Energy Dependence of Jet-Quenching Effects in Au plus Au Collisions at √<i>s</i><sub>NN</sub>=7.7, 11.5, 14.5, 19.6, 27, 39, and 62.4 GeV



Adamczyk, L, Adams, JR, Adkins, JK, Agakishiev, G, Aggarwal, MM, Ahammed, Z, Ajitanand, NN, Alekseev, I, Anderson, DM, Aoyama, R
et al (show 339 more authors) (2018) Beam Energy Dependence of Jet-Quenching Effects in Au plus Au Collisions at √<i>s</i><sub>NN</sub>=7.7, 11.5, 14.5, 19.6, 27, 39, and 62.4 GeV. PHYSICAL REVIEW LETTERS, 121 (3). 032301-.

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Abstract

We report measurements of the nuclear modification factor R_{CP} for charged hadrons as well as identified π^{+(-)}, K^{+(-)}, and p(p[over ¯]) for Au+Au collision energies of sqrt[s_{NN}]=7.7, 11.5, 14.5, 19.6, 27, 39, and 62.4 GeV. We observe a clear high-p_{T} net suppression in central collisions at 62.4 GeV for charged hadrons which evolves smoothly to a large net enhancement at lower energies. This trend is driven by the evolution of the pion spectra but is also very similar for the kaon spectra. While the magnitude of the proton R_{CP} at high p_{T} does depend on the collision energy, neither the proton nor the antiproton R_{CP} at high p_{T} exhibit net suppression at any energy. A study of how the binary collision-scaled high-p_{T} yield evolves with centrality reveals a nonmonotonic shape that is consistent with the idea that jet quenching is increasing faster than the combined phenomena that lead to enhancement.

Item Type: Article
Additional Information: 3 figures
Uncontrolled Keywords: STAR Collaboration
Depositing User: Symplectic Admin
Date Deposited: 04 Feb 2020 16:06
Last Modified: 10 Oct 2023 22:25
DOI: 10.1103/PhysRevLett.121.032301
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3073443