Measurement of transverse energy at midrapidity in Pb-Pb collisions at √sNN=2.76 TeV

Adam, J. and Antičić, Tome and Erhardt, Filip and Gotovac, Sven and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zyzak, M. (ALICE Collaboration) (2016) Measurement of transverse energy at midrapidity in Pb-Pb collisions at √sNN=2.76 TeV. Physical Review C, 94 (3). pp. 34903-19. ISSN 2469-9985

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We report the transverse energy (ET) measured with ALICE at midrapidity in Pb-Pb collisions at √sNN = 2.76 TeV as a function of centrality. The transverse energy was measured using identified single-particle tracks. The measurement was cross checked using the electromagnetic calorimeters and the transverse momentum distributions of identified particles previously reported by ALICE. The results are compared to theoretical models as well as to results from other experiments. The mean ET per unit pseudorapidity (η), dET/dη , in 0%–5% central collisions is 1737 ± 6(stat.) ± 97(sys.) GeV. We find a similar centrality dependence of the shape of dET/dη as a function of the number of participating nucleons to that seen at lower energies. The growth in dET/dη at the LHC energies exceeds extrapolations of low-energy data. We observe a nearly linear scaling of dET/dη with the number of quark participants. With the canonical assumption of a 1 fm/c formation time, we estimate that the energy density in 0%–5% central Pb-Pb collisions at √sNN = 2.76 TeV is 12.3 ± 1.0 GeV/fm3 and that the energy density at the most central 80 fm2 of the collision is at least 21.5 ± 1.7 GeV/fm3 . This is roughly 2.3 times that observed in 0%–5% central Au-Au collisions at √sNN = 200 GeV.

Item Type: Article
Date: 15 September 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 16 March 2016; published 15 September 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 29 Nov 2016 19:35
Last Modified: 29 Nov 2017 16:40

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