• Open Access

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

J. Adam et al. (ALICE Collaboration)
Phys. Rev. C 94, 034903 – Published 15 September 2016

Abstract

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±1.0GeV/fm3 and that the energy density at the most central 80fm2 of the collision is at least 21.5±1.7GeV/fm3. This is roughly 2.3 times that observed in 0%–5% central Au-Au collisions at sNN=200 GeV.

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  • Received 16 March 2016

DOI:https://doi.org/10.1103/PhysRevC.94.034903

This article is available 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.

©2016 CERN, for the ALICE Collaboration

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 94, Iss. 3 — September 2016

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