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

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    Authors
    ALICE Collaboration
    Barnby, Lee cc
    Affiliation
    European Organization for Nuclear Research (CERN)
    University of Birmingham
    Issue Date
    2016-09-15
    
    Metadata
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    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±1.0 GeV/fm3 and that the energy density at the most central 80fm2 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.
    Citation
    J. Adam et al. (ALICE Collaboration) Physical Review C, 94, 034903
    Publisher
    American Physical Society
    Journal
    Physical Review C
    URI
    http://hdl.handle.net/10545/620944
    DOI
    10.1103/PhysRevC.94.034903
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevC.94.034903
    Type
    Article
    Language
    en
    ISSN
    2469-9985
    EISSN
    2469-9993
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevC.94.034903
    Scopus Count
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    Department of Electronics, Computing & Maths

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