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

Adam, J.; Adamova, D.; Aggarwal, M.M; Aglieri Rinella, G; Agnello, M.; Agrawal, N; Christiansen, Peter LU ; Ljunggren, Martin LU ; Oskarsson, Anders LU and Richert, Tuva LU , et al. (2016) In Physical Review C: covering nuclear physics 94(3).
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... (More)
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. ©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. (Less)
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Physical Review C: covering nuclear physics
volume
94
issue
3
publisher
American Physical Society
external identifiers
  • scopus:84990055886
  • wos:000383149400002
ISSN
2469-9985
DOI
10.1103/PhysRevC.94.034903
language
English
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yes
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7c33463b-0712-4645-8e79-a1299f3b8328
date added to LUP
2017-07-14 12:05:03
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2017-11-14 09:50:07
@article{7c33463b-0712-4645-8e79-a1299f3b8328,
  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. ©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.},
  articleno    = {034903},
  author       = {Adam, J. and Adamova, D. and Aggarwal, M.M and Aglieri Rinella, G and Agnello, M. and Agrawal, N and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and , },
  issn         = {2469-9985},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {	Physical Review C: covering nuclear physics},
  title        = {Measurement of transverse energy at midrapidity in Pb-Pb collisions at s NN =2.76 TeV},
  url          = {http://dx.doi.org/10.1103/PhysRevC.94.034903},
  volume       = {94},
  year         = {2016},
}