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

Journal Article · · Physical Review C
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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±1.0GeV/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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Contributing Organization:
ALICE Collaboration
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1324869
Alternate ID(s):
OSTI ID: 1423606
Journal Information:
Physical Review C, Journal Name: Physical Review C Vol. 94 Journal Issue: 3; ISSN 2469-9985
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Entropy production in p p and Pb-Pb collisions at energies available at the CERN Large Hadron Collider journal December 2019
Universal freezeout condition for charged hadrons in a hybrid approach journal March 2018


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