Measurement of transverse energy at midrapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV

Abstract

We report the transverse energy ($E_{\mathrm{T}}$) measured with ALICE at midrapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 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 $E_{\mathrm{T}}$ per unit pseudorapidity ($\eta$), $⟨$d$E_{\mathrm{T}}/$d$\eta ⟩$, in 0-5% central collisions is 1737 $\pm$ 6(stat.) $\pm$ 97(sys.) GeV. We find a similar centrality dependence of the shape of $⟨$d$E_{\mathrm{T}}/$d$\eta ⟩$ as a function of the number of participating nucleons to that seen at lower energies. The growth in $⟨$d$E_{\mathrm{T}}/$d$\eta ⟩$ at the LHC $\sqrt{s_{\mathrm{NN}}}$ exceeds extrapolations of low energy data. We observe a nearly linear scaling of $⟨$d$E_{\mathrm{T}}/$d$\eta ⟩$ 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 $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV is 12.3 $\pm$ 1.0 GeV/fm${}^3$\xspace and that the energy density at the most central 80 fm${}^2$ of the collision is at least 21.5 $\pm$ 1.7 GeV/fm${}^3$. This is roughly 2.3 times that observed in 0-5% central Au-Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV.

30 pages, 14 captioned figures, 2 tables, authors from page 25, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2400

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• K${}_{\mathrm{S}}^0$ and $\mathrm{\Lambda }$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Measurement of the pseudorapidity and transverse momentum dependence of the elliptic flow of charged particles in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector
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• Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector
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• Transverse energy production and charged-particle multiplicity at midrapidity in various systems from $\sqrt{s_{NN}}=7.7$ to 200 GeV
• Measurement of the inclusive differential jet cross section in pp collisions at $\sqrt{s}$ = 2.76 TeV
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• Measurement of the pseudorapidity and centrality dependence of the transverse energy density in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Transverse-energy distributions at midrapidity in $p$$+$$p$, $d$$+$Au, and Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=62.4$--200~GeV and implications for particle-production models
• Systematics of the charged-hadron P_T spectrum and the nuclear suppression factor in heavy-ion collisions from sqrt{s}=200 GeV to sqrt{s} =2.76 TeV
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• Transverse momentum dependence of eta meson suppression in Au+Au collisions at sqrt(s_NN) = 200 GeV

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