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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00464140" target="_blank" >RIV/68378271:_____/16:00464140 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/16:00464140 RIV/68407700:21340/16:00302281

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevC.94.034903" target="_blank" >http://dx.doi.org/10.1103/PhysRevC.94.034903</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.94.034903" target="_blank" >10.1103/PhysRevC.94.034903</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BF - Elementární částice a fyzika vysokých energií

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review C

ISSN

2469-9985

e-ISSN

—

Svazek periodika

94

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

19

Strana od-do

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Kód UT WoS článku

000383149400002

EID výsledku v databázi Scopus

2-s2.0-84990055886