Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV - INSPIRE

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Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

ALICE

Collaboration

Dec 28, 2016

11 pages

Published in:

Phys.Lett.B 772 (2017) 567-577

Published: Sep 10, 2017

e-Print:

1612.08966 [nucl-ex]

DOI:

10.1016/j.physletb.2017.07.017

Report number:

CERN-EP-2016-327

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Elsevier)

We present the charged-particle pseudorapidity density in Pb–Pb collisions at sNN=5.02 TeV in centrality classes measured by ALICE. The measurement covers a wide pseudorapidity range from −3.5 to 5, which is sufficient for reliable estimates of the total number of charged particles produced in the collisions. For the most central (0–5%) collisions we find 21400±1300 , while for the most peripheral (80–90%) we find 230±38 . This corresponds to an increase of (27±4)% over the results at sNN=2.76 TeV previously reported by ALICE. The energy dependence of the total number of charged particles produced in heavy-ion collisions is found to obey a modified power-law like behaviour. The charged-particle pseudorapidity density of the most central collisions is compared to model calculations — none of which fully describes the measured distribution. We also present an estimate of the rapidity density of charged particles. The width of that distribution is found to exhibit a remarkable proportionality to the beam rapidity, independent of the collision energy from the top SPS to LHC energies.

Note:

18 pages, 6 captioned figures, authors from page 13, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3337

rapidity: density
charged particle: multiplicity
energy dependence
impact parameter
phase space
factorization
scaling
transverse momentum: momentum spectrum
model: hydrodynamics
Glauber

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