Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at √sNN=5.02TeV

Media type: E-Article

Title: Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at √sNN=5.02TeV

Contributor: Acharya, Shreyasi [Author]; Angelov, Venelin [Author]; Arslandok, Mesut [Author]; Danisch, Meike [Author]; Deisting, Alexander [Author]; Glässel, Peter [Author]; Kim, Jiyoung [Author]; Klewin, Sebastian [Author]; Leardini, Lucia [Author]; Mercado Pérez, Jorge [Author]; Oeschler, Helmut [Author]; Ohlson, Alice [Author]; Pachmayer, Yvonne C. [Author]; Reygers, Klaus [Author]; Schicker, Rainer [Author]; Schmidt, Marten Ole [Author]; Stachel, Johanna [Author]; Weiser, Dennis [Author]; Wilkinson, Jeremy [Author]; Windelband, Bernd [Author]; Zimmermann, Alice [Author]

Published: 14 July 2017

Language: English

DOI: 10.1016/j.physletb.2017.07.017

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Footnote: Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt
ALICE Collaboration: S. Acharya, V. Anguelov, M. Arslandok, M.C. Danisch, A. Deisting, P. Glässel, J. Kim, S. Klewin, L. Leardini, J. Mercado Pérez, H. Oeschler, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, M.O. Schmidt, J. Stachel, D.F. Weiser, J. Wilkinson, B. Windelband, A. Zimmermann [und weitere]
NN unter s tiefgestellt

Description: 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.

Access State: Open Access

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