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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at sNN =5.02 TeV

Author

  • J. Adam
  • D. Adamova
  • M.M Aggarwal
  • G Aglieri Rinella
  • M. Agnello
  • N Agrawal
  • Peter Christiansen
  • Martin Ljunggren
  • Anders Oskarsson
  • Tuva Richert
  • David Silvermyr
  • Carsten Sogaard
  • Evert Stenlund
  • Vytautas Vislavicius
Show all

Summary, in English

The pseudorapidity density of charged particles, dNch/dη, at midrapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of sNN=5.02 TeV. For the 5% most central collisions, we measure a value of 1943±54. The rise in dNch/dη as a function of sNN is steeper than that observed in proton-proton collisions and follows the trend established by measurements at lower energy. The increase of dNch/dη as a function of the average number of participant nucleons, Npart, calculated in a Glauber model, is compared with the previous measurement at sNN=2.76 TeV. A constant factor of about 1.2 describes the increase in dNch/dη from sNN=2.76 to 5.02 TeV for all centrality classes, within the measured range of 0%-80% centrality. The results are also compared to models based on different mechanisms for particle production in nuclear collisions. © 2016 CERN. © 2016 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the »http://creativecommons.org/licenses/by/3.0/» Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Department/s

  • Particle and nuclear physics

Publishing year

2016

Language

English

Publication/Series

Physical Review Letters

Volume

116

Issue

22

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

  • High energy physics
  • Lead
  • Tellurium compounds
  • Charged particle multiplicities
  • Constant factors
  • Different mechanisms
  • Nuclear collisions
  • Particle production
  • Pb-Pb collisions
  • Proton proton collisions
  • Pseudorapidities
  • Charged particles

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114