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    Centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at √ s N N = 5.02  TeV.

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    Authors
    ALICE Collaboration
    Barnby, Lee cc
    Affiliation
    University of Birmingham
    Issue Date
    2016-06-03
    
    Metadata
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    Abstract
    The pseudorapidity density of charged particles, d N ch / d η , at midrapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of √ s N N = 5.02     TeV . For the 5% most central collisions, we measure a value of 1943 ± 54 . The rise in d N ch / d η as a function of √ s N N is steeper than that observed in proton-proton collisions and follows the trend established by measurements at lower energy. The increase of d N ch / d η as a function of the average number of participant nucleons, ⟨ N part ⟩ , calculated in a Glauber model, is compared with the previous measurement at √ s N N = 2.76     TeV . A constant factor of about 1.2 describes the increase in d N ch / d η from √ s N N = 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.
    Citation
    Alice Collaboration (2016) 'Centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at √ s N N = 5.02 TeV.', Physical Review Letters, 116, 222302
    Publisher
    APS Physics
    Journal
    Physical Review Letters
    URI
    http://hdl.handle.net/10545/622335
    DOI
    10.1103/PhysRevLett.116.222302
    Additional Links
    https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.222302
    Type
    Article
    Language
    en
    ISSN
    00319007
    EISSN
    10797114
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevLett.116.222302
    Scopus Count
    Collections
    Department of Electronics, Computing & Maths

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