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    Multi-strange baryon production in p–Pb collisions at √sNN = 5.02 TeV.

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    Authors
    ALICE Collaboration
    Barnby, Lee cc
    Affiliation
    University of Birmingham
    Issue Date
    2016-05-12
    
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    Abstract
    The multi-strange baryon yields in Pb–Pb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, and production rates have been measured with the ALICE experiment as a function of transverse momentum, pT, in p–Pb collisions at a centre-of-mass energy of √sNN = 5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c < pT < 7.2 GeV/c and 0.8 GeV/c < pT < 5 GeV/c, for and respectively, in the common rapidity interval −0.5 < yCMS < 0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The pT spectra are analysed as a function of event charged-particle multiplicity, which in p–Pb collisions ranges over one order of magnitude and lies between those observed in pp and Pb–Pb collisions. The measured pT distributions are compared to the expectations from a Blast-Wave model. The parameters which describe the production of lighter hadron species also describe the hyperon spectra in high multiplicity p–Pb collisions. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pb–Pb collisions. A continuous increase in the yield ratios as a function of multiplicity is observed in p–Pb data, the values of which range from those measured in minimum bias pp to the ones in Pb–Pb collisions. A statistical model qualitatively describes this multiplicity dependence using a canonical suppression mechanism, in which the small volume causes a relative reduction of hadron production dependent on the strangeness content of the hyperon.
    Citation
    Alice Collaboration (2016) 'Multi-strange baryon production in p–Pb collisions at √sNN = 5.02 TeV.', Physics Letters B, Vol. 758, July, pp. 389-401.
    Publisher
    Elsevier
    Journal
    Physics Letters B
    URI
    http://hdl.handle.net/10545/622336
    DOI
    10.1016/j.physletb.2016.05.027
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0370269316301745?via%3Dihub
    Type
    Article
    Language
    en
    ISSN
    03702693
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.physletb.2016.05.027
    Scopus Count
    Collections
    Department of Electronics, Computing & Maths

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