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    Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies

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    Author
    CMS Collaboration; Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; More... Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. Less...
    Date
    2015
    Abstract
    Measurements of two-particle angular correlations between an identified strange hadron (KS0 or Λ/Λ¯) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 nb−1, were collected at a nucleon–nucleon center-of-mass energy (√sNN) of 5.02 TeV with the CMS detector at the LHC. The results are compared to semi-peripheral PbPb collision data at √sNN=2.76 TeV, covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order (v2) and third-order (v3) anisotropy harmonics of View the MathML sourceKS0 and Λ/Λ¯ particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v2 and v3 is observed. For pT<2 GeV, the v2 and v3 values of KS0 particles are larger than those of Λ/Λ¯ particles at the same pT. This splitting effect between two particle species is found to be stronger in pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both v2 and v3 for KS0 particles are observed to be consistent with those for Λ/Λ¯ particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities.
    Citation
    CMS Collaboration, Adair, A., Akgun, B., et al.. "Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies." Physics Letters B, 742, (2015) Elsevier: 200-224. http://dx.doi.org/10.1016/j.physletb.2015.01.034.
    Published Version
    http://dx.doi.org/10.1016/j.physletb.2015.01.034
    Keyword
    CMS; ridge; long-range; correlations; flow; More... high-multiplicity Less...
    Type
    Journal article
    Publisher
    Elsevier
    Citable link to this page
    https://hdl.handle.net/1911/79478
    Rights
    This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
    Link to License
    https://creativecommons.org/licenses/by/4.0/
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    • Faculty Publications [4918]
    • Physics and Astronomy Publications [1744]

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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map