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Multiplicity and transverse-momentum dependence of two- and four-particle correlations in pPb and PbPb collisions

Abstract : Measurements of two- and four-particle angular correlations for charged particles emitted in pPb collisions are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 31 inverse nanobarns, were collected during the 2013 LHC pPb run at a nucleon-nucleon center-of-mass energy of 5.02 TeV by the CMS experiment. The results are compared to 2.76 TeV semi-peripheral PbPb collision data, collected during the 2011 PbPb run, covering a similar range of particle multiplicities. The observed correlations are characterized by the near-side (abs(Delta(phi)~0) associated pair yields and the azimuthal anisotropy Fourier harmonics (v[n]). The second-order (v[2]) and third-order (v[3]) anisotropy harmonics are extracted using the two-particle azimuthal correlation technique. A four-particle correlation method is also applied to obtain the value of v[2] and further explore the multi-particle nature of the correlations. Both associated pair yields and anisotropy harmonics are studied as a function of particle multiplicity and transverse momentum. The associated pair yields, the four-particle v[2], and the v[3] become apparent at about the same multiplicity. A remarkable similarity in the v[3] signal as a function of multiplicity is observed between the pPb and PbPb systems. Predictions based on the color glass condensate and hydrodynamic models are compared to the experimental results.
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Contributor : Sylvie Flores Connect in order to contact the contributor
Submitted on : Monday, May 6, 2013 - 10:22:34 AM
Last modification on : Monday, December 13, 2021 - 9:15:06 AM

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S. Chatrchyan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Multiplicity and transverse-momentum dependence of two- and four-particle correlations in pPb and PbPb collisions. Physics Letters B, Elsevier, 2013, 724, pp.213-240. ⟨10.1016/j.physletb.2013.06.028⟩. ⟨in2p3-00820574⟩



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