Multiplicity and transverse momentum dependence of two- and four-particle correlations in pPb and PbPb collisions
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Author(s)
CMS Collaboration
Apyan, Aram
Bauer, Gerry P
Busza, Wit
Cali, Ivan Amos
Di Matteo, Leonardo
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Klute, Markus
Date Issued
June 2013
Journal
Physics Letters B
Publisher
Elsevier
Citation
Chatrchyan, S. et al. “Multiplicity and Transverse Momentum Dependence of Two- and Four-Particle Correlations in pPb and PbPb Collisions.” Physics Letters B 724, 4–5 (July 2013): 213–240 © 2013 CERN
Version
Final published version
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 31nb ⁻¹, 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 (|δφ|≈0) associated pair yields and the azimuthal anisotropy Fourier harmonics (v[subscript n]). The second-order (v₂) and third-order (v₃) anisotropy harmonics are extracted using the two-particle azimuthal correlation technique. A four-particle correlation method is also applied to obtain the value of v₂ 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 v₂, and the v₃ become apparent at about the same multiplicity. A remarkable similarity in the v₃ 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. Keywords: CMS; Physics; Heavy ions
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Attribution 3.0 Unported (CC BY 3.0)
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2013.06.028
