Multiplicity and transverse momentum dependence of two- and four-particle correlations in pPb and PbPb collisions
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; Lai, Yue Shi; Levin, Amy Elizabeth; Luckey Jr, P David; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E; Roland, Gunther M; Stephans, George S. F.; Stoeckli, Fabian; Sumorok, Konstanty C; Velicanu, Dragos Alexandru; Wolf, Roger; Wyslouch, Boleslaw; Yang, Ming; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Wyslouch, Victoria; Chan, M.; Kim, Y.; ... Show more Show less
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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
Date issued
2013-06Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
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
ISSN
0370-2693