Evidence for Collective Multiparticle Correlations in p-Pb Collisions
Name
Khachatryan-2015-Evidence for collective.pdf
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Author(s)
Apyan, Aram
Barbieri, Richard Alexander
Bierwagen, Katharina
Busza, Wit
Cali, Ivan Amos
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Klute, Markus
Date Issued
June 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Ero, et al. “Evidence for Collective Multiparticle Correlations in p−Pb Collisions.” Physical Review Letters 115, no. 1 (June 2015). © 2015 CERN, for the CMS Collaboration
Version
Final published version
Abstract
The second-order azimuthal anisotropy Fourier harmonics, v[subscript 2], are obtained in p−Pb and PbPb collisions over a wide pseudorapidity (η) range based on correlations among six or more charged particles. The p-Pb data, corresponding to an integrated luminosity of 35 nb[superscript −1], were collected during the 2013 LHC p-Pb run at a nucleon-nucleon center-of-mass energy of 5.02 TeV by the CMS experiment. A sample of semiperipheral PbPb collision data at √s[subscript NN] = 2.76 TeV, corresponding to an integrated luminosity of 2.5 μb[superscript −1] and covering a similar range of particle multiplicities as the p−Pb data, is also analyzed for comparison. The six- and eight-particle cumulant and the Lee-Yang zeros methods are used to extract the v[subscript 2] coefficients, extending previous studies of two- and four-particle correlations. For both the p−Pb and PbPb systems, the v[subscript 2] values obtained with correlations among more than four particles are consistent with previously published four-particle results. These data support the interpretation of a collective origin for the previously observed long-range (large Δ[subscript η]) correlations in both systems. The ratios of v[subscript 2] values corresponding to correlations including different numbers of particles are compared to theoretical predictions that assume a hydrodynamic behavior of a p−Pb system dominated by fluctuations in the positions of participant nucleons. These results provide new insights into the multiparticle dynamics of collision systems with a very small overlapping region.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.115.012301
