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Measurement of the elliptic anisotropy of charged particles produced in PbPb collisions at √sNN=2.76 TeV

Author(s)
Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Kim, Y.; Klute, Markus; Lee, Yen-Jie; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Rudolph, Matthew Scott; Stephans, George S. F.; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wolf, Roger; Wyslouch, Boleslaw; Xie, Si; Yang, Mingming; Yilmaz, Yetkin; Zanetti, Marco; Ralph, Duncan Kelley; Roland, Christof E; Roland, Gunther M; Stoeckli, Fabian; Sumorok, Konstanty C; Sung, Kevin Kai Hong; Yoon, A. S.; Bauer, Gerry P; Li, W.; Luckey Jr, P David; ... Show more Show less
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Abstract
The anisotropy of the azimuthal distributions of charged particles produced in [√ over s[subscript NN]]=2.76 TeV PbPb collisions is studied with the CMS experiment at the LHC. The elliptic anisotropy parameter, v[subscript 2], defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method, two- and four-particle cumulants, and Lee-Yang zeros. The anisotropy is presented as a function of transverse momentum (p[subscript T]), pseudorapidity (η) over a broad kinematic range, 0.3<p[subscript T]<20 GeV/c, |η|<2.4, and in 12 classes of collision centrality from 0 to 80%. The results are compared to those obtained at lower center-of-mass energies, and various scaling behaviors are examined. When scaled by the geometric eccentricity of the collision zone, the elliptic anisotropy is found to obey a universal scaling with the transverse particle density for different collision systems and center-of-mass energies.
Date issued
2013-01
URI
http://hdl.handle.net/1721.1/78554
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review C
Publisher
American Physical Society
Citation
Chatrchyan, S. et al. “Measurement of the Elliptic Anisotropy of Charged Particles Produced in PbPb Collisions at sqrt[s_{NN}]=2.76 TeV.” Physical Review C 87.1 (2013).
Version: Final published version
ISSN
0556-2813
1089-490X

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