Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at √sNN=2.76 TeV
Author(s)
Apyan, Aram; 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; Krajczar, Krisztian F.; Li, W.; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Wolf, Roger; Wyslouch, Boleslaw; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Ma, Teng; Roland, Christof E; Rudolph, Matthew Scott; Stoeckli, Fabian; Sung, Kevin Kai Hong; Wenger, Edward Allen; Yang, Mingming; Bauer, Gerry P; Luckey Jr, P David; Roland, Gunther M; Sumorok, Konstanty C; Xie, Si; ... Show more Show less
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First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of [√ over s[subscript NN]]=2.76 TeV are presented. The amplitudes of the second Fourier component (v[subscript 2]) of the π[superscript 0] azimuthal distributions are extracted using an event-plane technique. The values of v[subscript 2] are studied as a function of the neutral pion transverse momentum (p[subscript T]) for different classes of collision centrality in the kinematic range 1.6<p[subscript T]<8.0 GeV/c, within the pseudorapidity interval |η|<0.8. The CMS measurements of v[susbcript 2](p[subscript T]) are similar to previously reported π[superscript 0] azimuthal anisotropy results from [√ over s[subscript NN]=200 GeV Au-Au collisions at RHIC, despite a factor of ∼14 increase in the center-of-mass energy. In the momentum range 2.5<p[subscript T]<5.0 GeV/c, the neutral pion anisotropies are found to be smaller than those observed by CMS for inclusive charged particles.
Date issued
2013-01Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Chatrchyan, S. et al. “Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at sqrt[s_{NN}]=2.76 TeV.” Physical Review Letters 110.4 (2013).
Version: Final published version
ISSN
0031-9007
1079-7114