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Measurement of the azimuthal anisotropy of neutral pions in PbPb collisions at \sqrt{s} = 2.76 TeV


CMS Collaboration; Chatrchyan, S; Khachatryan, V; Sirunyan, A M; Tumasyan, A; Amsler, C; Chiochia, V; De Visscher, S; Favaro, C; Ivova Rikova, M; Millan Mejias, B; Otiougova, P; Robmann, P; Snoek, H; Tupputi, S; Verzetti, M (2012). Measurement of the azimuthal anisotropy of neutral pions in PbPb collisions at \sqrt{s} = 2.76 TeV. Physical Review Letters, 110(4):042301.

Abstract

First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of √sNN=2.76  TeV are presented. The amplitudes of the second Fourier component (v2) of the π0 azimuthal distributions are extracted using an event-plane technique. The values of v2 are studied as a function of the neutral pion transverse momentum (pT) for different classes of collision centrality in the kinematic range 1.6<pT<8.0  GeV/c, within the pseudorapidity interval |η|<0.8. The CMS measurements of v2(pT) are similar to previously reported π0 azimuthal anisotropy results from √sNN=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<pT<5.0  GeV/c, the neutral pion anisotropies are found to be smaller than those observed by CMS for inclusive charged particles.

Abstract

First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of √sNN=2.76  TeV are presented. The amplitudes of the second Fourier component (v2) of the π0 azimuthal distributions are extracted using an event-plane technique. The values of v2 are studied as a function of the neutral pion transverse momentum (pT) for different classes of collision centrality in the kinematic range 1.6<pT<8.0  GeV/c, within the pseudorapidity interval |η|<0.8. The CMS measurements of v2(pT) are similar to previously reported π0 azimuthal anisotropy results from √sNN=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<pT<5.0  GeV/c, the neutral pion anisotropies are found to be smaller than those observed by CMS for inclusive charged particles.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2012
Deposited On:07 Mar 2013 15:33
Last Modified:07 Dec 2017 20:34
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.110.042301

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