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Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at √s(NN)=2.76 TeV
Baringer, Philip S. Bean, Alice Benelli, Gabriele Kenny, R. P., III Murray, Michael J. Noonan, Danny Sanders, Stephen J. Stringer, Robert W. Tinti, Gemma Wood, Jeffrey Scott
Baringer, Philip S.
Bean, Alice
Benelli, Gabriele
Kenny, R. P., III
Murray, Michael J.
Noonan, Danny
Sanders, Stephen J.
Stringer, Robert W.
Tinti, Gemma
Wood, Jeffrey Scott
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Abstract
First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of √s(NN)=2.76 TeV are presented. The amplitudes of the second Fourier component (v(2)) of the π(0) azimuthal distributions are extracted using an event-plane technique. The values of v(2) are studied as a function of the neutral pion transverse momentum (p(T)) for different classes of collision centrality in the kinematic range 1.6<p(T)<8.0 GeV/c, within the pseudorapidity interval |η|<0.8. The CMS measurements of v(2)(p(T)) 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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This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.042301.
Date
2013-01-22
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American Physical Society
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Citation
S. Chatrchyan et al. (CMS Collaboration). (2013). "Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at √s(NN)=2.76 TeV." Physical Review Letters, 110(4):042301. http://dx.doi.org/10.1103/PhysRevLett.110.042301.