Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at √s(NN)=2.76 TeV
Baringer, Philip S.
Kenny, R. P., III
Murray, Michael J.
Sanders, Stephen J.
Stringer, Robert W.
Wood, Jeffrey Scott
Sirunyan, A. M.
American Physical Society
Scholarly/refereed, publisher version
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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 √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.
This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.042301.
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.
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