Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at √sNN=2.76 TeV

• Main Authors: Bauer, Gerry P. (Contributor), Apyan, Aram (Contributor), Bendavid, Joshua L. (Contributor), Busza, Wit (Contributor), Butz, Erik M. (Contributor), Cali, Ivan Amos (Contributor), Chan, M. (Contributor), Dutta, Valentina (Contributor), Gomez-Ceballos, Guillelmo (Contributor), Goncharov, Maxim (Contributor), Hahn, Kristian Allan (Contributor), Kim, Y. (Contributor), Klute, Markus (Contributor), Krajczar, Krisztian F. (Contributor), Li, W. (Contributor), Luckey, P. David, Jr (Contributor), Ma, T. (Contributor), Nahn, Steven (Contributor), Paus, Christoph M. E. (Contributor), Ralph, Duncan Kelley (Contributor), Roland, Christof E. (Contributor), Roland, Gunther M. (Contributor), Rudolph, M. (Contributor), Stephans, George S. F. (Contributor), Stockli, F. (Contributor), Sumorok, Konstanty C. (Contributor), Sung, K. (Contributor), Velicanu, Dragos Alexandru (Contributor), Wenger, E. A. (Contributor), Wolf, Roger (Contributor), Wyslouch, Boleslaw (Contributor), Xie, S. (Contributor), Yang, M. (Contributor), Yilmaz, Yetkin (Contributor), Yoon, A. S. (Contributor), Zanetti, Marco (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor), Massachusetts Institute of Technology. School of Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2013-04-11T15:41:16Z.
• Subjects: Article
• Online Access: Get fulltext

 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.