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

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

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 u...

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Bibliographic Details
Main Authors: 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
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Physical Society 2013
Online Access:http://hdl.handle.net/1721.1/78344
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-0869-5631
Description
Summary: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.

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