CMS-HIN-11-009

CMS-HIN-11-009 ; CERN-PH-EP-2012-231
Measurement of the azimuthal anisotropy of neutral pions in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV
CMS Collaboration
13 August 2012
Phys. Rev. Lett. 110 (2013) 042301
Abstract: First measurements of the azimuthal anisotropy of neutral pions produced in PbPb collisions at a center-of-mass energy of $\sqrt{s_{NN}}$ = 2.76 TeV are presented. The amplitudes of the second Fourier component ( $v_2$ ) of the neutral pion 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, within the pseudorapidity interval \| $\eta$ \| < 0.8. The CMS measurements of $v_2(p_T)$ are similar to previously reported neutral pion azimuthal anisotropy results from $\sqrt{s_{NN}}$ = 200 GeV AuAu collisions at RHIC, despite a factor of about 14 increase in the center-of-mass energy. In the momentum range 2.5 < $p_T$ < 5.0 GeV, the neutral pion anisotropies are found to be smaller than those observed by CMS for inclusive charged particles.
Links: e-print arXiv:1208.2470 [nucl-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; CADI line (restricted) ;

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