DMeson Elliptic Flow in Noncentral Pb-Pb Collisions at ffiffiffiffiffiffiffiffi sNN p 1⁄4 2:76 TeV

B. Abelev et al.* (ALICE Collaboration) (Received 14 May 2013; published 5 September 2013) Azimuthally anisotropic distributions of D, Dþ, and D þ mesons were studied in the central rapidity region (jyj< 0:8) in Pb-Pb collisions at a center-of-mass energy ffiffiffiffiffiffiffiffi sNN p 1⁄4 2:76 TeV per nucleon-nucleon collision, with the ALICE detector at the LHC. The second Fourier coefficient v2 (commonly denoted elliptic flow) was measured in the centrality class 30%–50% as a function of the D meson transverse momentum pT , in the range 2–16 GeV=c. The measured v2 of D mesons is comparable in magnitude to that of light-flavor hadrons. It is positive in the range 2< pT < 6 GeV=cwith 5:7 significance, based on the combination of statistical and systematic uncertainties.