Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at \sqrt(s_NN)=2.76 TeV

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2.76 TeV
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The elliptic, v2, triangular, v3, and quadrangular, v4, flow coefficients are measured for unidentified charged particles, pions and (anti-)protons in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle correlation methods are reported for the pseudo-rapidity range |eta|<0.8 at different collision centralities and as a function of transverse momentum, pt, out to pt=20 GeV/c. The observed non-zero elliptic and triangular flow depends only weakly on transverse momentum for pt>8 GeV/c. The small pt dependence of the difference between elliptic flow results obtained from two- and four-particle cumulant methods suggests a common origin of flow fluctuations up to pt=8 GeV/c. The magnitude of the (anti-)proton elliptic and triangular flow is larger than that of pions out to at least pt=8 GeV/c indicating that the particle type dependence persists out to high pt.

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