Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV - INSPIRE

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Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at $\sqrt{s_{NN}}$ =2.76 TeV

ALICE

Collaboration

May, 2011

10 pages

Published in:

Phys.Rev.Lett. 107 (2011) 032301

e-Print:

1105.3865 [nucl-ex]

DOI:

10.1103/PhysRevLett.107.032301

Report number:

CERN-PH-EP-2011-073

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (arXiv)

We report on the first measurement of the triangular

v_3

, quadrangular

v_4

, and pentagonal

v_5

charged particle flow in Pb-Pb collisions at 2.76 TeV measured with the ALICE detector at the CERN Large Hadron Collider. We show that the triangular flow can be described in terms of the initial spatial anisotropy and its fluctuations, which provides strong constraints on its origin. In the most central events, where the elliptic flow

v_2

and

v_3

have similar magnitude, a double peaked structure in the two-particle azimuthal correlations is observed, which is often interpreted as a Mach cone response to fast partons. We show that this structure can be naturally explained from the measured anisotropic flow Fourier coefficients.

Note:

10 pages, 4 figures, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3879

05.70.Fh
25.75.Gz
25.75.Ld
flow: anisotropy
angular correlation: two-particle
lead
charged particle
CERN LHC Coll
elliptic flow
particle flow

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