Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at $\sqrt{s_{\mathrm {NN}}}=2.76$ TeV with the ATLAS detector - INSPIRE

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Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at $\sqrt{s_{\mathrm {NN}}}=2.76$ TeV with the ATLAS detector

ATLAS

Collaboration

Aug 19, 2014

17 pages

Published in:

Eur.Phys.J.C 74 (2014) 11, 3157

Published: Nov 26, 2014

e-Print:

1408.4342 [hep-ex]

DOI:

10.1140/epjc/s10052-014-3157-z

Report number:

CERN-PH-EP-2014-171

Experiments:

CERN-LHC-ATLAS

View in:

reference search115 citations

Citations per year

Abstract: (Springer)

ATLAS measurements of the azimuthal anisotropy in lead–lead collisions at

\sqrt{s_{\mathrm {NN}}}=2.76

TeV are shown using a dataset of approximately 7 \upmu b

^{-1}

collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta

0.5<p_{\mathrm {T}}<20

GeV and in the pseudorapidity range

|\eta |<2.5

. The anisotropy is characterized by the Fourier coefficients,

\mathrm {v}_n

, of the charged-particle azimuthal angle distribution for

n = 2

–4. The Fourier coefficients are evaluated using multi-particle cumulants calculated with the generating function method. Results on the transverse momentum, pseudorapidity and centrality dependence of the

\mathrm {v}_n

coefficients are presented. The elliptic flow,

\mathrm {v}_2

, is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients,

\mathrm {v}_3

and

\mathrm {v}_4

, are determined with two- and four-particle cumulants. Flow harmonics

\mathrm {v}_n

measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to

\mathrm {v}_n

measurements obtained using different analysis methods and previously reported by the LHC experiments is also shown. Results of measurements of flow fluctuations evaluated with multi-particle cumulants are shown as a function of transverse momentum and the collision centrality. Models of the initial spatial geometry and its fluctuations fail to describe the flow fluctuations measurements.

Note:

17 pages plus author list + cover pages (31 pages total), 14 figures, 2 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2012-04/

flow: fluctuation
angular distribution: anisotropy
transverse momentum dependence
charged particle: multiple production
CERN LHC Coll
rapidity dependence
ATLAS
elliptic flow
higher-order
heavy ion: scattering

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