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

doi:10.1140/epjc/s10052-014-3157-z

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

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

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punktacja MNiSW [2014 A]: 35

title:	Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV with the ATLAS detector
author:	Pałka Marek
contributor:	Współautorami artykułu są członkowie ATLAS Collaboration w liczbie 2887
institution:	ATLAS Collaboration
journal title:	The European Physical Journal. C, Particles and Fields
volume:	74
issue:	11
date of publication :	2014
article ID:	3157
ISSN:	1434-6044
eISSN:	1434-6052
DOI:	10.1140/epjc/s10052-014-3157-z
language:	English
journal language:	English
abstract in English:	ATLAS measurements of the azimuthal anisotropy in lead–lead collisions at $\sqrt{s_{NN}}=2.76$ TeV are shown using a dataset of approximately $7 \mu b^{-1}$ are shown using a dataset of approximately 7 < $p_{T}$ < 20 GeV and in the pseudorapidity range $\left \| \eta \right \|<2.5$. The anisotropy is characterized by the Fourier coefficients, $v_{n}$, 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 $v_{n}$ coefficients are presented. The elliptic flow, $v_{n}$, is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients, $v_{3}$ and $v_{4}$, are determined with two- and four-particle cumulants. Flow harmonics $v_{n}$ measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to $v_{n}$ 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.
number of pulisher's sheets:	2
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper