Measurement of Flow Harmonics with Multi-Particle Cumulants in Pb + Pb Collisions at √{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 √{S_{NN}} = 2.76 TeV with the ATLAS Detector

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Title: Measurement of Flow Harmonics with Multi-Particle Cumulants in Pb + Pb Collisions at √{S_{NN}} = 2.76 TeV with the ATLAS Detector
Author(s):
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdel Khalek, S.;
Abdinov, O.;
Aben, R.;
Abi, B.;
Izen, Joseph M.;
Leyton, Michael;
Lou, Xinchou;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2014-11-26
Format: Text
Item Type: Article
Keywords: Show Keywords
Abstract: ATLAS measurements of the azimuthal anisotropy in lead-lead collisions at √sNN = 2.76 TeV are shown using a dataset of approximately 7 μb⁻¹ collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta 0.5 < p_T < 20 GeV and in the pseudorapidity range |η| < 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, v₂, is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients, v₃ and v₄, 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 multiparticle 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.
Publisher: Springer
ISSN: 1434-6044
Source: European Physical Journal C
Link to Related Resource: http://dx.doi.org/10.1140/epjc/s10052-014-3157-z
Persistent Link: http://hdl.handle.net/10735.1/4366
Bibliographic Citation: Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, et al. 2014. "Measurement of flow harmonics with multi-particle cumulants in Pb + Pb collisions at √{S_{NN}} = 2.76 TeV with the ATLAS detector." European Physical Journal C 74(3157), doi:10.1140/epjc/s10052-014-3157-z.
Terms of Use: CC BY 4.0 (Attribution)
©2014 CERN, for the ATLAS Collaboration

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CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)