ATLAS, Collaboration; Agustoni, Marco; Ancu, Lucian; Battaglia, Andreas; Beck, Hans Peter; Borer, Claudia; Cervelli, Alberto; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Marti, Lukas; Pretzl, KlausPeter; Schneider, Basil; Sciacca, Gianfranco; Weber, Michael (2013). Measurement of the distributions of eventbyevent flow harmonics in leadlead collisions at = 2.76 TeV with the ATLAS detector at the LHC. Journal of High Energy Physics, 2013(11), p. 183. Springer 10.1007/JHEP11(2013)183

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The distributions of eventbyevent harmonic flow coefficients v_n for n=24 are measured in sqrt(s_NN)=2.76 TeV Pb+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using charged particles with transverse momentum pT> 0.5 GeV and in the pseudorapidity range eta<2.5 in a dataset of approximately 7 ub^1 recorded in 2010. The shapes of the v_n distributions are described by a twodimensional Gaussian function for the underlying flow vector in central collisions for v_2 and over most of the measured centrality range for v_3 and v_4. Significant deviations from this function are observed for v_2 in midcentral and peripheral collisions, and a small deviation is observed for v_3 in midcentral collisions. It is shown that the commonly used multiparticle cumulants are insensitive to the deviations for v_2. The v_n distributions are also measured independently for charged particles with 0.5<pT<1 GeV and pT>1 GeV. When these distributions are rescaled to the same mean values, the adjusted shapes are found to be nearly the same for these two pT ranges. The v_n distributions are compared with the eccentricity distributions from two models for the initial collision geometry: a Glauber model and a model that includes corrections to the initial geometry due to gluon saturation effects. Both models fail to describe the experimental data consistently over most of the measured centrality range.
Item Type: 
Journal Article (Original Article) 

Division/Institute: 
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 
UniBE Contributor: 
Agustoni, Marco; Ancu, Lucian; Battaglia, Andreas; Beck, Hans Peter; Borer, Claudia; Cervelli, Alberto; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kruker, Tobias; Marti, Lukas; Pretzl, KlausPeter; Schneider, Basil; Sciacca, Gianfranco and Weber, Michael 
Subjects: 
500 Science > 530 Physics 
ISSN: 
10298479 
Publisher: 
Springer 
Language: 
English 
Submitter: 
Andrea Stettler 
Date Deposited: 
05 Sep 2014 08:48 
Last Modified: 
09 Oct 2019 16:18 
Publisher DOI: 
10.1007/JHEP11(2013)183 
Web of Science ID: 
000328332400001 
ArXiv ID: 
1305.2942v2 
Additional Information: 
Kollaboration  Es sind nur die Berner Autoren namentlich erwähnt. 
BORIS DOI: 
10.7892/boris.58393 
URI: 
https://boris.unibe.ch/id/eprint/58393 